Friday, December 6, 2013

History of tea cultivation



 

Tea drinking originated in China and the word tea is derived from t'e of the Chinese Fukien dialect. The Dutch introduced it to Europe. In Cantonese, tea is known as Ch'a and this is the name by which this wonderful beverage came to be known in Japan, India, Russia, Iran and the Middle East. The first authentic reference to tea was made in an ancient Chinese dictionary revised by Kuo P'o, a celebrated Chinese scholar in AD 350. At that time a medicinal decoction was made by boiling tea leaves. Use of tea as a beverage commenced towards the close of the sixth century. During the two succeeding centuries tea gained enormous popularity. The first exclusive book on tea, Ch'a Ching meaning 'Tea classic' by the Chinese tea expert Lu Yu was published in AD 780 in which he has described various kinds of tea, their cultivation and manufacturing in China.
 

 
 
However, apart from Japan, tea drinking did not spread to other parts of the world until about the middle of the seventeenth century. The opening of a sea route to India and the East by the Portuguese in 1497 facilitated large-scale trading between Europe and the Oriental countries. Other European nations soon followed the Portuguese in establishing trade centres in different countries of the East. The Dutch in Java established one such depot. They bought tea from Japan and the first consignment was transhipped from Java to Europe in 1610. This marked the beginning of the lucrative tea trade between Europe and the East. The Dutch dominated the tea trade for more than a century finally yielding to the British. China was the sole supplier of tea to Europe till the middle of the nineteenth century.
Tea gained a strong foothold among the affluent sections in Europe within 50 years of its first introduction into the continent. In about another 100 years it became an article of daily use in a large part of Europe and Britain. Tea also became popular in America, which was then a British colony.
Discovery of the Assam Tea Plant
The discovery of the Assam tea plant is attributed to Robert Bruce who is supposed to have seen the plant growing wild in some hills near Rangpur (near present Sibsagar), then the capital of Assam, during his visit in 1823 on a trading mission (Ukers, W.H., 1935, All About Tea Vol. I. Tea and Coffee Trade Journal Co., New York). He made an arrangement with a Singphow (a tribe) Chief to supply him some tea plants during his next visit, though it did not materialize due to his death. Instead, his brother, C.A. Bruce, in charge of the British Gunboat division in the war with the Burmese occupying Assam in 1824 and posted at Sadiya met the Singphow Chief who supplied him some tea plants and seeds. Most of these seeds were planted in Bruce's garden at Sadiya and some were sent to Commissioner Jenkins at Gauhati. A few leaves of these plants were sent to Botanical gardens in Calcutta. Dr. N. Wallich, who was then the Superintendent of Botanical Gardens, identified the leaves as belonging to the Camellia family but did not consider them to be of the same species as the China tea plant.
In 1834 the then Governor General of India Lord William Bentinck appointed a Tea Committee to advise on feasibility of commercial tea cultivation in India. The committee issued a circular asking for information on areas suitable for tea cultivation and sent its secretary Mr. G. J. Gordon, to procure tea seeds, plants and workers from China. In response to the circular, the Commissioner of Assam, Major F. Jenkins, made a strong case in favour of tea cultivation in Assam where tea plants were growing wild in forest. He also collected complete specimens of the local plants and forwarded them to the Government Botanical Gardens in Calcutta. On this occasion Dr. Wallich had no difficulty in identifying the specimens as tea, and the plants were not different from the tea plant of China. Upon this, the Tea Committee recommended that the indigenous plant under proper management be cultivated with complete success for commercial purpose.
A scientific commission was constituted in 1835 with Dr. N. Wallich, Dr. W. Griffith and Dr. J. McClelland to report on the Indian indigenous tea plants and to advise on the most favourable localities for starting experimental tea gardens. The Scientific Commission visited Assam in early 1836. Mr. C.A. Bruce, acting as guide, took the members to a number of tracts at the foot of the Naga and Patkai hills as well as to a few in the river valleys where the indigenous tea plant was growing in clumps. Having seen the tea bushes Dr. Wallich expressed the view that there was no need any more to import tea seed from China, while Mr. Griffith favoured import of the China seed because a wild plant is not likely to give as good a produce as one that has been cultivated for centuries. It was finally decided that the China plant and not the degraded Assam plant should be used for the Government experiments. The Commission failed to come to a general agreement regarding the most favourable localities for establishing experimental gardens. Dr. Wallich favoured the Himalayan region while the other two favoured Upper Assam where wild tea existed. So Mr. Gordon was sent again to China in 1836 and for many years China tea seed was imported regularly into India. From these seeds, nurseries were raised in the government Botanical Gardens in Calcutta and the plants were sent to Upper Assam, Dehra Doon, Kumaon and the Nilgiri hills.
The experimental-site at Saikhowa near Sadiya in Upper Assam was not proper where many plants died. The surviving plants were shifted to a new site near Chabua about 25 kilometres east of Dibrugarh. In the Himalayan region, tea seedlings were planted near Bhimtal and Almora. Later on, experimental gardens were successfully established with China plants in Kumaon, Garhwal and Kangra districts on the Himalayan foothills. Of the plants sent to the South, a few survived in Nilgiris and a small lot in Wynaad on the western coast.
Apart from establishing experimental plots of tea with the China plants and seeds, C.A. Bruce who was then appointed as the Superintendent of Government tea plantations, raised nurseries of the indigenous tea plant also. He has also explored a large part of the territory from Sadiya to Gabru Purbat in Upper Assam and discovered numerous tea tracts inside forests. Some of these tea tracts were cleared and the leaves gathered from the bushes were manufactured with the help of workmen brought from China. The first experimental samples of tea from the indigenous plants were sent to Calcutta in 1836. The samples received favourable comments, whereupon an invoice of eight chests of Assam tea was forwarded to London in 1838, which was auctioned on 10 January 1839. This was a momentous occasion because not only did it establish the worth of the Assam tea plant but determined the future course of tea cultivation throughout the world. Today, more tea is made from the Assam type of plants than from the China type.
Mr. C.A. Bruce was awarded the English Society of Arts medal, presented through the Agricultural and Horticultural Society of Bengal, for his contribution in the discovery of Assam tea plant. Major Jenkins and Captain Charlton disputed this decision and staked their claims for the honour. Acrimonious correspondence followed but eventually both of them also received a medal each from the Agricultural and Horticultural Society of Bengal. The only person who did not receive any award was Robert Bruce who is considered to be the real discoverer of the plant. According to some sources (Baildon, 1877, Tea in Assam, Calcutta) the tea plant of Assam was discovered by a local Assamese nobleman Maniram Dewan, who later worked in the Assam Company for some time. It is possible that Maniram Dewan brought the plant to the notice of Robert Bruce during his visit to Rangpur in 1823. The role of the Singphow tribe of Assam in bringing the local plant to the notice of the outside world cannot be ignored. It was a Singphow Chief again who supplied tea plants and seeds to C.A. Bruce. Another Singphow Chief prepared 35 out of the 130 chests of tea, which C.A. Bruce sent to Calcutta in 1841. This clearly shows that the Singphows must have been familiar with the plant and were making and drinking tea from antiquity.

Sunday, November 24, 2013

Sorghum : Sorghum bicolor L. Moench

Introduction
Sorghum is a contender to maize in the provender industry, which dependant up on the grain price in the world market. The International Crop Research Institute for the Semi-Arid Tropics(ICRISAT) in India has developed germplasm which are highly suitable for both food and feed purposes. Poor demand arising from more popularity of other major cereals and high bird damage are the main reasons for less popularity of the crop when both quality and yield are superior in newly improved varieties.

Nutritive value %
Carbohydrate 74.93
Protein 7.57
Fat 3.92
Minerals 2.89
Moisture 9.38
Fibre 1.31
Calary vlaue/100g 365.3

Recommended Varieties
Variety IS 2941       
Year of release 1971

Field establishment
Climate and Soil requirements

Deep, loamy, fertile soils, rich in organic matter, are preferred for satisfactory growth. Well-drained soils with adequate moisture supply are required for uninterrupted growth of this crop.By establishing the crops with the on-set of the rainy season, the crops can be harvested before depletion of soil moisture. They can be planted in maha similarly, as with other major crops that need 3-3 months to mature and a longer rainy season for uninterrupted growth.
Land preparation
Deep ploughing up to 45 cm is favourable for sorghum that have deep growth. Ridges can be made at 60cm apart for sorghum planting. Seeds are planted on ridges to avoid water logging in heavy rainy periods. Sufficient drains are provided to drain off excess water during rainy periods.
Spacing
For sorghum seeds are planted at 60cm x 30cm 2 plants per hill.
Planting material
Seed requirement for planting one hectare of sorghum is 8-10kg
Time of planting
In Maha these crops can be raised as rainfed as well with supplementary irrigation when there are drought periods. Maha crop can be established with Maha rains that occur in latter part of September or first week of October for successful growth. Yala crops should be established with Yala rains that fall in later part of April. By timely cultivation pest problems can be reduced.

Crop management
Weed control
Weeds could be controlled by manual methods such as weeding and application pre- and post emergent weed killers. Crops need to be maintained weed free at least until flowering stage.
Fertilizer application (kg/ha)
Crop Urea Conc. Super Phosphate Muriate of Potash
Sorghum             150 100 50
Irrigation
During dry periods, irrigations are required every 4-7 days depending on the severity of the drought and type of soil.
Diseases and Insect pest control
Root and stalk rots and foliar diseases such as leaf blight and sheath blight are common in humid days & Sorghum is also highly susceptible to rots

Harvesting & post-harvest technology
Harvesting

Crops are harvested, shelled and cleaned manually when grain moisture is low and after physiological maturity is reached. Seed moisture is lowered by sun drying to a safer level before shelling the seeds.
Post harvest technologies & food technologies
As post harvest facilities are yet to develop, except seed that need special attention and storage conditions, commercial grain are disposed as quickly as possible to avoid wastage by pest and diseases. As a result a fair priced to most products. About 75% of maize and sorghum are used in feed production. 

Tuesday, November 19, 2013

Cinnamon

Cinnamomum zeylanicum Blume

Family Lauraceae



History

Cinnamon is the dried bark of the perennial tree of C.zeylanicum of the Lauraceae family. True cinnamon is native to Sri Lanka. Cinnamon is originally grown wild in central hill country of Sri Lanka. The history of cinnamon dates back to about 2800 B.C where it can be found referenced as ”kwai” in Chinese writings. Cinnamon is even mentioned in the Bible when Moses used it as an ingredient for his anointing oil in ancient Rome. It was burned in Roman funerals perhaps partly as a way forward to off the odor of dead bodies. Emperor Nero is said to have burned a years’ worth of the dry supply of cinnamon at the funeral of his wife Poppaea Sabina. Ancient Egyptians used it in embalming mummies because of pleasant odors and its preservative qualities.

Cinnamon was a precious spice in the west during 14th -15th centuries and its’ primary use was to preserve meat and to retard the growth of bacteria.   The quest for cinnamon was a major factor which led to exploration of the world in 15th century. By that time the real cinnamon was produced in only one place, namely in Ceylon or Sri Lanka. Anyone who had the control of the supply flow would have made profits immensely. Portuguese traders made their way to Ceylon in the 15th century, enslaved the natives and had the control of the trade from Arabs. Soon the Dutch displaced the Portuguese and gained the control of the cinnamon monopoly. It was the Dutch who took a massive effort to boost the production by domestication of crop and expanding extent in the areas they had the control. Because of that effort cinnamon cultivations were moved to Western and Southern coastal belts of the island. Since 1815 the British took the control of the island and cinnamon trade too was moved to their hands. By this time the relative importance of spices in the world market had been declining due to the emerging plantation crop sector of tea and rubber, which restricted the further expansion of cinnamon.
The best historical evidence about the cinnamon trade in Sri Lanka is found in Up country-Dutch agreement (Hanguranketha agreement) signed in 14th February 1766 between the Sri Lankan king Sri Keerthi Sri Rajasinghe and the Dutch government.
By this agreement King had permitted the Dutch to cut and peel cinnamon in certain forest areas of Sri Lanka and Dutch agreed to protect the Kingdom from foreign invasion.

Products and Uses

Cinnamon bark is largely available in the form of quills and making quills is unique to Sri Lanka. Quills are made by rolling the pealed bark and join several of them together to get a pipe like structure in the required length. Other than that pieces of bark are available as chips, quillings or featherings. Cinnamon is unique plant which has essential oil in leaves, bark and roots but chemical composition of them are completely different from each other. Essential oils are produced from both bark and leaves; major chemical in bark oil is Cinnamaldehyde and in leaf oil Euginol. Cinnamon is also available in pure ground form or as n ingredient in curry mixtures and pelleted form too.

Cinnamon is mostly used in cooking and baking. Cinnamon is a versatile spice which can be added to any food item such as salads, confectionaries, beverages, soups, stews and sauces. Cinnamon drink made by immersing pieces of bark in hot water is popular among Latin American countries. Cinnamon flavored tea is becoming popular. It is also used as a common ingredient in Chinese ad Aurvedic medicine. Cinnamon leaf and bark oils are used to flavor food products, in perfumery industry and in pharmaceutical industry.

Major Growing Areas

In Sri Lanka, Cinnamon seems to have originated in the central hills where seven wild species of cinnamon occur in Kandy, Matale, Belihull oya, Haputale, Horton planes and the Sinharaja forest range. Presently cultivation concentrated along the coastal belt from Negambo to Matara, it has also made inroads to Kalutara and Ratnapura.

Varieties

There are eight cinnamon species in Sri Lanka. Among them only Cinnamomum zeylanicum Blume is grown commercially. In tradition, there were several types of cinnamon categorized based on taste of the bark. “Pani-Miris Kurundu” was the best with sweet-pungent taste and “Miris Kurundu”, “Sevel Kurundu” and “Thiththa Kurundu” are the others. Currently ten cinnamon accessions have been identified based on yield and quality performances and best two lines, named as “Sri Vijaya” and “Sri Gamunu”, were released. Other selections are under evaluation in different agro climatic zones.

Soils and Climatic needs

Soils
Cinnamon can be grown in various types of soils varying from silver sands in Negambo to loamy and lateritic gravelly soils in Southern costal belt and interior. The bark quality is influenced by soil and climatic factors and the best quality cinnamon is produced in white sandy soil in Negombo area. However, the best grade cinnamon called “Alba” is mainly produced in Red Yellow Podzolic soils in South-western region of Sri Lanka. Cinnamon needs a deep soil but cinnamon roots can penetrate even through the cracks of the parent material to deeper layers.

Climate
Cinnamon is commercially grown in coastal belts in Sri Lanka and spread to interior part of the country where elevation is increased up to about 250 above MSL. Naturally cinnamon has been found in central hilly area of Sri Lanka the elevation increased up to about 500m amsl. Until to date it can be found in  Sinharaja  and Knuckles forest reserve. Wet zone is ideal for the successful growth of cinnamon but it can be grown commercially in Intermediate zones of mid and low country, where annual rainfall is more than 1750mm.  However it is not suitable for areas with prolong dry periods.
Cinnamon is sun loving plant and high sun shine is needed.
The most suitable temperature is between 250C- 320C .
Rainfall should be in the region of 1,750-3,500 mm per annum.

Crop establishment

Planting materials
Cinnamon is usually propagated by seeds in large scale. Vegetative propagation through stem cuttings is feasible. Well ripened seeds are selected, thoroughly washed to remove pericarp and plant in 12.5 x20.0cm poly bags filled with equal parts of top soil, cow dung, sand and coir dust.
Five to eight seeds are planted in a bag but thinning out is done to keep 4-5 vigorous plants after about two months.

Field planting
Spacing - 120cm x 90cm (9000 plants/ha)
Planting is done with the on set of monsoon rains.  Healthy, disease free, four month old seedlings are planted in pits of 30cm x 30cm x 30cm. Planting pit is filled with top soil and cow dung or compost and one bag with 4-5 seedlings is planted in a pit.

Crop management

Fertilizer application
When harvesting the whole cinnamon plant is harvested hence the bush need a high fertilizer dose to rejuvenate a new shoot. Application of chemical fertilizer increases the yield significantly and application of organic fertilizer (cinnamon leaves, compost, poultry manure) too is highly beneficial for successful growth and yield.
Fertilizer recommendation
Recommended fertilizer mixture - 900 kg / ha /yr
Components of the mixture Parts by weight Nutrients in the mixture
Urea (46% N) 2 23% N
Rock phosphate (28% p2O5) 1 7% P2O5
Muriate of potash (60% k2O) 1 15% K20

Age of plantation
Maha Season
(mixture kg/ha)
Yala Season
(mixture kg/ha)
1st Year (six months after planting) 150 150
2nd Year (kg) 300 300
3rd Year and onwards (kg) 450 450
Fertilizer is applied twice a year with the beginning of rains of Yala and Maha. Dolomite is applied, at the rate of 500 to 1000kg / ha /year, in areas where soil pH is below 4.5.

Weeding - Weeding is also an essential operation in cinnamon. Clean weeding is recommended for young plantations and slash weeding is recommended at 2-3 times a year for mature crop.
Soil conservation –In areas where the land is sloppy or undulated, soil conservation reduce the erosion.  Contour trenches at appropriate intervals are recommended.
Plant training and pruning – Training and pruning of plants should be done once in every six months. Excess lateral branches are removed to have a straight and smooth stem and after harvesting weak shoots are removed to enhance the growth of main stems.

Crop Protection

Diseases

Rough Bark Disease: Phomopsis sps.

Rough bark disease is the most common disease of cinnamon which affects on young bark of immature shoots as brown spots and spread gradually throughout the bark. Leaves of the infested plants show clorosis and under severe conditions infected immature plants will die. Diseased bark can not be peeled. Disease can be controlled by destroying diseased plant and through adoption of correct cultural practices. Harvesting should be done at correct intervals and excess lateral branches to be removed. As a chemical treatment 1% Bordeaux mixture or copper based fungicide can be sprayed.

White Root Disease
Causal agent is a fungus known as Fomes noxis. Commonly found in cinnamon planted in lands which previously had rubber cultivations. Yellowing and subsequent shedding of leaves and sudden death of plants are visible symptoms. White colour fungal mycelia growths can be observed on roots of infected plants.
To control the spread of disease dead plants should be uprooted and burned. Root bases should be cleaned. Sulphur powder should be applied to the bases of infected plants and planting holes when new plants are establishing in such lands.
Other minor diseases are leaf blight, Black powdery mildew algae growth on leaves.

Pests
Pink Stem Borer: Ichneumoniptera cf.xanthosoma

Adult moth lays eggs in the bases of the cinnamon plant and caterpillar (larvae) eats in to the plant stem near the soil surface. This pest damage is most common in old plantations with poor crop management. As a result, new shoots may die and some mature shoots collapses from the base. New shoot formation also retarded. At the end gradually bush will die. The damage can successfully be controlled by covering the plant base by earthling up and through proper soil conservation. If the damage is serious, chemicals such as carbofuran and chlorophyrophos can be used.  

Other minor pest problems are cinnamon shoot borer, plant ticks and mites, leaf minor and cinnamon butterfly attacks.

Harvesting and Post Harvest practices

First harvest of cinnamon can be taken after three years of planting and two harvests can be taken per year. Harvesting is done when the bark color of the stem turn in to brown and stick diameter is about 3-5cm diameter. Branches and leaves are removed from harvested sticks before peeling and harvested stems should be peeled on the same day. During peeling outer skin is scraped and rubs the bark with a brass rod to be loosened bark from the hard wood. Then peel the bark, part by part, with a special knife and peeled bark is allowed to dry under sun for few hours and when rolling of the bark starts, pieces of bark are connected together and to make a pipe like structure (called as a quill) and the standard length of the tube is 42 inches. The hollow of the tube is filled with small pieces of stem and the tubes are left for in-door drying for about 4-7 days.
Standard quality specifications
Quality requirements in cinnamon quills

Character
Smell Inherited smell of cinnamon
Colour Light brown to brown
Moisture content 14% for quills and 12% for other products
Volatile oil 1% for quills and 0.7% for other products
No. of dead insects (no./kg) 4
Mammalian fecal matter (mg/kg) 2
Other fecal matter (mg/kg) 4
Pieces with fungus attacked (% weight) 1
Pieces with insects damages ( %  weight) 1
Other extraneous matter (% weight) 05

Saturday, November 9, 2013

Areca Nut

Areca catechu L
Family: Palmae


 

History

Chewing the mixture of areca nut and betel leaf is a tradition or custom which dates back thousand of years in many Asian and Oceanic countries. It is not known when the areca nut and betel leaf was combined together in to one psychoactive drug. Archeological evidence from Thailand, Indonesia and the Philippines suggests that they have been used for four thousand years or more. In the Indian sub continent chewing of betel and areca nut dates back to pre Vedic period to Harappan Empire. Chinese work “San-fu-huang” supposed to have been written during 140-8 B.C. referred areca nut under the name of “pinlang”, a Malaysian word. Spanish mariner Alvaro de Mandena had reported how Solomon Islanders were chewing the areca nut with leaves of betel and caustic lime that stained their mouths red. 
Opinion of the origin of the areca nut is uncertain and has diverging views. Different researches have found wild species of the genus in Malaysia, The Philippines, India, Sri Lanka, Thailand and in the Sumatra Islands of Indonesia. .
 

Products and Uses

The fruit of the Areca palm, commonly called as areca nut, is mainly used for chewing with betel leaf in almost all South Asian Countries and in Many South East Asian and Oceanic countries. It is a mild stimulant cause a mild hot sensation to the body. Nut is used both in fresh and dried forms. In Pakistan and India Fresh nut are cut and flavored to produce different products. In China and India Areca nut is used in the preparation of Ayurvedic and traditional Chinese medicines. In India powdered areca nut is used as a constituent in some tooth pastes. In some parts of India powdered areca nuts, decoctions or extracted alkaloids from areca are used in the veterinary medicine to remove tapeworms and other intestinal parasites of animals.
Areca leaves are used to produce many house hold items, for decorative purposes and the leaf sheath to make fast decomposing plates, packing materials etc. Traditionally, areca leaf sheaths have been used to pack cooked rice and to preserve treacle of “Fish Tail Palm”.  Matured stems are used as a building material as well as for decoration of religious events by Hindus. Young plants are used as an ornamental plant.    
 

Major Growing Areas

In Sri Lanka areca nut is largely grown in the wet zone and wetter part of the Intermediate zone. However a small acreage of areca palms can be seen in the dry zone too especially near large water lakes and along waterways. Total extent of Areca nut in Sri Lanka is estimated to be about 11968Ha. Kalutara, Kandy, Kegalle, Ratnapura, Badulla and Matale districts are the major growing districts. Almost all areca nut palms are grown in home gardens or as mixed cultivations and little commercial cultivation can be found.
 

Varieties

Areca nuts are grown in throughout wet and intermediate zones for centuries hence there is a wide genetic variability in the Island. A large number of local selections are available in different growing regions but there are number of introduced lines as well. Germplasm, of 1206 lines, is available at the Central Research Station of the Department of Export Agriculture at Matale and several lines which give yield over 1000 nuts/tree/yr have been selected and released to the cultivators.
 

Soils and Climatic needs

Soil
Areca nuts are grown well in a diverse soil types and they perform well in fertile clay loam soils or in gravelly laterite soils of red yellow podzolic type. Plant tolerates water logging to a certain extent and preferred more moist conditions. Sticky clay soils, sandy alluvial soils or calcareous soils are not suitable for the growth of areca plant.

Climate
The cultivation of areca nut is mainly confined to tropical climates. The crop thrives well in humid areas protected against direct hot sun and heavy wind. Exposure of young plants to direct sun causes sun scorching.
Altitude - Grow well up to 500M AMSL.
Temperature – Grow well within 24º – 36ºC and adversely affected by temperatures below 10ºC and above 40ºC.
Rain fall - Can grow within 1750mm-4500mm average annual rain fall ranges. Wet climate with well spread rain fall are ideal for the growth. Areca nut plants are highly susceptible to prolong droughts and in such areas areca nut should be planted near permanent or semi permanent water bodies.

Crop establishment

Planting has to be done with the on-set of monsoon rains. After the preparation of the field, young plants are established in pits of 60cmx60cm filled with the mixture of top soil and cow dung or compost. To facilitate remove excess water drainage channels must be built. When planting in slopes, contour planting is recommended. Application of organic manure is essential for better growth.
Spacing – 3.0m x 3.0m (1100 plants /ha)
Shading – Seedlings should be protected against the exposure do the direct sun light. Temporary shading can be provided by covering the plants with areca leaves, coconut leaves or polythene. Permanent shade can be provided by intercropping with banana, papaw or cassava etc. 
 

Crop management

Fertilizer application:
In Sri Lanka farmers do not fertilize areca nut. But in India, where commercial areca nut plantations exists application of fertilizer is recommended to get a higher yield.
Fertilizer recommendation:
Chemical fertilizer recommendation /plant/ year
100g of N (220g urea)
40g of P2O5 (200g rock phosphate)
140g of K2O (225g muriate of potash)
Should be applied in two split doses
Organic fertilizer
12 kg each of green leaf and compost/plant/year
Fertilizers are applied in basins around the palm dug to a depth of 15-20cm and   0.5-1m radius leaving 20cm from the base of the palm. After application the soil is rolled up and covered with organic matter and soil. However, under Sri Lankan conditions, application of organic residues, green manure or compost at the base of the plant at the rate of 20 kg per palm in two split applications is recommended at the base of the plant.

Weed Control
Research in India has shown that cultivations free of weeds gives better yield

Mulching
Mulching is a regular operation practiced in areca nut gardens in India. It keeps the plant base moist, reduces erosion and keeps the weeds under check. Chopped areca leaves and husks, grass or dry leaves are used for mulching.

Crop Protection
No economically important pest and disease problems are reported.

Harvesting and Post Harvest practices
Areca plant takes 6-7 years for flowering but peak yield comes after 10-12 years old. Bunches of nuts are harvested at different stages of maturity based on the expected use. Usually in Sri Lanka matured nuts are harvested and used in a fresh form or in a dry form. If fermented, fresh nuts can be kept for about a year with out deterioration the fresh quality.
Average yield – 3-4 bunches/tree/year

Standard quality specifications

Medicinal and Chemical Properties
Chemical constituents in areca nut are tannin, gallic acid and a fixed oil gum, a little terpineol, lignin, various saline substances and three main alkaloids namely Arecoline, Arecain and Guacine which have vasoconstriction properties.

Friday, November 1, 2013

Citronella

Cymbopogon nardus/C. winterianus
Family Graminae
alt

History

Citronella plant is a perennial 1-2m tall bush with green to yellowish green leaves. The oldest known records of using citronella oil and leaves as perfumes in religious ceremonies were found in India about 2000 years before. First evidence of using citronella oil in Sri Lanka has been reported by Dr. Nicolas Grim in 17th century. By 18th Century Sri Lanka was a reputed exporter of citronella oil and the samples of Sri Lankan Citronella oil had reported to be displayed in World trade auctions in London and Lisbon. However with the entering of Indonesia and a few other countries in to market the demand for Sri Lankan citronella has been declined.

Products and Uses

The oil extracted from leaves and other aerial parts of the plant is the commercial product of importance. Citronella oil is used as a fragrant in cosmetic industry, soap and detergent manufacturing, polish, paint and in insecticide industry. It is a common mosquito repellent and also used in indigenous medicine as well as in flavoring food and alcoholic drinks in certain countries.

Major Growing Areas

Total extent of citronella is 1065ha. and cultivations have largely been confined to Hambantota and Rathnapura districts.

Varieties

Cymbopogon nadus (“Heen pangiri”) and Cymbopogon winterianus (“Maha pangiri”)) are the two important species grown in Sri Lanka.
Cymbopogon nadus (“Heen Pangiri”)
alt
The “heen pangiri” plant has narrow, long shiny leaves. Leaf sheaths are reddish purple in colour and dried leaves curled down at the base of the bush. Plants are erect and height of the bush is about one meter. Roots penetrate into deep soil. Plant is native to Sri Lanka.

Cymbopogon winterianus (“Maha pangiri”)
alt
Plant has wide, flat long leaves. Bush is large and grows up to 1.5-2m in height. Roots do not penetrate in to deep soil and plant depends on the surface nutrition. Oil has pleasant odor.
 

Soils and Climatic needs

Soil
Cymbopogon nadus can be grown in wide range of soils and even grown in sandy soils. But fertile acidic loam soils are preferable for Cymbopogon winterianus.

Climate:
Citronella groves well in tropical and sub tropical conditions from sea level up to an elevation of about 600m. A hot and humid condition with ample sun light is necessary for growing. An average rainfall of 1500 – 1800mm per annum is adequate for citronella as it bears dry and harsh conditions well.
 

Crop establishment

Planting material
Citronella is propagated by using suckers or rooted stem cuttings.

Field Planting: Field planting could be commenced in the months of April to August or October to January with the onset of monsoon rains. 90cm Χ 90cm and 60cm Χ 60cm is the recommended planting spacing for “Maha pangiri” and “Heen pangiri” respectively. Planting 2-3 suckers in a single planting point instead of 1 plant is a quick method of field establishment.

Crop management
Fertilizer application:
Recommended mixture - 750 kg / ha
Components of the mixture
Parts by weight
Nutrient in the mixture
Urea (46%N) 1.5 17%N
Rock phosphate ( 28 % P2O5) 1.5 11% P2O5
Muriate of potash (60% K2O) 1 14% K2O

Age of plantation
Maha Season (mixture Kg/ha.) Yala Season (mixture Kg./Ha.)
1st Year (kg) 190 190
2nd Year (kg) 375 375

Weeding: Weeds should be kept under arrest and 2-3 times weeding per year is recommended.

Soil Conservation: If citronella is planted in steep slopes suitable soil conservation method should be practiced.
 

Crop Protection

No distinctive pests or diseases of economically important have been found in Sri Lanka.

Harvesting and Post Harvest practices

Harvesting
Harvesting can be commenced 6-8 months after field planting and repeated in every three months intervals. Aerial part of the plant is harvested 12-20cm above the ground level and allowed to wither in the field for 1-2 days prior to processing. Up to 20,000kg/ha of fresh leaves can be harvested and the yield may vary with the agronomic practices and the age of the plantation.
The oil yield can be 60 – 80 kg per hectare and 100kg per hectare for “Heen pangiri” and “Maha pangiri” respectively.

Processing:
Water or steam distillation is the main methods of extracting citronella oil commercially.
Standard quality specifications

Grade Total Gereniol Content
Grade 1 60%
Grade 11 55%
Grade 111 53%
One volume of citronella oil should be soluble in 1-2 volumes of ethanol alcohol.
Medicinal and Chemical Properties
Chemical composition of citronella oil:
Chemical “Heen pangiri” “Maha pangiri”
Citronelal % 5% >32%
Jeraniol % 18% 12-25%
Citronelol % 8% 11-15%
Total Jeraniol % 52-60% 85%

Thursday, October 31, 2013

 Turmeric

Curcuma domestica
Family Zingiberaceae

History

Turmeric has been used in India for more than 5000 years now. Initially it was cultivated as a dye as its’ vivid yellow colour works brilliantly as a colouring agent. Then its highly developed uses were came to know and people started using it for cosmetic and beautification purposes and eventually as a medicine.  Later it was became popular as a spice. Originating in India turmeric had reached China by 700 A.D, East Africa by 800 A.D and West Africa by 1200 A.D. Then it had begun to become popular all through the world. It is known that the Arab traders had carried turmeric with them to Europe in the 13th centaury.

Products and Uses

Turmeric is available in the market as in a whole dried form or in a powdered form. It is also used as an ingredient in preparation of curry mixtures. Oils and oleoresins are extracted from turmeric which is mainly used as coloring and flavoring agent in the food industry.
Turmeric is mainly used as a flavoring and coloring agent in the food industry. It is also used as a coloring in textiles and preparation of specific paints. In Ayurvedic and Chinese medicine turmeric is a common ingredient. In India turmeric is largely used as a disinfectant in day today life and in religious ceremonies.
 

Major Growing Areas

Turmeric is grown in wet and intermediate zones of Sri Lanka as a mono crop and an inter crop under coconut.  Major growing districts are Kurunagala, Gampaha, Kalutara, Kandy and Matale districts.

Varieties

Though there are number of locally grown varieties they are not specially identified. There are imported varieties namely, Gunter, Puna and Madurasi Majal. and they have been mixed with local varieties.

Soils and Climatic needs

Soil
Many soil types are suitable. However well drained sandy loam soils rich with organic matter are the most suitable soil type. Ill drained rocky or clay type soils are not suitable.

Climate
Altitude: up to 1500 MSL
Rain fall: For the successful growth annual rain fall should be 1500mm or high. However turmeric can be grown in the dry zone under irrigation.
Temperature: 20 ºC – 35º C  
p.H – 5.5 – 6.5
Shade: Medium shade is most suitable. High shade declines the yield. Can grow successfully as an inter crop with coconut and banana.
Season: Main season- March April
Minor season - October-November

 

Crop establishment

Planting material:
There are two types of rhizomes as mother rhizomes and finger rhizomes. Matured finger rhizomes are the most suitable planting material. Piece of rhizome should be 40-50g in weight and be with 1-2 buds. Planting material should be disease free and selected from a high yielding cultivation. Before planting, rhizomes should be immersed in a fungicide for about 5 minutes to avoid fungal growth during planting.
Planting material requirement is 2500kg/ha.

Field Planting
Turmeric is planted in raised beds or ridges. Field should be ploughed up to 35-40cm in depth and tilling soil is done. Beds are 1m in width and length is vary with the space available. However when inter cropped with coconut width and length can be changed according to the available space. Height of the bed is about 15cm and drains, with 50cm in depth, should be prepared in between beds.
Spacing – between rows – 30cm
between plants – 25cm
03 rows per bed
Planting depth - 5-7.5cm             
Planting should be done after the rain. If no adequate moisture beds should be irrigated.

Crop management

Mulching
To protect moisture and to keep weeds under arrest mulching should be done immediately after planting. Straw, coir dust, dry leaves or coconut leaves are most suitable mulching material.

Fertilizer application
To add adequate Ca and Mg dolomite is mixed with the soil immediately after ploughing at the rate of 1-2 mt. /ha. To get a higher yield saw dust ash also added to the soil at the rate of 3-4kg/sq, meter of the bed during land preparation period.

Fertilizer recommendation

Time
Organic fertilizer
Urea(kg)
TSP (kg)
MOP (kg)
Basal
At the time of planting
20 mt

100

1st app.
After 01 months
-
65

100
2nd app.
After 03 months
-
65

100
Fertilizer is applied after weeding and should be mixed with the soil. After that beds should be mulched. Fertilizer is applied with rain or should be irrigated after fertilizer application.   
In addition glyricidia leaves can be added as an organic fertilizer and thereby can cut down the need of chemical fertilizer and to protect the soil moisture.

Weeding
Weeding has to be done after one month of planting. The second weeding is done after three months of planting and the beds should be mulched again to protect the moisture. Cleaning drains and earthling up also done with the weeding.

Crop Protection

Diseases
Leaf scorching
Caused by a fungus. Yellow patches appears first and then spread to the whole leaf.  At the serious stage leaves look scorched. Agronomic practices and cultural methods are used as protection measures and if the problem is serious Macozeb-2 is sprayed.
Other diseases in turmeric are Leaf blotch, leaf rot and Rhizome rot.

Pests
Stem borer
Stem borer is the major pest attacks to turmeric cultivation. Adult moth lays eggs in leaf sheaths and caterpillar enters to the pseudo stem and damages the internal tissues of the plant. Initially plants become yellow then turn into brown and die. Dead heart symptom is the clear evidence to identify the presence of stem borer. Damaged plant parts have to be destroyed to control the spread and if the condition is serious recommended insecticide has to be sprayed.  
Leaf rolling caterpillars and scale insects are other minor pest attacks.

Harvesting and Post Harvest practices

Harvesting
Harvesting is done after 8-10 months of planting. If planted in March-April Season turmeric is ready to be harvested by December – January. During that time plants become yellow in colour and start leaves drying. Harvesting is done with care not to damage rhizomes and attached soil clusters should be removed with a wooden stick.
Processing
Mother and finger rhizomes should be separated, washed thoroughly and remove all stem parts. They should be left for about a day for wilting. Mother rhizomes should be cut into pieces. Rhizomes should be boiled well in a closed pot filled with ¾ of water. When boiled properly rhizomes become tender. Instead of water steam boiling can also be applied. Pressure cookers can also be used to boil a few kilo grams of turmeric. Boiled rhizomes should be left in-door for about a day and then put for sun drying. Drying in first three days is limited to 3-4 hours and after that continues drying is must. Whole drying process requires 10-15 days. When dried properly, metallic sound can be heard. Dried rhizomes are rubbed on a rough surface to become them to bright yellow in color.  
 

Standard quality specifications




Moisture
9%
Curcumin 5-6%
Extraneous matter (to physical weight) 0.5%
Essential oil 3-5%

Medicinal and Chemical Properties

Main chemical compound in turmeric is curcumin. Curcumin content vary from 2-6% depending on the species.
Last Updated on Monday, 16 August 2010 12:02 

Monday, October 28, 2013

Betel

Family: Piperaceae

Genus: Piperacea

Botanical name: Piper betle L.

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History

Betel is an evergreen, perennial climber widely grown all over the Sri Lanka. The commercial product is the leaf, mainly used for chewing with Arecanut, slaked lime, tobacco and some other ingredients.  Betel chewing habit in Sri Lanka goes dates back to 340 B.C and during that time betel was a prestigious item used by the prestigious society of the country. The origin of betel is believed to be in Malaysia or in surrounding East Asian region and it is said to have been introduced to Sri Lanka and other South Asian Countries by Chinese and Arab   merchants. However, over ten wild relatives of betel are found in Sri Lanka.
Today betel is grown for local consumption and exports and Major betel growing countries are Sri Lanka, India, Thailand and Bangladesh. Pakistan is the major importer of Sri Lankan betel.

Products and Uses

The leaves of this plant have a higher economical and medicinal value but from ancient times it has been mostly used for chewing purposes and ceremonial events along with other condiments. This chewing combination in the form of a betel quid could be varied with different ingredients from country to country.
Several value added products from betel has been formulated and those include betel toothpaste, mouthwash, shampoo, face cream, instant betel quid and pellets.

Major Growing Areas

Betel is grown in all over the country but the commercial production of export quality betel, with bigger leaves with dark green colour combined with thickness, known as “Kalu bulath” is significantly confined to few districts such as Kurunagala, Gampaha, Kegalle, Kalutara and Colombo.

Varieties

Large number of local betel accessions are grown in Sri Lanka. Among them "Maneru", "Ratadalu" and "Galdalu" are popular betel varieties with high export quality .

Soils and Climatic Requirements

Soil
Betel can be successfully grown in well-drained, fertile soils in wet to dry climatic zone of Sri Lanka. Especially the lataritic and clay loam soils in Kurunagala and Gampaha districts are highly suitable for betel cultivation. Waterlogged, saline or alkali soils are not suitable for the growth of betel.
Climate
Elevation – Can be successfully grown up to 1000M amsl.
Well-distributed annual rainfall enhances the growth of betel vines.
Betel is a sun loving plant but produces better quality leaves in the wet zone and intermediate zones rather than in the dry zone. Appropriable shade levels and irrigation are essential for successful cultivation of the crop. Hot dry winds are harmful and retard the growth of the vine.

Crop Establishment

Planting material
Betel is usually propagated by using stem cuttings. Cuttings should be healthy and taken from mother vines with high yielding and leaves are comparatively bigger and dark green in colour. Cuttings can directly be field planted or can be planted as rooted cuttings established in poly bags filled with a mixture of equal parts of top soil, cow dung, coir dust and sand.
Field Planting
Betel is usually planted in sunken beds. The field should be flat, well drained and with good sun shine. The field should not have a betel cultivation infected with Bacterial Leaf Blight at least for 2 years. After the land preparation, beds, usually in the size of 1.2mx7.5m, are prepared. Bed size can vary with the space available. Adequate spacing should be left between beds to allow management practices and to control the spread of disease. Beds should be sterilized by burning straw or ash on it. Around the cluster of beds a drainage canal of 30cm width, 60cm depth should be built.
An artificial live or dead support should be provided to betel for upright climbing. Supports, called as stakes, are established in the beds at the spacing of 45cmx 45cm. Two cuttings are planted near a stake. Before planting, cuttings should be immersed in a fungicide mixture for about 2 minutes. 
Instead of beds betel can be established as single plants. Cuttings are planted in 30cmx30cm pits, filled with top soil and cow dung mixture, and stakes of 2-4cm diameter should be established as supports. The spacing between plants is 1.8x1.8cm. Either live supports of Gliricidia sepium or durable dead wood support can be used.
Beds should be covered with coconut fronds or other shading material for about 4-6 weeks. Beds should be watered once or twice daily. Sprouting from cuttings starts within 20-45 days and after that shade should be removed gradually.

Crop Management

Fertilizer Application
Betel leaves are picked once in every 3-4 weeks and with that substantial quantity of nutrient is removed from the field. Therefore application of chemical fertilizer is essential for higher yield and better growth. 
Fertilizer recommendation
Urea                                         195g
Triple Super phosphate                 65g
Muriate of Potash                       100g
Keserite                                      60g   
420g of above mixture should be applied to 100 betel vines in every three weeks intervals.
Organic fertilizer
Initially cow dung or compost should be applied to the bed after about one month and it should be mixed well with soil without damaging to the newly planted cuttings. Well composed poultry manure or goat manure can also be used for betel. Application of               decomposed Glyricidia leaves is highly beneficial for better growth and higher yield.
Pruning and Training
It is generally trained either to live supports or dead supports but concrete post or coir ropes can also be used as substitutes.
  • Pruning at 1m height of the betel vine is preferred to increase the plageotropic branches and yield.
  • After 1.2 m growth of the betel vine Trellis is established.

Crop Protection

Diseases
Bacterial Leaf Blight
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Betel leaf blight is caused by bacteria, called Xanthomonas campestris betlicola. Disease becomes epidemic during rainy seasons. First characteristic symptom is moist oily patches on underneath of leaves. Gradually they spread and turn into brown or black in colour. When the condition is serious these patches can spread to the stem resulting of shedding leaves and nodes. Consequently the plant will die but the disease can easily spread into surrounding vines.  No control measure has been identified other than destruction of seriously diseased plants. Diseased plants and near by plants should be burned on the spot. A chemical treatment can be applied to control the spread. All matured leaves of remaining vines should be removed and a chemical solution (mixture of 28g of copper based fungicide, 28g of Mancozeb and 28g of Captan dissolved in three gallons of water) should be sprayed once or twice to betel vines.
The spread of disease can be controlled by lowering the application of chemical fertilizer and water for infected betel plots. Use of disease free planting material, use of a agro well or a isolated water source for irrigation and adhering to strict hygienic practices are important ways to avoid contamination.
Occasional death of betel vines in a plot can be observed in some betel cultivations.  Main reason for such situation is due to nematode attacks.  Nematodes attacks to root system and cause partial destruction but secondary attacks of fungus and bacteria cause foot rot and destruction of root system causing to consequent death.
Fungal Foot rot and fungal attacks on leaves are other minor disease problems in betel cultivation.

Pests

No economically important pest problems are reported but insect damages by suck sapping insects and damages of red mites to betel leaves are commonly found in betel cultivations.

Harvesting and Post Harvest practices

Harvesting is started when the betel vine is grown up to 1.2-1.8m in length.  Initially matured leaves (Kanda kola) are removed in lower parts of the main stem 2-3 times. After that betel leaves are harvested both from main stem and lateral stems. For export market betel is harvested from three weeks intervals and for local market in two weeks intervals.  Harvested betel leaves are bundled, having 40 leaves for each, before sending to the market. For export market those bundles are packed in specially prepared cane baskets.

Medicinal and Chemical Properties

The important constituent of the betel leaves is a volatile oil. Some of the major compounds identified in Sri Lankan betel oil are β-phellandrene, 4-terpinol, eugenol, chavibitol acetate, safrole and allylpyrocatechol diacetate.

Standard quality specifications

There are no specific quality parameters for betel. But for export quality betel following criteria is considered,
Size of the leaf – At least 20cm in length and 15cm in width
Color – well matured dark Green color leaves
High pungency
Freshness of the leavesStem of the leaf must be 2.5-3cm
Last Updated on Monday, 09 January 2012 10:23

Sunday, October 27, 2013

Nutmeg

Myristica fragrans
Family: Myristaceae

   

History

Nutmeg is a perennial ever green spice tree and a native of Molluccas in East Indonesia.  There is some evidence to suggest that the Roman priests may have burned nutmeg as a form of incense. It is also known to have been used as a prized and costly spice in medieval cuisine, used as flavorings, medicines, preserving agents and that were at the time highly valued in the European markets. Nutmeg is reported to have been introduced to Sri Lanka in the beginning of the 19th centaury but there are evidences that the crop had been brought here even before that by merchants who were traveling on the Silk Road.  
Products and Uses
Nutmeg and mace are the main two products. Oils are extracted from both nutmeg and mace. Powdered nutmeg and mace is used in curry powders.
Nutmeg and mace are mainly used for culinary purposes to flavor curries and other food products, confectionaries and bakery products. It is also used in preparation of beverages and drinks. Nutmeg is used as an ingredient in Ayurvedeic and Chinese medicine.
 

Major Growing Areas

Nutmeg prefers cooler climates hence mid country areas of Sri Lanka are ideal for the growth of nutmeg.  Total extent of Nutmeg in Sri Lanka is 924ha and from which 80% of the extent is in Kandy district. Other major growing areas are Kegalle and Matale districts.
Varieties
In Sri Lanka no specific varieties have been identified. Mother trees are selected considering high yield (over10,000fruits/tree/yr), regular bearing habit, size of the nut (wet weight 10g /fruit) and heavy mace (wet weight 1g/fruit).
Soils and Climatic needs
Soil
Deep well drained loams, and sandy clay loams rich in organic matter are preferable. Soils with high water table or liable to water logging are unsuitable.
Climate
Rainfall – well distributed rain fall of 1,500-2500mm. is sufficient
Temperature – average annual temperature should be 20-30 C
Altitude – up to 1500m
Shade is essential during the first two years of growth. Thereafter exposure to light is beneficial. However cooler, humid micro climate is much preferred for establishment and fruit setting.
Persistent strong winds are harmful.  Sheltered valleys and leeward slopes are best for growing cardamom.

Crop establishment

Planting material
Seeds are used for planting. Dark brown full sized seeds of matured fruits from selected mother plants are used for planting. Seeds have to be sown in nursery beds as soon as possible since the viability is lost within 8-10 days.
Seedlings are potted in poly bags filled with a mixture of equal parts of top soil, cow dung and sand. About 10g of rock phosphate are also added. Seedlings are kept under shade for about 6-8 months, then hardened and transplanted in the field. If large size plants are needed seedlings of 6-8 months of age are re-potted in bigger poly bags filled with same mixture and kept for another 9-12 months. Bigger plants establish well in the field.
For healthy growth of nursery seedlings, fertilizer solution (1kg urea, 0.5kg TSP, 0.75kgMOP dissolved in 100L of water) can be sprayed.

Field Planting

Spacing – 20’x20’(250 plants/ha.)
Planting is done with the on set of monsoon rains. Planting hole is 21/2’x21/2’ in size and is filled with a mixture of top soil and cattle manure. The collar of the plant has to be at the soil level and the care has to be given not to damage or bending the tap root during the planting. Soil around the plant has to be mulched adequately after the planting.
Temporary shade has to be provided to protect plants from direct sunlight. It is better if temporary shade trees have to be planted before 6-8 months of planting. 

Crop management

Removal of Male Plants
There are separate male and female trees in nutmeg but the sex cannot be identified from out side appearance. Only way for an average farmer to identify the sex of tree is after flowering. Generally 50% of the seedlings are males. Male trees do not set fruits but are essential for the pollination. Therefore after flowering male trees are removed marinating 1: 10 of male: female ratio. Vacancies are in-filled with new plants.

Fertilizer application

Recommended mixture - 625 kg / ha at the 10th year and after (density 250 plants/ha)
Components of the mixture
Parts by weight
Nutrient in the mixture
Urea (46%N) 2 13%N
Rock phosphate ( 28 % P2O5) 2 8% P2O5
Muriate of potash (K2O) 3 25% K2O
Kieserite (24%MgO) 1/3 1% MgO
Rate of fertilizer application:
Year Maha Season
(mixture g/plant.)
Yala Season
(mixture g/plant.)
1 120 120
2 250 250
3 375 375
4 500 500
5 625 625
6 750 750
7 875 875
8 1000 1000
9 1125 1125
10 yr. onwards 1250 1250

Terracing and Weeding

It is essential to bench terrace the base of the seedling particularly in sloping lands initially to a diameter about 0.5m. and thereafter widen as plant grows. An inward slope of the terrace will help to reduce the erosion of cut soil.
Weeds must be kept under check. Frequent slashing is recommended and slashed material must be applied to the base of the plant as mulch.

Crop Protection

Diseases and Pests

There are no economically important disease and pest problems.

Harvesting and Post Harvest practices

If well managed, nutmeg starts to bear at the 7th year and harvest increases with time. Productive age of nutmeg is uncertain as it can give good crop more over hundred years. However peak harvest comes after 20 years of age.
Yield of nutmeg vary from tree to tree from several nuts to 8000-10000 nuts per tree. Average yield is 1500dry nutmeg/tree/year and 1-1.5kgdry mace/tree/year.
As soon as fruits split or about to split they are hand picked from the trees. Fruits are opened by hand and the mace is removed from the nut by cutting with a small pointed knife where it is attached to the base of the nut. The nuts are dried until the kernel rattles in the shell. Dried nutmeg can be sold as it is or can be shelled and sold only the kernel. 
The mace is flattened by hand and dried slowly under the sun until a bright orange-yellow fragrant product is obtained.

Standard quality specifications

MaceGrade 1:

Shell consist of well dried mace containing not more than 5% of pieces less than one forth of the size of the normal whole mace.
 

Grade ll:


Shell consist of well dried mace in pieces
Moulds and Insects: Shall not be ore than 3% by mass in either grade
Extraneous Matter: Shall not be more than 1% by mass in either grade
 

Friday, October 25, 2013

Clove

Eugenia caryophyllus

Family : Myrtaceae

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History

The clove tree is a medium sized symmetrically shaped tree with smooth grey bark. It is believed to be originated in Maluku Islands in Indonesia. Clove along with nutmeg and pepper were highly prized in Roman Era. Cloves were traded by Arabs in the Middle ages but in the 15th century Portugal took over the trade. The Portuguese brought large quantities of cloves to Europe mainly from Malku Islands and valued it at seven grams of gold per kg. Later the Spanish then the Dutch dominated the trade till the seventeenth century.  The French introduced clove to Mauritius in the year 1770 subsequently the cultivations were introduced to Guiana, Zanzibar, West Indies and most of the Brazil.  It is not known how and when clove was introduced to Sri Lanka but may be the Arab traders or Colonial rulers may have brought the plant to the country as Sri Lanka was a major trading hub for spices during that time. 
Products and Uses
Clove is largely used as dried whole buds. Ground clove is used for curry mixtures and clove oil is used for flavoring foods and in pharmaceutical perfumery industry.
Cloves are used either whole or ground to provide flavor for both sweet and savory foods in pickling and the production of sauces and ketchups. In medicine it is valued as a carminative, aromatic and stimulant. It is being used in cigarette industry as a flavoring agent. Clove oil is used in perfumes, in dentistry and a clearing agent in microscopy.
 

Major Growing Areas

Clove is mainly grown in Mid Country wet zone of Sri Lanka. Total extent of clove is 7618ha. and Kandy, Kegalle and Matale districts are major growing areas.
 

Varieties

No specific varieties have been identified. However there are trees produce bigger size clove buds which are called as “Bothal Karabu”. 
 

Soils and Climatic needs

Soil

Clove thrives well in a variety of soils. Deep and rich loams with high humus content are best suited for the crop. It also grows satisfactorily on laterite soils. Pure sandy soil is unsuitable for this crop. Clove does not tolerate water logging and therefore land selected for this crop should be well drained.

Climate
Clove grows well in a humid tropical climate from sea level up to 1000m elevation.
An average rainfall of 1750- 2500mm. per annum is sufficient. It is however, necessary that dry periods alternate with moist ones for good flowering
The annual average temperature should be 20 o - 30o C without much seasonal and diurnal variation.
Persistent strong winds are harmful.
Shade is essential during the first two or three years of growth. Thereafter full exposure to light is beneficial.

Crop establishment

Planting material

Clove is propagated through seeds. Tree ripe fruits should be sown immediately since the viability of seeds is rapidly lost within 48 hours of collection. Seeds obtained by removing outer pulp show early and uniform sprouting. The seeds are sown in perforated polythene bags consist of equal parts of well decomposed farm yard manure, top soil and coarse sand. The size of the polythene bags may vary from 10 Χ 20cm to 25 Χ 40cm depending on the time kept in nurseries before field planting. Bigger plants (15-20months) establish better in the field.

Field planting: Spacing: 20’Χ20’(250 plants/ha)
Temporary shade for 2-3 years is necessary. Artificial shade for newly established plants may be required during sunny seasons. Whenever possible ground cover crops such as leguminous sps, which do not compete with clove, should be established as a soil conservation measure.
Crop management

Fertilizer application

Recommended mixture - 625 kg / ha at the 10th year and after (density 250 plants/ha)

Components of the mixture
Parts by weight
Nutrient in the mixture
Urea (46%N) 2 13%N
Rock phosphate ( 28 % P2O5) 2 8% P2O5
Muriate of potash (K2O) 3 25% K2O
Kieserite (24%MgO) 1/3 1% MgO
Rate of fertilizer application:
Year Maha Season
(mixture g/plant.)
Yala Season
(mixture g/plant.)
1 120 120
2 250 250
3 375 375
4 500 500
5 625 625
6 750 750
7 875 875
8 1000 1000
9 1125 1125
10 yr. onwards 1250 1250

Crop Protection

Diseases

No serious diseases and pests have been reported in Sri Lanka

Pests
No serious pest and diseases have been reported in Sri Lanka except wilting of nursery plants in large proportions. The incidence of wilting can be controlled by controlling shade and water application. Leaf spotting due to Pestalots sp. and Collectotrichum sp is fairly common in nurseries and during wet weather, but do not seem to have any serious effects.
 

Harvesting and Post Harvest practices

Harvesting
The right stage of harvesting clove buds is when flower petals change their colour from olive green to yellow pink. Clusters of flowers are harvested together with the stalks. The harvesting season commences usually in December and extends up to the end of April depending upon the locality.
The average yield of dry cloves in Sri Lanka is about 250kg/ha.Under good management conditions a yield of abut 850kg/ha can be obtained.

Processing:
The flower buds should be detached from the stalks and both buds and stalks are dried in sun or artificial drier until they become dark brown and hard. Well dried good quality cloves are in golden brown color and badly dried cloves are soft and pale brown with a whitish mealy appearance which are known as “khuker” cloves. Green clove buds of the right stage give about 30% dry cloves. Well dried cloves (8-10% moisture) can be stored in gunny bags without damage by fungus and insects for 1 or 2 years.

Standard quality specifications

The specifications given by the Sri Lanka Slandered Institute is as follows.



Gr.2

Gr.2 Gr.3
Khuker cloves max. % by mass. 3 5 10
Cloves below 10mm length max % by mass 15 25 N.A
Extraneous matter max % by mass 1 2 3
Moisture max. % by mass 12 12 14

Medicinal and Chemical Properties

Eugenol comprises 72-90% of the essential oil extracted from cloves and the compound is most responsible for the aroma of cloves. Other important essential oil constituents of clove oil include acetyl eugenol, beta-caryophyllene and vanillin, crategolic acid, gallotannic acid, methyl salicylate, eugenin, kaempferol, rhammentin, eugenitin, oleanolic acid, sigmasterol and campesterol.

Clove is used in Indian Ayurvedic medicine, Chinese medicine, western herbalism and in the dentistry, where the essential oil is traditionally used as an anodyne (painkiller) for dental emergencies. Cloves have carminative effect to increase hydrochloric acid in the stomach and to improve peristalsis. Clove oil is used in various skin disorders like acne, pimples etc. and also used in skin burns , skin irritation and sensitiveness of skin.

Monday, October 21, 2013

Vanilla

Vanilla fragrans
Family – Orchidaceae

 History
Vanilla is an economically important crop as it is the source of natural vanillin. It is believed that vanilla is indigenous to north eastern Mexico. It is ancient Totonaco Indians of Mexico who were the first keepers of the secrets of vanilla. When they were defeated by the Aztecs they were demanded to relinquish their exotic fruit, vanilla pods. Later Aztecs were defeated by the Spanish and Spaniard Hernando Cortez, the Spanish mariner, returned to Spain with the precious plunder vanilla beans which were combined with cacao to make an unusual and pleasing drink. For eighty years this special beverage was only enjoyed by the nobility and the very rich. Then in 1602 Hugh Morgan, Apothecary to Queen Elizabeth I, suggested that vanilla could be used as a flavoring all by it self and versatility of the exotic bean was finally uncovered. However only in 1858 Gobley was able to isolate vanillin from vanilla pods. Today vanilla is grown by Madagaskar, Indonesia, Mexico, Thahiti and few other countries including Sri Lanka as a commercial crop.
 

Products and Uses

Vanillin is the main product extracted from vanilla. It is used as a flavor ingredient in confectionery industry, perfumery and pharmaceutical industries.
 

Major Growing Areas

In Sri Lanka vanilla is mainly confined as a home garden crop grown in mid and low country wet zone. Total extent is less than 100ha. and main growing areas are Kandy, Nuweraeliya,Matale and Kegalle ditricts.
 

Varieties

No specific varieties have been identified in Sri Lanka and planting material is taken from traditionally grown vines.
 

Soils and Climatic needs


Soil
High fertile well drained loamy soils are preferable. Soils should be rich in organic matter. 

Climate
Altitude - Vanilla performs well up to 1000m above the mean sea level.
Temperature – 21-32 0C is suitable. But Vanilla performs well at 27 0C
Rainfall – 2000-2500 mm. But 2-3 months dry spell is needed for flower initiation.
 

Crop establishment

Planting material
Vegetative methods are practiced. Cuttings, 3’-4.5’ (1-1.5m) in size, are obtained from selected mother vines. Lower end of the cuttings should be closer to the node and 3-4 leaves should be removed from the lower end. To induce buds cuttings should be hanged on a support for about 7 days.

Field Planting
Vanilla is a shade loving plant hence live support trees are used to provide adequate shade (50-60%). Glyricidia is the most suitable shade tree and support trees should be established at least six months before planting vanilla.
Spacing – 3m x 1.5 m (10’ x 5’) (2000 cuttings / ha)
Planting should be done with the on set of rain. Loosen the soil around the base of support up to 8’’ deep in and area of about 2’ in diameter. Then add 2-3 basket of organic manure. Make a furrow 10 (4’’) deep (from support tree and across the surface of planting pit.) and place the cutting horizontally in the furrow leaving 3 cm from lower cut end jutting out into air . Cuttings should be buried firmly with upturned soil. The upper end of the cutting is tied up on to the support tree and mulching should be done up to thickness of 7.5 – 15 cm using decayed organic matter.

 

Crop management

Training of vines -
When cuttings start to grow emerging axial buds should be trained to turn vines to grow upward direction. When vines reach top of the support tree they should be allowed to droop. When reached to ground let them to grow on soil further 30 -45 cm (1-1.5’) and then curl the stem upwards and allow the buds to grow up again on the support tree. This process should be repeated until vines form several loops. Ground area of loops should be covered with organic manure.

Stimulate flowering –
To get the maximum number of flowers flowering should be induced artificially. Usually this practice is done in January. For that 5-7 nodes are removed from the tip of drooped matured branches. To get 70-80% sunlight shade trees too should be pruned. .

Manuring-
Usually artificial fertilizer is not applied to vanilla but organic fertilizer is essential.  Compost should be applied at the beginning of each rainy season. Plants should be mulched at least once in six month with dry or fresh leaves and lopping of shade trees. 

Pollination-
In vanilla artificial pollination is essential as the natural pollination rarely produce pods. Flower is self-fertile, but incapable of self-pollination without the aid of an outside agency to either transfer the pollen from the anther to the stigma or to lift the flap or rostellum and press the anther against the stigma. Usually flowers come out in April-/ May period and flowers are small lily like, greenish-yellow in colour. There are about 20 flowers in a raceme. Usually, only one flower in a raceme opens in a day, with the entire flowering period of the raceme lasting an average of 24 days. The flower opens in the morning and closes in the afternoon, never to re-open. If it is not pollinated, it will shed the next day. The optimum time for pollination is in mid morning.
 

Crop Protection

No economically important pests and diseases have been reported
 

Harvesting and Post Harvest practices

Harvesting –
Pods reach maturity after 8-9 months from pollination. Harvesting mainly falls in December- January.  Ideal stage is when tip of the green pods start turning yellow and before split opened of the lower end of pods. In harvesting only mature pods should be e harvested. To make one kg of pods 70 -100 well ripened pods are needed and 6 kg of raw pods are needed to make 1kg of cured pods. Pods must atleast be longer than 6cm and better quality pods must be longer than 10cm. To get quality bulk of pods small pods ( Less tan 10 cm long) should be removed from the plants 2 months after pollination and allow only 8-10 pods in a bunch and remove all other pods. Pods should be plucked by turning upright and should not be used pair of scissors or knife to avoid fungus formed in cut end.
Yield – After 3 years of planting 500 – 800 kg/ha and peak yield level at 8years
Processing
There are several methods of processing but basic steps in each and every method are same. Those steps are
  • Killing or Wilting – Initiates the on set of enzymatic reactions responsible for the production of aroma and flavor. Pods become brown in color.
  • Sweating - Increase the temperature to promote the enzymatic reactions and to provoke fairly rapid drying to prevent harmful fermentations, Develop deep brown coloration of pods.
  • Drying – Slow drying. Beans reach to one-third of their original weight
  • Conditioning – Store in closed boxes for a period of three months or longer to permit the full development of desired aroma and flavor
The aroma and flavor of the cured vanilla bean/pod are the characteristics that determine the bean’s commercial value on the world market. Processing should be done carefully to preserve the maximum aroma and flavor as well as the physical appearance. Once the mature vanilla beans have been picked, they are taken to the curing and sorted according to size and condition. Sorted beans are plunged into large vats of hot water (63 degrees Celsius) and quickly drained. The warm beans are wrapped in dark colored cotton fabric and after a day they are laid on slatted platforms to dry in the open sun for an hour. For about a week, the beans are left for two hours a day to dry in the sun and rolled in cloth between drying session. At this stage the vanilla beans have become quite supple. For the next two or three months the vanilla beans are spread on racks in the shade or in well-ventilated rooms to allow their full flavor and fragrance to develop. After the curing process, vanilla beans are sorted in an open airy place and graded according to length before they are bundled for shipment. By this time, their aroma is quite remarkable.

Standard quality specifications
Length of pods – between 17-25cm
Smell - Inherited vanilla smell
Color – Dark brown or black color
Appearance - Shiny oily surface
Lack of insect attacks or other patches
Cleanness – Lack of extraneous matter, animal o plant parts or insects
Moisture – around 25%-30%

Medicinal and Chemical Properties

Though there are many compounds presents in the extracts of vanilla, Vanillin (4-hydroxi-3-methoxybenzaldehyde) is primarily responsible for the characteristic flavor and smell of vanilla. However there are hundreds of minor compounds in vanilla extract. Main compound in vanilla oil is piperonal (heliotropin)