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Jute Harvesting and Retting — Extracting Jute Fiber in Bangladesh
Detailed instructions on cultivation, harvesting, retting, and fiber extraction of jute (Corchorus capsularis and Corchorus olitorius) in Bangladesh. Bangladesh produces approximately 33% of the world's total jute. Jute grows in warm, humid climates, is sown in March-May and harvested in July-September. This blueprint describes every step including jute identification, determining harvest time, bundling, selecting retting sites, the retting process, fiber separation, washing, drying, grading, and storage.
中級者
3-5 days (including retting)
手順
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Understanding the Jute Plant
Understanding the Jute Plant
Jute is a fiber crop of the genus Corchorus. There are two main species: tossa jute (Corchorus olitorius) and white jute (Corchorus capsularis). Tossa jute is golden in color, stronger, and smoother — it is called the Golden Fiber. White jute is comparatively coarser and less lustrous. Bangladesh produces approximately 33% of the world's total jute and is the second largest jute-producing country in the world. The jute plant grows 2-4 meters tall and fiber is extracted from its bark.
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Understanding Jute Land and Climate Requirements
Understanding Jute Land and Climate Requirements
Jute grows best in hot and humid climates. A temperature of 24-37 degrees Celsius and relative humidity of 70-90% are required. Annual rainfall of 1500-2500 mm yields good harvests. Low-lying alluvial soil rich in silt (silty loam) is ideal for jute — the Ganges-Brahmaputra-Meghna delta in Bangladesh is the best in the world for this reason. Seeds are usually sown in March-May (Chaitra-Baishakh).
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Determining the Harvest Time
Determining the Harvest Time
The jute plant is ready for harvesting 120-150 days after sowing, usually in July-September (Shraban-Bhadra). Signs of the right time: small flowers begin to bloom (yellow on tossa jute, white on white jute). Harvesting at the onset of flowering yields the best fiber quality — soft, smooth, and strong. Delaying too long makes fiber hard and coarse.
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Cutting the Jute Plants
Cutting the Jute Plants
Jute plants are cut close to the ground (2-5 cm above soil level) in a single stroke with a sharp sickle (da). Morning is best — less sun intensity and worker fatigue. Cut plants are left in the field 2-3 days for leaves to fall off, which reduces water pollution during retting.
必要な工具:
Steel Sickle (দা)5
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Bundling the Jute Plants
Bundling the Jute Plants
After leaves have fallen, jute plants are tied into small bundles of 20-30 plants. Butt ends are aligned evenly. They are tied tightly near the base with jute bark or rope. Bundles too large cause uneven retting since water cannot reach inner plants. Each bundle should be hand-carryable.
このステップの材料:
Jute Twine1 束6
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Selecting the Retting Site
Selecting the Retting Site
For retting, select a clean water body with slow current — ponds, canals, wetlands, or calm river sections. Water depth must be at least 1-1.5 meters. Clean, slightly acidic water (pH 6-7) gives better results. Stagnant polluted water causes poor fiber color and odor. Sunlit open water bodies are preferable as temperature accelerates bacterial activity.
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Retting the Jute
Retting the Jute
Bundles are completely submerged in water, weighted down with wooden logs, banana stems, or earthen weights. The retting process takes 10-20 days depending on temperature and water quality. Warm water (30-34 degrees Celsius) accelerates the process. Clostridium and other anaerobic bacteria break down pectin and lignin, loosening fiber from the woody core (pith).
このステップの材料:
Banana Stem Weights5 個8
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Checking the Retting Progress
Checking the Retting Progress
From 8-10 days after retting, check progress daily. Lift a plant and pull the bark at the butt end — if it separates easily from wood, retting is complete. Over-retting weakens fiber and darkens color. Under-retting leaves woody pieces attached. Cessation of surface bubbles signals completion.
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Stripping the Fiber
Stripping the Fiber
Once retting is complete, bundles are lifted from water. The worker stands waist-deep and pulls bark from each plant's butt end. Fiber comes out like long threads. The woody core (shola/pith) is discarded. Fiber is rinsed by shaking in water to remove residual pectin and wood particles. A skilled worker strips 25-30 kg raw fiber per day.
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Washing the Fiber
Washing the Fiber
Stripped fiber must be thoroughly washed in clean water 2-3 times. Submerging and shaking by hand removes dirt, residual pectin, and mud. Well-washed fiber takes on a bright golden color — a sign of high quality. Foul-smelling or darkish fiber is considered low quality.
このステップの材料:
Distilled Water (1 Liter)50 リットル11
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Drying the Fiber
Drying the Fiber
Washed fiber is dried in the sun, hung on bamboo frames or ropes for air circulation. Direct sunlight for 2-3 days fully dries the fiber. Never dry on the ground — soil contamination reduces quality. Cover during rain. When moisture drops below 12-14%, fiber is ready for storage.
必要な工具:
Bamboo Drying Frame
Hanging Rope12
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Grading the Fiber
Grading the Fiber
Dried fiber is classified by quality using two grading systems: Bangla White (BW) for white jute and Bangla Tossa (BT) for tossa jute. Criteria: color (bright golden is best), strength, smoothness, cleanliness (woody particles/dirt), and length (longer is more valuable). BT-A and BW-A are the highest grades.
必要な工具:
Sorting Table13
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Bundling and Storing the Fiber
Bundling and Storing the Fiber
Fiber is tied into separate bundles by grade, each weighing 5-8 kg. Store in a dry, cool, well-ventilated warehouse on elevated pallets to protect from floor moisture. Excessive moisture causes fungal growth and weakens fiber. Farmers sell fiber at local markets (haats) or jute trading depots (arats).
このステップの材料:
Jute Twine1 束
Wooden Storage Pallet2 個必要な工具:
Weighing Scale14
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Uses of Jute Pith (Shola)
Uses of Jute Pith (Shola)
The remaining woody stem (jute stick or shola) is not discarded — it serves multiple purposes. Used as cooking fuel, for building house fences, and for charcoal production. Modern applications include particle board and activated carbon manufacturing. No part of the jute plant goes to waste — a completely zero-waste crop.
材料
4- 2 束プレースホルダー
- プレースホルダー
- 50 リットルプレースホルダー
- プレースホルダー
必要な工具
5- プレースホルダー
- プレースホルダー
- プレースホルダー
- プレースホルダー
- プレースホルダー
CC0 パブリックドメイン
このブループリントはCC0で公開されています。許可を求めずに、自由にコピー、修正、配布、あらゆる目的で使用できます。
メイカーを応援するには、ブループリント経由で製品を購入してください。メイカーには メイカーコミッション がベンダーにより設定されています。または、このブループリントの新しいイテレーションを作成し、自分のブループリントにコネクションとして含めて収益を共有できます。