Unit 5: Crop Production Package of Practices for Kharif Fibre Crops

I. Orientation — Kharif Fibre-Crop Production

Kharif fibre crops are generally sown with the onset of the south-west monsoon and grown primarily for fibres obtained from seed hairs or stems. Cotton supplies seed fibre, whereas jute supplies bast fibre from the stem phloem. Their production packages integrate suitable cultivars, timely sowing, balanced nutrition, water and weed management, plant protection, harvesting, and fibre-quality preservation.

• Defining characteristics:
  • Season: Establishment normally occurs from March to July, depending on rainfall, irrigation, crop duration, and region.
  • Commercial product: Cotton produces lint around seeds; jute produces fibre bundles beneath the stem bark.
  • Quality dependence: Cotton quality depends on staple length, strength, fineness, and cleanliness; jute quality depends on fibre length, strength, colour, lustre, and retting.
  • Management principle: Variety and agronomic practices must be matched with soil, rainfall, temperature, and prevalent pests.
  • Yield expression: Cotton yield is commonly reported as seed-cotton yield in kilograms per hectare; jute yield is reported as dry fibre yield in tonnes per hectare.

II. Cotton — The Major Seed-Fibre Crop

A. Origin

Cotton comprises species of Gossypium in the family Malvaceae, and cultivated cotton arose through independent domestication in the Old and New Worlds.

• Old World cottons:
  • Gossypium arboreum: Associated with the Indian subcontinent; commonly called Asiatic or desi cotton.
  • Gossypium herbaceum: Associated with Africa and adjoining south-western Asia.
  • Chromosome constitution: Both are diploid species with 2n = 26.
• New World cottons:
  • Gossypium hirsutum: Originated in Mexico–Central America; known as American upland cotton.
  • Gossypium barbadense: Originated in tropical South America, particularly the Peru–Ecuador region; includes Egyptian and Sea Island types.
  • Chromosome constitution: Both are allotetraploids with 2n = 52.
• Present significance: G. hirsutum dominates world cultivation because of its high yield, broad adaptation, and suitability for spinning.

B. Geographical Distribution

Cotton is cultivated across tropical and subtropical regions where the frost-free season is sufficiently long.

• World distribution: Major producers include India, China, the United States, Brazil, Pakistan, Turkey, and Uzbekistan.
• Indian distribution: Cotton occupies three broad agro-climatic zones:
  • Northern zone: Punjab, Haryana, and Rajasthan; predominantly irrigated cultivation.
  • Central zone: Gujarat, Maharashtra, and Madhya Pradesh; the largest rainfed cotton belt.
  • Southern zone: Telangana, Andhra Pradesh, Karnataka, and Tamil Nadu; both rainfed and irrigated systems.
• Regional pattern: Black-soil areas of the Deccan Plateau support extensive rainfed cotton, while alluvial northern soils support intensive irrigated production.

C. Economic Importance

Cotton is a major industrial, employment-generating, and oilseed crop, often described as the “king of fibres.”

• Textile fibre: Ginning separates lint from seed; lint is used for yarn, cloth, absorbent cotton, and blended textiles.
• Seed products:
  • Oil: Cottonseed contains approximately 15–20% oil and provides edible oil after suitable refining.
  • Meal and cake: Used as protein-rich livestock feed or manure, subject to safe management of gossypol.
  • Linters: Short fibres remaining on seed are used in cellulose products, paper, and medical materials.
• Crop residues: Stalks serve as fuel, particleboard material, compost feedstock, and paper pulp.
• Rural economy: Production supports farmers, labourers, ginning factories, spinning mills, weaving units, garment industries, and exporters.

D. Soil and Climatic Requirements

Cotton requires a warm, frost-free growing period, adequate moisture during establishment, and dry weather during boll opening.

• Temperature:
  • Germination and growth: About 21–30°C is favourable.
  • Reproduction: Persistent temperatures above approximately 35°C or severe moisture stress can increase flower and boll shedding.
• Rainfall: About 500–1,000 mm, well distributed, can support rainfed cotton; waterlogging and prolonged rain during boll opening damage yield and quality.
• Sunshine: Bright sunshine during flowering and boll development promotes photosynthesis and boll maturation.
• Soils:
  • Preferred: Deep, fertile, well-drained black cotton soils and medium-textured alluvial soils.
  • Reaction: A near-neutral to moderately alkaline range, roughly pH 6.0–8.0, is generally suitable.
  • Limitation: Poor drainage causes root injury, nutrient loss, and plant mortality.

E. Varieties

Cultivar selection depends on production zone, irrigation, crop duration, fibre quality, and pest pressure.

• Species groups:
  • Desi cottons: G. arboreum and G. herbaceum are relatively hardy and often better adapted to drought and some sucking-pest pressures.
  • Upland cotton: G. hirsutum varieties and hybrids combine higher yield with medium- to long-staple fibre.
  • Extra-long staple cotton: G. barbadense and interspecific hybrids produce premium-quality fibre but require favourable management.
• Representative cultivars:
  • G. arboreum: AKA-7, PA 255, and LD 327.
  • G. hirsutum: MCU 5, LRA 5166, and Suraj.
  • Hybrids: H-4, DCH-32, and regionally recommended Bt hybrids.
• Bt cotton: Bt hybrids express insecticidal proteins active mainly against bollworm larvae; they do not replace management of whitefly, jassid, aphid, thrips, or diseases.
• Seed choice: Only notified, locally recommended cultivars with verified seed purity and approved insect-resistance traits should be used.

F. Cultural Practices and Yield

Profitable cotton production depends on timely establishment, moisture conservation, balanced plant growth, and integrated pest management.

• Land preparation: Prepare a weed-free, well-drained seedbed; ridges, furrows, or broad-bed-and-furrow systems reduce waterlogging.
• Sowing:
  • Time: April–May under northern irrigation and June–July with monsoon onset in central and southern rainfed areas.
  • Seed rate: Approximately 12–20 kg/ha for varieties and 1.5–3.0 kg/ha of delinted seed for hybrids, depending on seed size and spacing.
  • Spacing: Varieties commonly use about 60–75 × 20–30 cm; hybrids often require 90–120 × 45–60 cm.
• Nutrients: Apply farmyard manure where available and use soil-test-based N–P–K; split nitrogen, especially on irrigated soils, to limit losses and excessive vegetative growth.
• Water management: Flowering and boll development are critical stages; avoid both prolonged drought and standing water.
• Weed control: Keep the crop weed-free during the first 45–60 days through interculture, hand weeding, mulching, or recommended herbicides.
• Plant protection: Monitor economic threshold levels; combine resistant cultivars, seed treatment, biological control, pheromone traps, refuge requirements, and need-based pesticides.
• Harvesting: Hand-pick fully opened, dry bolls in several rounds; keep stained, rain-damaged, and clean seed cotton separate.
• Yield: Rainfed crops commonly produce about 1,000–2,000 kg/ha seed cotton, while well-managed irrigated hybrids may produce 2,500–4,000 kg/ha or more.

III. Jute — The Principal Bast-Fibre Crop

A. Origin

Jute belongs to the genus Corchorus in the family Malvaceae and is represented mainly by white jute and tossa jute.

• White jute: Corchorus capsularis is associated with the Indo-Burma region, including eastern India and adjoining areas.
• Tossa jute: Corchorus olitorius is generally associated with tropical Africa and later spread widely into South Asia.
• Species distinction:
  • C. capsularis: Tolerates low-lying conditions and produces comparatively coarser fibre.
  • C. olitorius: Prefers better-drained land and generally produces stronger, finer, and more lustrous fibre.
• Crop nature: Jute is a fast-growing annual whose fibre is extracted from secondary phloem tissue by retting.

B. Geographical Distribution

Jute is concentrated in humid alluvial regions with abundant rainfall and adequate water for retting.

• World distribution: India and Bangladesh are the principal producers; smaller areas occur in China, Nepal, Myanmar, Thailand, and other humid tropical countries.
• Indian distribution: West Bengal is the leading state, followed by Assam, Bihar, Odisha, Meghalaya, and parts of Uttar Pradesh and Tripura.
• Production belt: The Ganga–Brahmaputra delta is especially favourable because of fertile alluvium, warm humid weather, and accessible retting water.
• Species adaptation: White jute occupies lower and occasionally waterlogged fields; tossa jute performs best on well-drained uplands and medium lands.

C. Economic Importance

Jute is a renewable, biodegradable fibre crop that supports packaging, diversified manufacturing, and rural employment.

• Traditional products: Fibre is made into gunny bags, sacks, hessian cloth, ropes, twine, carpet backing, and agricultural packaging.
• Diversified products: Uses include geotextiles, composites, handicrafts, furnishing fabrics, pulp, paper, and biodegradable consumer goods.
• Environmental value: Jute grows rapidly, produces substantial biomass, and can substitute for some synthetic packaging materials.
• By-products: Jute sticks are used for fuel, fencing, thatching, particleboard, charcoal, and paper pulp.
• Livelihood role: Cultivation, harvesting, retting, fibre extraction, trading, and mill processing provide extensive seasonal employment.

D. Soil and Climatic Requirements

Jute requires a warm, humid climate, reliable soil moisture, and fertile soils for rapid stem elongation.

• Temperature: About 24–35°C is favourable; low temperatures retard germination and early growth.
• Rainfall: Approximately 1,200–1,500 mm with high relative humidity is desirable, although irrigation can compensate for early-season deficits.
• Soils:
  • Preferred: Deep, fertile, well-drained alluvial loam to clay loam soils.
  • Reaction: Roughly pH 6.0–7.5 is suitable.
  • Species response: C. capsularis tolerates poorer drainage and acidity better than C. olitorius.
• Retting requirement: Clean, slow-moving water at about 30–34°C favours microbial retting and good fibre colour.

E. Varieties

Jute varieties are selected according to species, land situation, sowing time, maturity, fibre quality, and disease resistance.

• Tossa jute cultivars: JRO 524, JRO 7835, JRO 8432, and JRO 204 are recognised examples of C. olitorius varieties.
• White jute cultivars: JRC 321, JRC 212, JRC 7447, and JRC 80 represent C. capsularis types.
• Selection criteria:
  • Yield: High dry-fibre production and favourable fibre-to-stick ratio.
  • Quality: Strong, fine, lustrous, uniformly coloured fibre.
  • Adaptation: Suitability to local flooding, drainage, photoperiod, and sowing window.
• Seed standard: Certified seed improves germination, plant uniformity, species purity, and fibre quality.

F. Cultural Practices and Yield

Jute cultivation aims to maintain a dense, uniform stand of tall, unbranched stems and to harvest at the stage giving the best balance of yield and quality.

• Land preparation: Produce a fine, level, firm seedbed because jute seed is small; incorporate well-decomposed organic manure during preparation.
• Sowing:
  • Time: March–May, depending on pre-monsoon rain, irrigation, and species.
  • Seed rate: About 4–5 kg/ha for line-sown tossa and 5–7 kg/ha for line-sown white jute; broadcasting requires more seed.
  • Spacing: Rows are generally 25–30 cm apart, with plants thinned to approximately 5–7 cm within rows.
• Nutrition: A representative range is 40–60 kg N, 20–30 kg P₂O₅, and 20–30 kg K₂O per hectare, adjusted by soil testing; split nitrogen reduces loss.
• Weed and water management: Thin and weed at approximately 15–20 and 30–35 days after sowing; irrigate during establishment if rainfall is inadequate.
• Harvesting: Cut plants near ground level around early pod formation, usually 100–120 days after sowing; earlier cutting improves quality but reduces yield.
• Retting and extraction: Bundle stems, steep them fully under water, test fibre separation periodically, strip the fibre, wash thoroughly, and dry in shade or mild sunlight.
• Yield: Well-managed jute generally produces about 2.0–3.0 t/ha dry fibre and approximately 4–6 t/ha dry sticks.