Unit 4: Crop Production Package of Practices for Kharif Oilseeds

I. Orientation: Kharif Oilseed Production

Kharif oilseeds are crops sown with the onset of the southwest monsoon, generally during June–July, and harvested from September onward. Their productivity depends on timely sowing, suitable varieties, balanced nutrition, weed control, moisture management, plant protection and harvesting at physiological maturity.

• Seasonal character: Groundnut, soyabean, sesame and castor are predominantly warm-season crops; waterlogging is harmful to all four.
• Oil accumulation: Seed oil content is influenced by genotype, temperature, nutrition and moisture during seed development.
• Field establishment: A fine, firm and well-drained seedbed promotes uniform germination and adequate plant population.
• Nutrient principle: Balanced application of nitrogen, phosphorus, potassium and sulphur is preferable to nitrogen alone.
• Legume advantage: Groundnut and soyabean fix atmospheric nitrogen through Rhizobium symbiosis; effective nodulation reduces their external nitrogen requirement.
• Production sequence:
  1. Select locally recommended, certified seed.
  2. Treat seed and sow at the optimum monsoon window.
  3. Maintain crop-specific spacing and plant population.
  4. Control weeds during the first 30–45 days.
  5. Protect flowering and seed-filling stages from moisture stress.
  6. Harvest at maturity and dry produce to safe storage moisture.

II. Groundnut — A Major Edible-Oil and Food Legume

Groundnut (Arachis hypogaea L.) is an annual legume distinguished by geocarpy: flowers develop above ground, but fertilized pegs enter the soil and form pods below the surface.

A. Origin

Groundnut originated in South America and was later dispersed to Africa, Asia and other tropical regions.

• Primary centre: Brazil–Paraguay and adjoining South American regions are associated with its domestication.
• Botanical evidence: The cultivated species is an allotetraploid with chromosome number 2n = 40.
• Indian introduction: Groundnut reached India through historical maritime trade after movement from the Americas to the Old World.

B. Geographical Distribution

Groundnut is concentrated in tropical and subtropical regions with a frost-free growing season.

• World distribution: Major producers include China, India, Nigeria, the United States, Sudan, Myanmar and Argentina.
• Indian distribution: Gujarat, Rajasthan, Andhra Pradesh, Tamil Nadu, Karnataka, Maharashtra, Madhya Pradesh and Telangana are important producing states.
• Production systems: It is cultivated as a rainfed kharif crop, an irrigated rabi crop in southern India and a summer crop under assured irrigation.

C. Economic Importance

Groundnut provides edible oil, protein-rich food, livestock feed and industrial raw materials.

• Kernel composition: Kernels commonly contain about 45–50% oil and 25–30% protein.
• Food uses: Seeds are eaten roasted, boiled or processed into confectionery, peanut butter and protein products.
• By-products: Oilcake is used as organic manure and livestock feed after ensuring freedom from aflatoxin contamination.
• Crop residues: Groundnut haulms are valuable dry fodder; shells serve as fuel, litter and industrial biomass.
• Soil benefit: Biological nitrogen fixation and residue incorporation support soil fertility in crop rotations.

D. Soil and Climatic Requirements

Groundnut performs best in loose, well-drained soil that permits peg penetration and pod expansion.

• Soil: Sandy loam to loam soils with pH about 6.0–7.5 are suitable; heavy clay and saline or waterlogged fields are unsuitable.
• Temperature: Approximately 25–30°C supports germination and vegetative growth.
• Rainfall: A well-distributed 500–1,000 mm is generally adequate, provided drainage is effective.
• Sensitive stages: Flowering, pegging and pod development require adequate moisture; rain near harvest encourages sprouting and disease.

E. Varieties

Varieties are selected according to duration, growth habit, seed type, disease resistance and production environment.

• Spanish bunch types: JL 24, TAG 24 and TMV 2 are comparatively early and suited to close spacing.
• Virginia types: Kadiri 6 and GG 20 have spreading or semi-spreading growth and generally longer duration.
• Improved choices: ICGV 91114 and regionally notified cultivars may provide drought adaptation or disease tolerance.
• Selection rule: Farmers should use varieties officially recommended for the local rainfall zone and disease complex.

F. Cultural Practices and Yield

Successful cultivation requires timely establishment, early weed control and loose soil around the pegging zone.

• Land preparation: Prepare a fine seedbed with effective drainage; broad-bed-and-furrow planting is useful in high-rainfall areas.
• Sowing: Sow with monsoon onset, generally in June–July, using sound kernels treated with fungicide or biocontrol agents, followed by groundnut-specific Rhizobium inoculation.
• Seed rate and spacing:
  • Bunch types commonly require about 100–125 kg kernels/ha at approximately 30 × 10 cm.
  • Spreading types require roughly 80–100 kg/ha at wider row spacing.
• Nutrition: Apply fertilizer according to soil test; phosphorus, calcium and sulphur are especially important. Gypsum around flowering supplies calcium and sulphur to developing pods.
• Weed management: Keep the crop weed-free for 30–45 days through pre-emergence herbicide where recommended and one or two intercultivations; avoid deep hoeing after peg entry.
• Harvest and yield: Harvest when inner pod walls darken and kernels become fully developed. Rainfed crops commonly yield 1.0–2.0 t pods/ha, while well-managed irrigated crops may produce 2.5–3.5 t/ha.

III. Soyabean — A Protein-Rich Oilseed Legume

Soyabean (Glycine max L. Merrill) is an erect annual legume cultivated for seeds rich in both oil and high-quality protein.

A. Origin

Soyabean was domesticated in East Asia from wild relatives of the genus Glycine.

• Centre of origin: China is recognized as the principal centre of origin and early domestication.
• Ancestral species: Cultivated soyabean is closely related to wild Glycine soja.
• Chromosome number: The cultivated crop has 2n = 40.

B. Geographical Distribution

Soyabean is grown across temperate, subtropical and tropical production zones.

• World distribution: Brazil, the United States, Argentina, China and India are major producers.
• Indian concentration: Madhya Pradesh, Maharashtra and Rajasthan form the principal belt, with cultivation also in Karnataka, Telangana, Gujarat and Chhattisgarh.
• Cropping role: It is commonly rotated with wheat, chickpea or other rabi crops.

C. Economic Importance

Soyabean is valued for its exceptional combination of protein and vegetable oil.

• Seed composition: Seed generally contains about 38–42% protein and 18–20% oil.
• Food products: It is processed into soy flour, tofu, soy milk, textured protein and fermented foods.
• Meal: Defatted soy meal is a major protein ingredient in poultry and livestock feed.
• Industrial uses: Oil is used in foods and products such as biodiesel, paints and printing inks.
• Anti-nutritional factors: Heat processing inactivates trypsin inhibitors and improves feeding quality.

D. Soil and Climatic Requirements

Soyabean requires warm conditions, adequate soil moisture and good aeration around the roots.

• Soil: Fertile, well-drained loam to clay loam with pH approximately 6.0–7.5 is preferred.
• Temperature: A range of about 20–30°C is favourable; frost and prolonged high temperature during flowering reduce yield.
• Rainfall: Approximately 600–1,000 mm, well distributed through the season, is suitable.
• Water sensitivity: Waterlogging restricts nodulation and root respiration, while drought at flowering and pod filling causes flower and pod abortion.

E. Varieties

Varietal choice depends on maturity duration, latitude, disease resistance and suitability for local cropping sequences.

• Important cultivars: JS 335, JS 95-60, JS 93-05, NRC 37 and MAUS 71 are established Indian examples.
• Duration: Early varieties fit short rainy seasons; medium-duration varieties may exploit longer moisture availability.
• Resistance needs: Selection should consider yellow mosaic disease, rust, charcoal rot and pod-shattering risk.

F. Cultural Practices and Yield

Soyabean production depends on rapid crop establishment, effective nodulation and a weed-free early growth period.

• Sowing: Sow at dependable monsoon onset, normally June–July, at about 45 × 5–10 cm, adjusted for variety and machinery.
• Seed rate: Approximately 60–75 kg/ha is used to obtain an adequate plant population.
• Seed treatment: Treat against seed- and soil-borne pathogens, then inoculate with compatible Bradyrhizobium japonicum and phosphate-solubilizing microorganisms.
• Nutrition: Apply a small starter dose of nitrogen with soil-test-based phosphorus, potassium and sulphur; excessive nitrogen suppresses nodulation.
• Weed management: The first 30–45 days are critical; use timely hoeing, hand weeding or recommended pre- and post-emergence herbicides.
• Harvest and yield: Harvest when leaves fall and most pods turn brown. Rainfed yield is commonly 1.0–2.0 t/ha; favourable management can produce about 2.5–3.0 t/ha.

IV. Sesame — A High-Quality Oilseed for Dry Environments

Sesame (Sesamum indicum L.) is an erect annual oilseed noted for high-quality, stable oil and adaptation to relatively dry conditions.

A. Origin

Sesame has an ancient history of domestication, with Africa considered the primary centre of diversity and South Asia an important secondary centre.

• Botanical identity: It belongs to the family Pedaliaceae and has chromosome number 2n = 26.
• Historical importance: Archaeological and textual evidence indicates very early cultivation in Asia and Africa.

B. Geographical Distribution

Sesame is cultivated mainly in tropical and subtropical regions.

• World distribution: Sudan, India, Myanmar, Tanzania, China, Nigeria and Ethiopia are important producers.
• Indian distribution: West Bengal, Rajasthan, Uttar Pradesh, Madhya Pradesh, Gujarat, Odisha, Telangana and Tamil Nadu are major areas.
• Seasonal range: It is grown during kharif, semi-rabi, rabi and summer, depending on rainfall and irrigation.

C. Economic Importance

Sesame produces premium edible oil with good storage stability.

• Seed composition: Seeds contain approximately 46–52% oil and 18–25% protein.
• Oil quality: Sesamin, sesamolin and tocopherols contribute antioxidant activity and oxidative stability.
• Uses: Seeds are used in sweets, bakery products, condiments and tahini; oil is used for cooking, pharmaceuticals and cosmetics.
• By-product: Sesame cake is protein-rich feed or manure.

D. Soil and Climatic Requirements

Sesame tolerates drought but is highly susceptible to standing water.

• Soil: Well-drained sandy loam or loam with pH about 5.5–8.0 is suitable.
• Temperature: Warm conditions of approximately 25–35°C favour growth.
• Rainfall: About 400–650 mm can support the crop; heavy rain during flowering or maturity increases disease and lodging.
• Critical limitation: Waterlogging, frost and prolonged cloudiness reduce plant stand and capsule formation.

E. Varieties

Varieties differ in duration, branching, seed colour, capsule number and resistance.

• Indian examples: TKG 22, GT 10, RT 46, TMV 7, Krishna and Pragati are cultivated in suitable regions.
• Market trait: White-seeded types are often preferred for confectionery and export, while oil recovery remains a key processing criterion.
• Local choice: Phyllody, leaf spot and capsule-borer resistance should guide selection.

F. Cultural Practices and Yield

Because sesame seedlings grow slowly, correct seed placement and early weed control are essential.

• Sowing: Sow shallowly at monsoon onset with about 3–5 kg seed/ha; mixing seed with dry sand assists uniform placement.
• Spacing: Maintain approximately 30 × 10–15 cm after thinning.
• Nutrition: Use soil-test-based nitrogen, phosphorus and sulphur; split nitrogen where rainfall permits.
• Weed management: Thin and weed about 15–20 days after emergence, followed by another weeding if required.
• Harvest and yield: Harvest when lower capsules yellow but before widespread shattering. Rainfed yield is commonly 0.4–0.8 t/ha; improved management may produce 1.0–1.5 t/ha.

V. Castor — A Non-Edible Industrial Oilseed

Castor (Ricinus communis L.) is a deep-rooted, often branching oilseed crop grown chiefly for its distinctive industrial oil.

A. Origin

Castor is generally considered to have originated in tropical Africa, particularly the Ethiopia–East Africa region.

• Spread: It subsequently diversified across India and other tropical and subtropical regions.
• Botanical identity: Castor belongs to Euphorbiaceae and has chromosome number 2n = 20.

B. Geographical Distribution

Castor is cultivated in warm, frost-free regions, especially under rainfed conditions.

• World distribution: India is the leading producer and exporter; Brazil, China and Mozambique also cultivate the crop.
• Indian distribution: Gujarat is dominant, followed by Rajasthan, Telangana, Andhra Pradesh and parts of Karnataka and Tamil Nadu.
• Production environment: Deep-rooted plants suit drylands, although commercial yields improve under supplemental irrigation.

C. Economic Importance

Castor oil is a strategic industrial raw material rather than a normal edible oil.

• Oil content: Seeds generally contain about 45–50% oil.
• Distinctive component: Ricinoleic acid forms roughly 85–90% of castor oil fatty acids and gives the oil unusual viscosity and chemical reactivity.
• Industrial uses: Castor oil is used in lubricants, nylon, coatings, cosmetics, pharmaceuticals, hydraulic fluids and biodiesel.
• Safety: Raw seed and untreated cake contain toxic ricin; cake is mainly used as organic manure unless properly detoxified.

D. Soil and Climatic Requirements

Castor requires a long, warm growing season and performs best on deep, well-drained soils.

• Soil: Sandy loam to clay loam soils with good drainage and pH around 6.0–8.0 are suitable.
• Temperature: Approximately 20–30°C favours growth; frost is severely damaging.
• Rainfall: About 500–750 mm is adequate when well distributed.
• Stress response: Established plants tolerate drought, but waterlogging and moisture stress during spike and capsule development reduce yield.

E. Varieties

Castor cultivars include varieties and hybrids selected for yield, maturity, branching and wilt resistance.

• Varieties: 48-1, DCS 9 and Jyoti are recognized examples.
• Hybrids: GCH 4, GCH 7, DCH 177 and DCH 519 are used in appropriate production zones.
• Selection traits: Non-shattering capsules, compact plant type, wilt resistance and synchronized maturity facilitate management and harvesting.

F. Cultural Practices and Yield

Castor requires a wider planting geometry, balanced fertilization and protection of developing spikes.

• Sowing: Sow with the onset of monsoon at about 5–8 kg seed/ha for varieties and lower rates for hybrids.
• Spacing: Common geometries range from 90 × 45 cm to 120 × 60 cm, depending on duration, branching and moisture supply.
• Nutrition: Apply farmyard manure and soil-test-based nitrogen, phosphorus and potassium; split nitrogen under irrigation or reliable rainfall.
• Interculture: Keep fields weed-free during the first 45–60 days through hoeing, hand weeding or recommended herbicides.
• Harvest: Pick spikes in stages when capsules turn brown, then dry and thresh them carefully.
• Yield: Rainfed crops commonly produce 1.0–1.5 t seed/ha; hybrids under good moisture and management may yield 2.0–3.0 t/ha.