Unit 4: Crop Production Package of Practices for Kharif Oilseeds - Subjective Questions

Origin:

• Groundnut, or peanut, is believed to have originated in South America, particularly in the region of Peru and adjoining areas.
• It belongs to the family Fabaceae and is scientifically known as Arachis hypogaea.

Geographical distribution:

• It is widely cultivated in tropical and subtropical regions.
• In India, important groundnut-growing states include Gujarat, Andhra Pradesh, Tamil Nadu, Rajasthan, Karnataka, Maharashtra, Madhya Pradesh, and Uttar Pradesh.

Economic importance:

• Groundnut kernels contain approximately 45–50% oil and 25–30% protein.
• The oil is used for cooking, manufacture of soap, cosmetics, paints, and lubricants.
• Kernels are consumed roasted, boiled, or processed into peanut butter and confectionery products.
• Groundnut cake is a valuable protein-rich cattle feed and organic manure.
• The haulms are nutritious fodder for livestock.
• Being a legume, groundnut contributes nitrogen to the soil through biological nitrogen fixation.

Soil requirements:

• Groundnut grows best in loose, well-drained sandy loam or loam soils.
• Light-textured soils facilitate penetration of pegs and easy harvesting of pods.
• The optimum soil reaction is generally between pH 6.0 and 7.5.
• Heavy clay, waterlogged, saline, and alkaline soils are unsuitable because they restrict peg penetration and pod development.
• Adequate calcium in the pod zone is essential for proper seed formation.

Climatic requirements:

• It is a warm-season crop requiring a temperature of about 25–30°C for good growth.
• A frost-free growing period with moderate rainfall is desirable.
• Approximately 500–1,000 mm of well-distributed rainfall is generally suitable.
• Dry weather during maturity and harvesting is beneficial.
• Excessive rainfall at maturity may cause rotting, sprouting, and difficulty in harvesting.
• Bright sunshine promotes photosynthesis and proper development of pods and kernels.

Important varieties:

• Commonly cultivated varieties include JL-24, TAG-24, GG-2, GG-20, Kadiri-6, Kadiri-9, TMV-2, TMV-7, and ICGV 91114.
• Selection of a variety should depend on duration, rainfall, soil type, disease resistance, and market preference.

Cultural practices:

• Prepare a fine, loose, and well-pulverized seedbed with good drainage.
• Use healthy, mature, and disease-free kernels or pods for sowing.
• Treat seed with suitable fungicides and biofertilizers such as Rhizobium where recommended.
• Sow at the beginning of the monsoon or under irrigation according to the recommended season.
• Maintain proper spacing, commonly about 30 cm between rows and 10 cm between plants, depending on the type.
• Apply nutrients based on soil-test results, with special attention to phosphorus, sulphur, and calcium.
• Keep the field weed-free during the first 35–45 days through interculture and hand weeding.
• Earth up lightly or maintain loose soil to support peg penetration.
• Control insect pests and diseases using integrated pest-management practices.
• Stop irrigation before harvest and harvest when leaves turn yellow and the inner shell develops dark markings.

Flowering and pegging:

• Groundnut flowers are produced above the ground on branches.
• After fertilization, the flower stalk elongates and forms a structure called a peg or gynophore.
• The peg bends downward and penetrates the soil.
• Pod development takes place below the soil surface.

Importance of earthing up:

• Earthing up keeps the soil loose around the plant base.
• It helps pegs enter the soil easily and improves pod setting.
• It supports better development of pods and reduces the number of unfilled pods.
• It improves aeration and drainage in the pegging zone.
• Excessive earthing up should be avoided because it may damage roots and disturb developing pods.

Other management points:

• Adequate moisture is essential during flowering, pegging, and pod filling.
• Calcium availability in the pegging zone is important for sound kernel development.
• Weed competition during pegging can seriously reduce yield.

Maturity indices:

• Leaves become yellow and begin to shed.
• The inner surface of the pod shell develops characteristic brown or black markings.
• Kernels become fully developed and attain the typical varietal colour.
• The crop usually matures in about 100–150 days, depending on the variety and season.

Harvesting:

• Harvesting is done by pulling, lifting, or digging the plants when most pods are mature.
• The plants are inverted and left in the field for partial drying.
• Pods are separated manually or by mechanical threshers.

Post-harvest handling:

• Pods should be dried properly to reduce moisture and prevent fungal growth.
• They should be cleaned, graded, and stored in dry, well-ventilated conditions.
• Kernels damaged by insects or mould should be removed because mould may produce aflatoxin.

Yield:

• Yield varies with variety, soil, rainfall, and management.
• Under good rainfed conditions, about 1.5–2.5 tonnes of pods per hectare may be obtained, while irrigated and well-managed crops can produce higher yields.

Origin:

• Soybean originated in East Asia, especially China.
• It belongs to the family Fabaceae and is scientifically known as Glycine max.

Geographical distribution:

• It is cultivated extensively in China, the United States, Brazil, Argentina, India, and several other countries.
• In India, major soybean-producing states include Madhya Pradesh, Maharashtra, Rajasthan, Karnataka, Telangana, Gujarat, and Andhra Pradesh.

Economic importance:

• Soybean seeds contain about 35–40% protein and 18–22% oil.
• Soybean oil is used as edible oil and in the manufacture of industrial products.
• Soybean meal is an important high-protein feed for poultry, livestock, and fish.
• It is processed into milk, tofu, flour, textured vegetable protein, and other food products.
• Soybean is a valuable source of plant protein for human nutrition.
• As a legume, it fixes atmospheric nitrogen and improves soil fertility when properly inoculated with compatible Bradyrhizobium cultures.

Soil requirements:

• Soybean performs well in fertile, well-drained loam to clay-loam soils.
• Soils should have good water-holding capacity without prolonged waterlogging.
• A soil pH of about 6.0–7.5 is generally suitable.
• Highly saline, strongly acidic, and poorly drained soils reduce nodulation and crop growth.
• Adequate phosphorus, sulphur, and micronutrients are important for root development, nodulation, and seed formation.

Climatic requirements:

• Soybean is a warm-season crop requiring a temperature of about 20–30°C.
• It needs a frost-free growing period.
• Moderate and well-distributed rainfall, generally around 600–1,000 mm, is suitable.
• Moisture is especially important during flowering, pod formation, and seed filling.
• Excess moisture causes poor aeration, root diseases, and yellowing of plants.
• Dry weather during maturity helps the crop dry and permits timely harvesting.
• Day length influences flowering because soybean varieties differ in photoperiod response.

Important varieties:

• Important varieties include JS 335, JS 95-60, JS 20-29, NRC 37, NRC 86, MAUS 71, MAUS 81, RKS 45, and Punjab 1.
• Varieties should be selected according to maturity duration, regional adaptation, disease resistance, and seed quality.

Package of practices:

• Prepare a level and well-drained seedbed with adequate moisture.
• Use certified, healthy seed with good germination capacity.
• Treat seed with suitable fungicide and inoculate it with a compatible soybean-specific Bradyrhizobium culture.
• Sow with the onset of monsoon at the recommended depth and spacing, commonly about 30–45 cm between rows.
• Apply fertilizers according to soil-test recommendations, particularly phosphorus, sulphur, and potassium where deficient.
• Maintain timely weed control during the first 30–45 days using interculture, hand weeding, or approved herbicides.
• Provide drainage during heavy rainfall.
• Monitor and manage defoliators, girdle beetle, stem fly, pod borers, rust, yellow mosaic, and other important problems through integrated practices.
• Harvest when most leaves have fallen and pods are mature but before excessive shattering.
• Dry seed to safe moisture before storage.

Seed treatment:

• Seed treatment protects emerging seedlings from seed-borne and soil-borne pathogens.
• It improves germination and establishes a uniform plant population.

Inoculation:

• Soybean seed should be inoculated with a compatible Bradyrhizobium culture.
• The bacteria form nodules on roots and fix atmospheric nitrogen.
• Effective nodulation improves plant nutrition and may reduce the requirement for external nitrogen fertilizer.

Weed management:

• Soybean is weak against weeds during early growth.
• Weeds compete for light, nutrients, water, and space and may harbour pests.
• The field should be kept weed-free during the critical period of about 20–45 days after sowing.
• Intercultivation, hand weeding, and recommended pre- or post-emergence herbicides can be integrated.

Water management:

• Soybean requires adequate moisture during flowering, pod setting, and seed filling.
• Waterlogging should be prevented through surface drainage.
• Irrigation may be supplied during prolonged dry spells, but excessive irrigation should be avoided near maturity.

Maturity symptoms:

• Leaves turn yellow and gradually fall.
• Pods become mature, dry, and attain the characteristic colour of the variety.
• Seeds become hard and develop their normal size and colour.

Harvesting:

• The crop should be harvested when most pods are mature and before serious pod shattering occurs.
• Plants may be cut close to the ground using a sickle or harvested mechanically.
• Harvesting during early morning can reduce shattering losses because pods may retain slight moisture.

Post-harvest management:

• Plants are dried, threshed, and the seed is cleaned and graded.
• Seed should be dried to safe moisture content before storage.
• Storage structures must be dry, clean, and protected from insects and rodents.
• Damaged, diseased, and immature seeds should be removed.

Yield:

• Average yield depends on variety, rainfall, soil fertility, and crop management.
• A well-managed soybean crop may produce approximately 1.5–2.5 tonnes of seed per hectare under common field conditions.

Both crops improve soil fertility through biological nitrogen fixation, but they differ greatly in pod development, oil concentration, and adaptation to soil type.

Origin:

• Sesame is one of the oldest oilseed crops and is generally believed to have originated in Africa, with India also considered an important centre of diversity and domestication.
• It belongs to the family Pedaliaceae and is scientifically known as Sesamum indicum.

Geographical distribution:

• Sesame is cultivated in tropical and subtropical regions of Asia, Africa, and Latin America.
• In India, it is grown in Gujarat, Rajasthan, Uttar Pradesh, Madhya Pradesh, Maharashtra, Tamil Nadu, Karnataka, Andhra Pradesh, Telangana, and West Bengal.

Economic importance:

• Sesame seed contains approximately 45–55% high-quality oil and about 18–25% protein.
• Sesame oil is edible, stable, and valued for its good keeping quality.
• The seeds are used in sweets, bakery products, confectionery, chutney, and traditional foods.
• Sesame cake is used as cattle feed and manure, although its feeding value depends on processing.
• The crop is important for small and marginal farmers because it has a short duration and can fit into different cropping systems.
• Sesame oil and seed products also have pharmaceutical and cosmetic uses.

Soil requirements:

• Sesame grows best in well-drained sandy loam, loam, or light alluvial soils.
• It does not tolerate prolonged waterlogging.
• A soil pH of approximately 5.5–8.0 may be tolerated, although near-neutral soils are preferred.

Climatic requirements:

• It requires warm conditions with temperatures around 25–35°C.
• Moderate rainfall of about 500–700 mm, distributed during vegetative growth, is suitable.
• Dry weather during maturity is essential because excessive rain causes capsule shattering and seed deterioration.

Important varieties:

• Varieties include TKG 22, RT 46, RT 127, GT 2, Gujarat Til 3, Krishna, YLM 66, TMV 7, and VRI 1.

Cultural practices:

• Prepare a fine, firm, and weed-free seedbed because sesame seed is small.
• Use clean, healthy seed and sow shallowly in rows at the recommended spacing.
• Mix seed with dry sand or fine soil for uniform distribution.
• Apply farmyard manure and fertilizers according to soil-test recommendations.
• Thin excess seedlings to maintain a proper plant population.
• Control weeds during the early growth period through hand weeding or approved herbicides.
• Provide drainage and protect the crop from insect pests and diseases.
• Harvest when lower capsules turn yellow and before extensive shattering.

Harvesting stage:

• Sesame matures unevenly from the lower capsules upward.
• The crop is harvested when the lower leaves turn yellow, most capsules become yellowish, and the lower capsules begin to open.
• Harvesting should be done before full capsule dehiscence to prevent seed loss.

Harvesting method:

• Plants are cut near the ground, tied into small bundles, and stacked upright or placed on a clean surface for drying.
• After drying, bundles are shaken or beaten gently to release the seed.
• The seed is cleaned and dried thoroughly.

Importance of timely harvesting:

• Delayed harvesting causes capsule shattering and substantial seed loss.
• Harvesting too early results in immature, shrivelled, and low-quality seed.
• Dry weather at harvest improves seed quality and reduces fungal contamination.

Yield:

• Sesame generally produces about 400–800 kg seed per hectare under rainfed conditions, while improved management and favourable conditions can produce higher yields.

Storage:

• Seed should be dried to safe moisture content and stored in clean, moisture-proof containers.

Origin:

• Castor is believed to have originated in tropical Africa, particularly Ethiopia.
• It belongs to the family Euphorbiaceae and is scientifically known as Ricinus communis.

Geographical distribution:

• It is cultivated in tropical, subtropical, and warm temperate regions.
• India is a major castor-producing country, with Gujarat and Rajasthan being important producing states. It is also grown in Andhra Pradesh, Telangana, Karnataka, Tamil Nadu, and Maharashtra.

Economic importance:

• Castor seed contains approximately 45–55% oil.
• Castor oil has unique chemical properties and is used in lubricants, paints, varnishes, plastics, resins, soaps, cosmetics, pharmaceuticals, and aviation and industrial products.
• Hydrogenated castor oil is used in several industrial applications.
• Castor cake is used mainly as organic manure because it may contain toxic compounds and should be used cautiously as animal feed.
• The leaves may be used for rearing eri silkworms in suitable regions.
• Castor is valued as a drought-tolerant crop and can provide income under relatively dry conditions.

Soil requirements:

• Castor grows well in deep, fertile, well-drained loam, sandy loam, and clay-loam soils.
• It can tolerate moderately poor soils and some moisture stress better than many other oilseed crops.
• Deep soils are preferred because castor develops a strong root system.
• Waterlogged soils are unsuitable because they cause poor root growth and diseases.
• The crop can tolerate a moderately wide soil pH range, approximately 6.0–8.0.

Climatic requirements:

• It requires warm weather, generally with temperatures of about 20–30°C.
• A frost-free period is essential.
• It can be grown with moderate rainfall, commonly about 500–750 mm, if moisture is distributed adequately.
• Moisture is important during establishment, flowering, and capsule development.
• Dry weather during maturity helps capsule drying and harvesting.

Suitability for dryland agriculture:

• Its deep root system enables it to extract moisture from lower soil layers.
• It has comparatively good drought tolerance and can withstand intermittent dry periods.
• Its long duration and branching habit allow effective use of available moisture.
• Proper moisture conservation, timely weed control, and suitable plant population are necessary for stable yields.

Important varieties and hybrids:

• Important castor cultivars include GCH 4, GCH 5, DCH 177, DCS 9, 48-1, Jyoti, Aruna, and Pragathi.
• Hybrids are often preferred because they provide higher seed yield and better uniformity.

Cultural practices:

• Prepare a deep, well-drained seedbed and conserve soil moisture in rainfed areas.
• Use healthy, bold, and disease-free seed.
• Treat seed with recommended fungicides to protect seedlings from soil-borne diseases.
• Sow at the onset of monsoon or under irrigation at the recommended spacing; wider spacing is used for branching hybrids.
• Apply farmyard manure and balanced fertilizers based on soil-test results.
• Split application of nitrogen may improve growth and reduce losses.
• Control weeds during the early crop period through interculture, hand weeding, or recommended herbicides.
• Thin excess plants and maintain the recommended plant population.
• Remove unwanted or diseased branches and monitor the crop for semilooper, capsule borer, whitefly, and diseases such as wilt and grey mould.
• Harvest mature racemes in stages rather than waiting for the entire plant to mature.

Harvesting:

• Castor capsules mature in succession, beginning with the primary raceme and followed by secondary and later racemes.
• Racemes are harvested when capsules turn brown or dry and show the signs of maturity.
• Harvesting should be done in several pickings to reduce shattering and maintain seed quality.
• Gloves should be used during handling because plant parts may cause irritation and the seeds contain toxic compounds.

Threshing and drying:

• Harvested racemes are dried in the sun and threshed by beating or mechanical methods.
• Seed is cleaned, graded, and dried to safe moisture content.
• Storage areas should be dry, clean, and protected from moisture and pests.

Yield:

• Seed yield varies according to hybrid, plant population, soil fertility, rainfall, and management.
• Rainfed crops may yield about 1.0–1.8 tonnes per hectare, while well-managed irrigated hybrids can produce 2.0 tonnes per hectare or more.

Safety:

• Castor seed should not be used directly as food or ordinary animal feed because it contains toxic ricin.
• Processing of castor seed and cake must follow appropriate safety practices.

Both crops require good drainage and dry weather at maturity. However, sesame is more prone to shattering, whereas castor is better adapted to moisture stress and is harvested progressively.

Meaning:

• Integrated nutrient management combines organic manures, chemical fertilizers, biofertilizers, crop residues, and efficient application methods.

Importance in groundnut:

• Phosphorus supports root growth and nodulation.
• Calcium and sulphur are important for pod and oil development.
• Organic manure improves soil structure and peg penetration.

Importance in soybean:

• Seed inoculation with compatible Bradyrhizobium improves biological nitrogen fixation.
• Phosphorus, sulphur, and potassium support nodulation, flowering, and seed filling.
• Excessive nitrogen fertilizer may reduce nodulation and is therefore avoided unless deficiency is confirmed.

Importance in sesame:

• Balanced nitrogen promotes vegetative growth without causing excessive lodging.
• Phosphorus and sulphur support root development, flowering, capsule formation, and oil synthesis.
• Organic manures improve moisture retention and nutrient availability.

Importance in castor:

• Adequate nitrogen is required for vigorous branching and raceme development.
• Phosphorus and potassium improve root growth, flowering, and stress tolerance.
• Split fertilizer application improves nutrient-use efficiency.

General benefits:

• Improves yield, oil content, soil fertility, nutrient-use efficiency, and long-term sustainability.