Castor — Package of Practices
A hardy oilseed crop for warm, well-drained land — treat seed against wilt, sow at wide spacing, irrigate at critical stages, and pick the spikes in flushes as capsules mature.
Overview
Castor is a major non-edible oilseed crop; its oil is used widely in industry — lubricants, coatings, soaps, cosmetics and pharmaceuticals.
It is an indeterminate crop: spikes form and mature in flushes, so capsules are picked several times through the season. It is grown both rainfed and irrigated, is drought-hardy once established, but sensitive to frost and waterlogging. Types differ in duration and spike character. No specific cultivar is named here.
Climate & season
Castor needs warm weather (about 20–30 °C) and a long, frost-free season with plenty of sun.
- Mainly grown in the kharif season; also under irrigation.
- It is drought-hardy once established but hit hard by frost and waterlogging.
- A long, warm season suits its flush-by-flush maturity.
Soil & land preparation
A deep, well-drained sandy loam to medium black soil suits castor, at a pH of 6.0–8.0. It tolerates a range of soils but not waterlogging.
- Prepare a deep, well-drained, weed-free seedbed.
- Mix in well-rotted farmyard manure.
- Deep soils give better rooting and drought tolerance.
- Rotate with cereals or pulses to keep wilt low.
Choosing a type & material
Select by crop duration and spike type (compact or spreading). Seed is sown directly, and healthy, treated seed is key against soil-borne wilt and rots. No specific cultivar is named here.
Planting material
- Use fresh, healthy seed of good germination.
- Match duration to your season and water availability.
- Seed rate is about 8–12 kg/ha, depending on spacing and type.
- Reject shrivelled or damaged seed.
Preparation
- Treat seed with fungicide plus a bio-agent against wilt and root rot.
- Soaking seed briefly can hasten and even out germination.
- Sow at 4–6 cm depth into moisture.
- Plan to thin to one healthy plant per hill after emergence.
Planting & spacing
- Prepare a deep, well-drained field and mix in farmyard manure.
- Treat seed with fungicide and bio-agent before sowing.
- Sow on flat or ridges at about 90 × 60 cm (wider for spreading types), 4–6 cm deep.
- Irrigate lightly to establish where needed.
- Gap-fill and thin to one healthy plant per hill.
- Keep the field weed-free through early growth.
Nutrient management
Figures below are a general guide per hectare — castor responds well to nitrogen under irrigation. Adjust to soil test and split nitrogen with the flushes.
| Input | Dose (per ha) | Notes |
|---|---|---|
| Farmyard manure | 8–12 t | Mix in at land preparation Basal |
| Nitrogen (N) | 40–80 kg | Basal plus top-dress with each flush under irrigation Split |
| Phosphorus (P₂O₅) | 40–60 kg | Full dose basal Basal |
| Potassium (K₂O) | as per test | Apply basal where soils are low Basal |
| Sulphur & zinc | as needed | Correct on deficient soils for oil and growth Soil/Foliar |
Water management
Castor is drought-hardy but yields far more with irrigation at critical stages.
- Rainfed in the kharif season; irrigate where water is available.
- Most critical stages are establishment, spike initiation and capsule development.
- Avoid waterlogging, which causes wilt and root rot.
- Reduce irrigation as the main spikes mature for easier picking.
Intercultural & crop management
- Keep the crop weed-free in the first 45–60 days with two or three weedings.
- Earth up around plants for anchorage.
- Castor intercrops well with pulses, using the wide spacing.
- Manage the crop flush by flush — later spikes keep forming after the first pickings.
- Keep fields clean to reduce carry-over of pests and diseases.
Plant protection
| Problem | Type | Watch for | Manage |
|---|---|---|---|
| Semilooper | Pest | Green looping caterpillars stripping leaves to the veins | Handpick early, conserve natural enemies, a recommended insecticide |
| Capsule borer | Pest | Larvae boring spikes and capsules, eating developing seed | Pheromone traps, remove bored capsules, a recommended insecticide |
| Whitefly & jassids | Pest | Sucking pests on leaves; honeydew, sooty mould and virus | Yellow sticky traps, neem, a recommended insecticide |
| Thrips | Pest | Silvery flecks and distortion on leaves and spikes | Blue sticky traps, a recommended insecticide at threshold |
| Fusarium wilt | Disease | Yellowing and wilting with browned internal stem — major disease | Treated seed, resistant types, rotation, avoid stress and injury |
| Grey mould on spikes (Botrytis) | Disease | Grey fungal rot of flowering and developing spikes in humid weather | Spacing, airflow, remove infected spikes, recommended fungicide |
| Root rot | Disease | Sudden drying of plants in patches; rotted roots | Treated seed, drainage, rotation with cereals |
| Leaf & bacterial spots | Disease | Brown or angular spots that spread on leaves | Clean seed, sanitation, avoid overhead wetting |
IPM-first routine
- Start with treated seed on a well-drained, rotated field.
- Keep beds clean and rogue out wilted plants early.
- Scout weekly; use pheromone and sticky traps.
- Favour natural enemies, neem and bio-agents first.
- Use recommended chemicals only at threshold, rotating modes of action.
- Pick and destroy borer-infested capsules to break the cycle.
Use crop-protection inputs safely
Always read the product label and follow it. Use the correct dose — more is not safer or better. Wear protective clothing (gloves, mask, full sleeves) while mixing and spraying, and respect the pre-harvest interval before you pick. Put IPM and cultural methods first and treat chemical sprays as a last resort.
Harvesting & yield
Spikes are picked in flushes as their capsules mature and dry.
- Pick each spike when its capsules turn brown and begin to dry, in the cool morning.
- Harvest in several flushes as successive spikes mature.
- Dry the capsules, then thresh and clean the seed.
- For non-shattering types, time picking to reduce seed loss.
- Typical yield: about 1.5–2.5 t/ha, with irrigated crops at the higher end.
Castor — Package of Practices
A hardy oilseed crop for warm, well-drained land — treat seed against wilt, sow at wide spacing, irrigate at critical stages, and pick the spikes in flushes as capsules mature.
Overview
Castor is a major non-edible oilseed crop; its oil is used widely in industry — lubricants, coatings, soaps, cosmetics and pharmaceuticals.
It is an indeterminate crop: spikes form and mature in flushes, so capsules are picked several times through the season. It is grown both rainfed and irrigated, is drought-hardy once established, but sensitive to frost and waterlogging. Types differ in duration and spike character. No specific cultivar is named here.
Climate & season
Castor needs warm weather (about 20–30 °C) and a long, frost-free season with plenty of sun.
- Mainly grown in the kharif season; also under irrigation.
- It is drought-hardy once established but hit hard by frost and waterlogging.
- A long, warm season suits its flush-by-flush maturity.
Soil & land preparation
A deep, well-drained sandy loam to medium black soil suits castor, at a pH of 6.0–8.0. It tolerates a range of soils but not waterlogging.
- Prepare a deep, well-drained, weed-free seedbed.
- Mix in well-rotted farmyard manure.
- Deep soils give better rooting and drought tolerance.
- Rotate with cereals or pulses to keep wilt low.
Choosing a type & material
Select by crop duration and spike type (compact or spreading). Seed is sown directly, and healthy, treated seed is key against soil-borne wilt and rots. No specific cultivar is named here.
Planting material
- Use fresh, healthy seed of good germination.
- Match duration to your season and water availability.
- Seed rate is about 8–12 kg/ha, depending on spacing and type.
- Reject shrivelled or damaged seed.
Preparation
- Treat seed with fungicide plus a bio-agent against wilt and root rot.
- Soaking seed briefly can hasten and even out germination.
- Sow at 4–6 cm depth into moisture.
- Plan to thin to one healthy plant per hill after emergence.
Planting & spacing
- Prepare a deep, well-drained field and mix in farmyard manure.
- Treat seed with fungicide and bio-agent before sowing.
- Sow on flat or ridges at about 90 × 60 cm (wider for spreading types), 4–6 cm deep.
- Irrigate lightly to establish where needed.
- Gap-fill and thin to one healthy plant per hill.
- Keep the field weed-free through early growth.
Nutrient management
Figures below are a general guide per hectare — castor responds well to nitrogen under irrigation. Adjust to soil test and split nitrogen with the flushes.
| Input | Dose (per ha) | Notes |
|---|---|---|
| Farmyard manure | 8–12 t | Mix in at land preparation Basal |
| Nitrogen (N) | 40–80 kg | Basal plus top-dress with each flush under irrigation Split |
| Phosphorus (P₂O₅) | 40–60 kg | Full dose basal Basal |
| Potassium (K₂O) | as per test | Apply basal where soils are low Basal |
| Sulphur & zinc | as needed | Correct on deficient soils for oil and growth Soil/Foliar |
Water management
Castor is drought-hardy but yields far more with irrigation at critical stages.
- Rainfed in the kharif season; irrigate where water is available.
- Most critical stages are establishment, spike initiation and capsule development.
- Avoid waterlogging, which causes wilt and root rot.
- Reduce irrigation as the main spikes mature for easier picking.
Intercultural & crop management
- Keep the crop weed-free in the first 45–60 days with two or three weedings.
- Earth up around plants for anchorage.
- Castor intercrops well with pulses, using the wide spacing.
- Manage the crop flush by flush — later spikes keep forming after the first pickings.
- Keep fields clean to reduce carry-over of pests and diseases.
Plant protection
| Problem | Type | Watch for | Manage |
|---|---|---|---|
| Semilooper | Pest | Green looping caterpillars stripping leaves to the veins | Handpick early, conserve natural enemies, a recommended insecticide |
| Capsule borer | Pest | Larvae boring spikes and capsules, eating developing seed | Pheromone traps, remove bored capsules, a recommended insecticide |
| Whitefly & jassids | Pest | Sucking pests on leaves; honeydew, sooty mould and virus | Yellow sticky traps, neem, a recommended insecticide |
| Thrips | Pest | Silvery flecks and distortion on leaves and spikes | Blue sticky traps, a recommended insecticide at threshold |
| Fusarium wilt | Disease | Yellowing and wilting with browned internal stem — major disease | Treated seed, resistant types, rotation, avoid stress and injury |
| Grey mould on spikes (Botrytis) | Disease | Grey fungal rot of flowering and developing spikes in humid weather | Spacing, airflow, remove infected spikes, recommended fungicide |
| Root rot | Disease | Sudden drying of plants in patches; rotted roots | Treated seed, drainage, rotation with cereals |
| Leaf & bacterial spots | Disease | Brown or angular spots that spread on leaves | Clean seed, sanitation, avoid overhead wetting |
IPM-first routine
- Start with treated seed on a well-drained, rotated field.
- Keep beds clean and rogue out wilted plants early.
- Scout weekly; use pheromone and sticky traps.
- Favour natural enemies, neem and bio-agents first.
- Use recommended chemicals only at threshold, rotating modes of action.
- Pick and destroy borer-infested capsules to break the cycle.
Use crop-protection inputs safely
Always read the product label and follow it. Use the correct dose — more is not safer or better. Wear protective clothing (gloves, mask, full sleeves) while mixing and spraying, and respect the pre-harvest interval before you pick. Put IPM and cultural methods first and treat chemical sprays as a last resort.
Harvesting & yield
Spikes are picked in flushes as their capsules mature and dry.
- Pick each spike when its capsules turn brown and begin to dry, in the cool morning.
- Harvest in several flushes as successive spikes mature.
- Dry the capsules, then thresh and clean the seed.
- For non-shattering types, time picking to reduce seed loss.
- Typical yield: about 1.5–2.5 t/ha, with irrigated crops at the higher end.