Soybean — Package of Practices
A leading kharif oilseed legume — handle the fragile seed gently, ensure sharp drainage, and keep watch for rust and the girdle beetle.
Overview
Soybean is a leading kharif oilseed legume grown for oil and high-protein meal. It fixes nitrogen and needs warm weather with sharp drainage.
The seed is fragile and must be handled and sown carefully; rust and a handful of borers and defoliators are the main protection concerns.
Climate & season
Soybean likes warm weather (about 20–30 °C) and is a rainy-season crop.
- A kharif crop, mostly rainfed.
- Sensitive to frost and to waterlogging.
- Needs good rainfall distribution through pod-fill.
Soil & land preparation
Best on a well-drained loam to clay loam at pH 6.0–7.5.
- Prepare a fine, well-drained seedbed.
- Mix in 8–10 t/ha farmyard manure.
- Open drainage channels in heavy soils.
Choosing a type & seed
Choose a duration suited to your rainfall; use fresh, high-germination seed. No specific cultivar is named here.
Seed rate
- About 60–75 kg/ha.
- Sow 3–4 cm deep.
- Handle the brittle seed gently to protect germination.
Seed treatment
- Treat with a recommended fungicide, then Rhizobium (and a phosphate-solubiliser where used).
- Aids stand and fixation.
Sowing & spacing
- Sow with the onset of the monsoon into moist soil.
- Keep rows 30–45 cm apart.
- Space plants 5–10 cm within the row.
- Sow shallow (3–4 cm); avoid hard seed drops that crack the seed.
- Ensure quick drainage from the start.
Nutrient management
As a legume the crop fixes much of its own nitrogen, so give only a light starter dose with good phosphorus; a Rhizobium seed treatment improves fixation.
| Input | Dose | Notes |
|---|---|---|
| Farmyard manure | 8–10 t/ha | Basal |
| Nitrogen (N) | 20–30 kg/ha | Light starter only |
| Phosphorus (P₂O₅) key | 60–80 kg/ha | Full basal |
| Potash (K₂O) | 40 kg/ha | Basal |
| Sulphur | Apply if deficient | Boosts oil content |
Water management
Mostly rainfed, but drainage matters as much as moisture.
- Most sensitive at flowering and pod filling.
- Give a protective irrigation then in a dry spell.
- Drain excess water promptly — soybean hates wet feet.
Weed management
- The first 45 days are the critical weed-free period.
- Use a recommended pre-emergence herbicide with one weeding.
- A clean early crop closes canopy and smothers later weeds.
Plant protection
| Problem | Type | Watch for | Manage |
|---|---|---|---|
| Girdle beetle | Pest | Two girdling rings on the stem; wilting above | Remove affected shoots, recommended insecticide at threshold |
| Stem fly | Pest | Tunnelled stems, weak seedlings | Treated seed, timely sowing |
| Defoliators (Spodoptera, semilooper) | Pest | Stripped leaves | Pheromone traps, Bt or recommended insecticide if severe |
| Whitefly | Pest | Spreads yellow mosaic | Yellow traps, manage early |
| Rust | Disease | Tan pustules on the underside of leaves | Tolerant types, recommended fungicide on appearance |
| Yellow mosaic / bacterial pustule | Disease | Yellow mottling; raised pustules | Clean seed, control whitefly, rogue affected plants |
| Charcoal rot | Disease | Lodging, grey shredded pith in dry heat | Avoid moisture stress, balanced nutrition |
- Sow treated seed of a tolerant type on time.
- Scout from early growth; manage rust as soon as it appears.
- Conserve natural enemies and control whitefly early.
- Spray only at the threshold, following the label.
Use crop-protection inputs responsibly
Read the label, use the recommended dose, wear protective gear while spraying, and strictly observe the pre-harvest (waiting) interval before picking — on crops harvested repeatedly this matters at every picking. Prefer cultural and biological methods first and spray only when monitoring shows it is needed.
Harvesting & yield
Harvest when the leaves have dropped and the pods rattle with hard, dry seed, generally 90–110 days.
- Thresh gently to avoid cracking the seed; dry for storage.
- Yields of about 2–3 t/ha are achievable with good management.
Related crops
Soybean — Package of Practices
A leading kharif oilseed legume — handle the fragile seed gently, ensure sharp drainage, and keep watch for rust and the girdle beetle.
Overview
Soybean is a leading kharif oilseed legume grown for oil and high-protein meal. It fixes nitrogen and needs warm weather with sharp drainage.
The seed is fragile and must be handled and sown carefully; rust and a handful of borers and defoliators are the main protection concerns.
Climate & season
Soybean likes warm weather (about 20–30 °C) and is a rainy-season crop.
- A kharif crop, mostly rainfed.
- Sensitive to frost and to waterlogging.
- Needs good rainfall distribution through pod-fill.
Soil & land preparation
Best on a well-drained loam to clay loam at pH 6.0–7.5.
- Prepare a fine, well-drained seedbed.
- Mix in 8–10 t/ha farmyard manure.
- Open drainage channels in heavy soils.
Choosing a type & seed
Choose a duration suited to your rainfall; use fresh, high-germination seed. No specific cultivar is named here.
Seed rate
- About 60–75 kg/ha.
- Sow 3–4 cm deep.
- Handle the brittle seed gently to protect germination.
Seed treatment
- Treat with a recommended fungicide, then Rhizobium (and a phosphate-solubiliser where used).
- Aids stand and fixation.
Sowing & spacing
- Sow with the onset of the monsoon into moist soil.
- Keep rows 30–45 cm apart.
- Space plants 5–10 cm within the row.
- Sow shallow (3–4 cm); avoid hard seed drops that crack the seed.
- Ensure quick drainage from the start.
Nutrient management
As a legume the crop fixes much of its own nitrogen, so give only a light starter dose with good phosphorus; a Rhizobium seed treatment improves fixation.
| Input | Dose | Notes |
|---|---|---|
| Farmyard manure | 8–10 t/ha | Basal |
| Nitrogen (N) | 20–30 kg/ha | Light starter only |
| Phosphorus (P₂O₅) key | 60–80 kg/ha | Full basal |
| Potash (K₂O) | 40 kg/ha | Basal |
| Sulphur | Apply if deficient | Boosts oil content |
Water management
Mostly rainfed, but drainage matters as much as moisture.
- Most sensitive at flowering and pod filling.
- Give a protective irrigation then in a dry spell.
- Drain excess water promptly — soybean hates wet feet.
Weed management
- The first 45 days are the critical weed-free period.
- Use a recommended pre-emergence herbicide with one weeding.
- A clean early crop closes canopy and smothers later weeds.
Plant protection
| Problem | Type | Watch for | Manage |
|---|---|---|---|
| Girdle beetle | Pest | Two girdling rings on the stem; wilting above | Remove affected shoots, recommended insecticide at threshold |
| Stem fly | Pest | Tunnelled stems, weak seedlings | Treated seed, timely sowing |
| Defoliators (Spodoptera, semilooper) | Pest | Stripped leaves | Pheromone traps, Bt or recommended insecticide if severe |
| Whitefly | Pest | Spreads yellow mosaic | Yellow traps, manage early |
| Rust | Disease | Tan pustules on the underside of leaves | Tolerant types, recommended fungicide on appearance |
| Yellow mosaic / bacterial pustule | Disease | Yellow mottling; raised pustules | Clean seed, control whitefly, rogue affected plants |
| Charcoal rot | Disease | Lodging, grey shredded pith in dry heat | Avoid moisture stress, balanced nutrition |
- Sow treated seed of a tolerant type on time.
- Scout from early growth; manage rust as soon as it appears.
- Conserve natural enemies and control whitefly early.
- Spray only at the threshold, following the label.
Use crop-protection inputs responsibly
Read the label, use the recommended dose, wear protective gear while spraying, and strictly observe the pre-harvest (waiting) interval before picking — on crops harvested repeatedly this matters at every picking. Prefer cultural and biological methods first and spray only when monitoring shows it is needed.
Harvesting & yield
Harvest when the leaves have dropped and the pods rattle with hard, dry seed, generally 90–110 days.
- Thresh gently to avoid cracking the seed; dry for storage.
- Yields of about 2–3 t/ha are achievable with good management.