Mustard
Mustard (Rai/Sarso) Cultivation Guide: Sowing, Seed Rate & Care
Step-by-step rabi mustard (rai/sarso) cultivation — soil and seedbed, sowing time, seed rate and spacing, thinning, irrigation, sulphur nutrition and aphid management for a high-yield oilseed crop.
By the Varsha Seeds Agronomy Team · Updated Fri Jul 03
Mustard (rai/sarso) is the workhorse rabi oilseed — short-duration, hardy and largely rainfed, thriving on conserved moisture where few other oilseeds do. It turns on three simple levers: timely sowing, correct thinning for plant population, and enough sulphur to fill oil-rich seed.
Soil and seedbed preparation
Mustard grows on a wide range of soils but prefers well-drained loam to sandy loam with good moisture-holding. It tolerates mild salinity better than most oilseeds but not waterlogging. Prepare a fine, firm, level seedbed — because the seed is tiny, a cloddy bed gives a patchy stand. Conserve moisture during preparation, as the crop is often grown on residual moisture.
Sowing time, seed rate and spacing
- Season: rabi — sow mid-October to mid-November
- Seed rate: ~4–5 kg/ha (mix with fine sand for even sowing)
- Spacing: about 45 cm between rows × 10–15 cm between plants (after thinning)
- Depth: 2–3 cm — shallow, because the seed is very fine
Sow shallow into moist soil for quick, even emergence. Because so little seed goes a long way, distribution is the challenge — mixing with dry sand is the simplest fix.
Thinning — the step most farmers skip
Mustard is nearly always sown too thick. Thin the crop at 15–20 days to the correct plant-to-plant spacing. Thinning is the single highest-return operation in mustard: overcrowded plants give thin, poorly filled spikes, while a correctly spaced stand branches and fills far better.
Irrigation
Mustard is often rainfed, but where water is available, one or two light irrigations lift yield sharply. Protect the two key stages:
| Stage | Why it matters |
|---|---|
| Pre-flowering / branching | Builds branches and flowering sites |
| Siliqua (pod) filling | Sets seed size, yield and oil content |
Avoid heavy irrigation, which lodges the crop and encourages disease.
Nutrition — don't forget sulphur
Apply nitrogen, phosphorus and potash on a soil-test basis, splitting nitrogen between sowing and the first irrigation. Above all, give mustard sulphur (about 20–40 kg/ha on deficient soils) — it is a sulphur-loving oilseed, and sulphur directly raises both seed yield and oil percentage.
Pest and disease management
- Mustard aphid: the major pest — it colonises spikes at flowering and podding. Scout closely and spray a recommended insecticide on threshold; late-sown crops are hit hardest.
- Alternaria blight and white rust: manage with clean seed, timely sowing and a recommended fungicide if pressure builds.
Harvesting
Harvest when the siliquae turn yellow-brown and the lower leaves shed, before pods dry enough to shatter. Cut, windrow to dry, then thresh promptly to protect seed and oil quality.
Putting it together
Sow on time into a fine, firm bed, thin to the right population, feed sulphur, protect flowering and pod filling, and stay ahead of aphids. See the mustard pillar guide, compare oilseeds in castor and mustard as the best rabi oilseeds, and consider Mishva research mustard for a dependable, high-oil crop.
Frequently Asked Questions
When is mustard sown?
Mustard is a rabi crop, sown from mid-October to mid-November. Timely sowing is important — late-sown mustard flowers into rising temperatures and suffers heavier aphid attack, both of which cut yield.
What is the seed rate for mustard?
Use only about 4–5 kg/ha of mustard seed. It is very small-seeded, so mix it with fine sand for even distribution and thin the crop to the correct spacing at 15–20 days to avoid overcrowding.
Why is sulphur important for mustard?
Mustard is a sulphur-loving oilseed — adequate sulphur raises both seed yield and oil content. Applying 20–40 kg/ha of sulphur on deficient soils is one of the most reliable ways to lift a mustard crop.
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