Sulphur
Symptoms
Pale, yellowish young leaves and reduced pungency.
Correction
Sulphur-containing fertilizers in the basal dose or through drip.
Vegetables · Allium cepa
Onion fertilizer and nutrition guide
Early nitrogen, then potassium and sulphur for bigger, firmer bulbs with better storage life.
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About Onion nutrition
Onion is a shallow-rooted crop, so nutrients must be available close to the surface. Nitrogen drives early leaf growth, while potassium and sulphur during bulbing decide bulb size, pungency and storage quality.
- Climate
- Cool weather for leaf growth and warmer, longer days for bulb formation; grown mainly as a rabi and kharif crop in India.
- Soil
- Friable, well-drained loam; pH around 6.0-7.5. Avoid heavy or waterlogged soils.
Stage-wise nutrient management for Onion
What the crop needs most at each growth stage.
Transplanting & establishment
Phosphorus and a basal dose of organic manure for root growth.
Leaf growth
Nitrogen in splits for healthy leaves; sulphur and zinc if soils are low.
Bulb initiation & development
Potassium and sulphur for bulb size, firmness and pungency.
Maturity
Stop nitrogen well before harvest: late nitrogen causes thick necks and poor storage.
Common nutrient deficiencies in Onion
How to recognise them in the field and how they are usually corrected.
Zinc
Symptoms
Twisted, stunted leaves with yellow striping.
Correction
Zinc sulphate in the soil or chelated zinc as a foliar spray.
Potassium
Symptoms
Leaf tip dieback, small soft bulbs with poor storage.
Correction
Potassium-rich fertilizers during bulbing.
Need a Onion fertilizer schedule?
Exact doses depend on your soil test, variety and irrigation. Tell us your crop stage, area and location and we will recommend the right products and quantities.
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