Magnesium
Symptoms
Reddening of older leaves while veins stay green.
Correction
Magnesium sulphate foliar spray.
Field Crops · Gossypium spp.
Cotton fertilizer and nutrition guide
Boron and magnesium for square and boll retention, potassium for boll weight and fibre quality.
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About Cotton nutrition
Cotton is a major kharif cash crop in India. Shedding of squares and bolls is a key yield loss, and balanced nutrition, especially boron, magnesium and potassium during flowering and boll development, improves boll retention, boll weight and fibre quality.
- Climate
- Warm climate, about 21-30 °C, with a long frost-free season and dry weather at boll opening.
- Soil
- Deep black cotton soils or well-drained alluvial soils, pH around 6.0-8.0.
Stage-wise nutrient management for Cotton
What the crop needs most at each growth stage.
Sowing & establishment
Phosphorus and a basal dose of NPK for roots.
Vegetative growth & squaring
Nitrogen in splits; sulphur and zinc where soils are low.
Flowering & boll formation
Boron and magnesium to reduce shedding; potassium for boll growth.
Boll development & opening
Potassium for boll weight and fibre quality; avoid late nitrogen.
Common nutrient deficiencies in Cotton
How to recognise them in the field and how they are usually corrected.
Boron
Symptoms
Heavy square and boll shedding, deformed bolls.
Correction
Foliar boron at squaring and flowering.
Potassium
Symptoms
Leaf bronzing and premature leaf fall; small bolls.
Correction
Potassium fertilizers before and during boll development.
More field crops guides
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