Iron
Symptoms
Yellow young leaves with green veins, common in calcareous soils.
Correction
Chelated iron foliar spray.
Field Crops · Glycine max
Soybean fertilizer and nutrition guide
A legume that fixes its own nitrogen: focus on phosphorus, potassium, sulphur and iron.
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About Soybean nutrition
Soybean is India's leading oilseed crop, grown mainly in kharif in Madhya Pradesh, Maharashtra and Rajasthan. As a legume it fixes much of its own nitrogen, so the priority is phosphorus, potassium, sulphur and micronutrients for pod filling and oil content.
- Climate
- Warm, moist climate, about 20-30 °C, with well-distributed monsoon rainfall.
- Soil
- Well-drained loam to black soils, pH around 6.0-7.5; waterlogging harms nodulation.
Stage-wise nutrient management for Soybean
What the crop needs most at each growth stage.
Sowing & establishment
Phosphorus, potassium and sulphur as a basal dose; only a small starter dose of nitrogen.
Vegetative growth
Iron and zinc where deficient; nodules supply most nitrogen.
Flowering
Boron and potassium for flower and pod retention.
Pod filling
Potassium and sulphur for seed size and oil content.
Common nutrient deficiencies in Soybean
How to recognise them in the field and how they are usually corrected.
Sulphur
Symptoms
Uniform yellowing of young leaves; low oil content.
Correction
Sulphur-containing fertilizers in the basal dose.
Potassium
Symptoms
Yellowing along the edges of older leaves; poor pod filling.
Correction
Potassium in the basal dose.
Recommended application methods for Soybean
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