Key facts
From KisanPe's verified data. Confirm prices and doses with the seller, label or official source before acting.
- Suitable crops
- Bt Cotton, Tomato, Banana, Chilli
- Ideal crop stage
- Mid-vegetative to heavy flowering and fruiting
- Common brands
- Mahadhan MagSul, Aries Agro, Coromandel, IFFCO
Nutrient Composition and Biochemical Function
Commercial 25 kg bags of agricultural Magnesium Sulphate are manufactured under the Fertilizer Control Order (FCO) as pure crystalline salts.
Magnesium sits at the molecular center of every chlorophyll molecule, functioning as the primary solar energy harvester for crop photosynthesis.
Sulfur acts synergistically to drive the synthesis of essential amino acids and aromatic oils, making MgSO4 a vital dual-action nutrient supplement.
- Magnesium (9.6% Mg): Central metallic ion of chlorophyll and cofactor for phosphate transfer enzymes
- Sulfur (12% S): Essential for oil synthesis and protein building in pulses and oilseeds
- 100% water solubility: Dissolves cleanly without grit, making it ideal for foliar misting and micro-irrigation fertigation
Deficiency Symptoms and Target Crops
Magnesium deficiency displays as prominent interveinal chlorosis on older lower leaves, where leaf veins remain green while interveinal areas turn yellow, bronze, or reddish.
It is widely applied in intensive cash crops, fruit orchards, and vegetables cultivated under high potassium or ammonium fertilization, which restricts magnesium uptake.
- Cotton and pulses: Prevents leaf reddening and premature lower leaf drop
- Tomatoes and vegetables: Eliminates interveinal yellowing, supporting sustained fruit sizing
- Fruit orchards: Prevents leaf scorch and promotes uniform fruit maturity in citrus, banana, and grapes
Application Guidelines, Fertigation, and Soil Testing
MgSO4 can be broadcast into soil during basal field preparation, injected through micro-irrigation lines, or applied as a foliar mist.
Foliar feeding delivers immediate corrective therapy when high soil potassium blocks root magnesium absorption.
Coordinate applications with Soil Health Card recommendations for balanced crop nutrition.
- Drip fertigation: Injected through drip tanks at recommended concentrations per irrigation cycle
- Foliar spray: Dissolve in clean water and spray evenly across foliage upon noticing early interveinal yellowing
- Compatibility: Compatible with most soluble fertilizers; avoid mixing with highly concentrated phosphates in concentrated stock tanks
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
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Common questions
What nutrients are provided by a 25 kg bag of Magnesium Sulphate?
It provides two essential secondary plant nutrients: 9.6 percent magnesium (Mg) and 12 percent sulfur (S) in completely water-soluble form.
Why is Magnesium Sulphate applied to cotton crops?
In cotton, it cures magnesium deficiency known as leaf reddening, preserving active photosynthetic leaves for heavy boll retention.
Can Magnesium Sulphate be applied through drip irrigation?
Yes, its complete water solubility allows it to dissolve cleanly without leaving sediment that could clog drip emitters.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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