Major agricultural calcium sources and chemical forms
Different calcium fertilizer products serve distinct agronomic functions depending on soil pH and application methods.
- Calcium Nitrate (15.5% N + 18.8% Ca): Completely water-soluble, provides immediately available calcium and nitrate nitrogen for fertigation.
- Agricultural Gypsum (Calcium Sulphate, ~22% Ca, 18% S): Reclaims sodic soils, improves soil structure, and supplies calcium without altering soil pH.
- Agricultural Lime (Calcium Carbonate): Neutralizes acidic soils, raising pH while supplying structural calcium for crop roots.
- Chelated Calcium (EDTA-Ca): Formulated for rapid foliar uptake during sudden vegetative flushes and fruit set.
Physiological functions in cell wall pectin and plant resilience
Calcium serves as a structural cementing agent in middle lamella pectin, determining plant tissue rigidity and disease resistance.
- Structural cell walls: Calcium pectate binds plant cells together, enhancing physical resistance to fungal and bacterial enzymes.
- Root tip and pollen tube growth: Essential for apical meristem cell division and successful flower pollination.
- Prevention of physiological disorders: Eradicates blossom end rot in tomatoes and peppers, tip burn in cabbage, and bitter pit in apples.
- Post-harvest quality: Extends fruit firmness, decreases storage weight loss, and limits chilling injury in cold storage.
Application methods, soil testing, and mixing care
Broadcast agricultural lime or gypsum during land preparation based on soil health card recommendations. Apply water-soluble Calcium Nitrate through drip fertigation during vegetative and fruiting phases. Never mix Calcium Nitrate with soluble phosphates or sulphates in the same concentrated stock solution tank to prevent insoluble precipitation.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Department of Fertilizers (Govt of India) ↗Related on KisanPe
Common questions
Why is calcium an essential nutrient for vegetable crops?
Calcium builds strong cell walls, promotes root elongation, and prevents physiological disorders like blossom end rot and tip burn.
What is the difference between agricultural gypsum and agricultural lime?
Gypsum supplies calcium and sulfur without raising soil pH (ideal for sodic soils), while lime neutralizes acidic soils to raise pH.
Can Calcium Nitrate be combined with DAP or Potassium Sulphate in fertigation?
No, calcium reacts with phosphates and sulphates to form insoluble gypsum and calcium phosphate, which will clog irrigation emitters.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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