Nutrient grade and chemical composition
- 48% Sulphur Trioxide (SO3 / 19.2% S): Sulphate sulphur available in readily accessible form, releasing gradually over 50 to 60 days to match crop uptake curves.
- 14% Potash (K2O): Fully water-soluble potassium delivering vital assistance for enzyme activation, stomatal regulation, and carbohydrate transport.
- 6% Magnesium Oxide (MgO): Essential central atom of the chlorophyll molecule, boosting photosynthetic efficiency and green leaf retention.
- 17% Calcium Oxide (CaO): Structural component of plant cell walls, enhancing root strength, fruit firmness, and post-harvest shelf life.
- Low salinity index and ultra-low chloride content make it safe for chloride-sensitive crops.
Gradual release dynamics and soil benefits
Unlike conventional chemical fertilizers that dissolve rapidly and leach below the root zone during heavy irrigation, Polysulphate granules dissolve gradually. This sustained nutrient release pattern reduces sulphur and potassium leaching losses in light sandy soils, providing steady multi-nutrient feeding through critical vegetative and grain-filling stages.
Application timing and organic certification
- Apply as a basal soil dressing during field preparation or early vegetative top-dressing at 100 to 150 kg per hectare.
- Highly beneficial for sulphur-hungry oilseeds (mustard, soybean, groundnut), pulses, potatoes, tea, sugarcane, and fruit orchards.
- Certified as an organic input by international and national organic certification bodies (including OMRI and NPOP standards) due to its 100% natural, unprocessed mineral origin.
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
What four nutrients are contained in ICL Polysulphate?
Polysulphate contains Sulphur (48% SO3), Potassium (14% K2O), Magnesium (6% MgO), and Calcium (17% CaO) in a single natural mineral granule.
Why is Polysulphate advantageous in sandy and high-rainfall soils?
Its prolonged gradual-release dissolution pattern prevents rapid leaching of sulphur and potassium, ensuring steady nutrient availability to crop roots.
Is ICL Polysulphate approved for certified organic farming?
Yes, because it is a natural, unrefined polyhalite mineral mined directly from the earth without chemical processing, it is approved for organic agriculture.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Fertilizers & Crop Nutrition guides
Ask Sakhi AI in your language, check live mandi prices or plan a loan with KisanPe tools.