Major water-soluble fertilizer grades and uses
Formulated under the Fertilizer Control Order (FCO) with specific NPK ratios matching crop growth stages.
- Balanced Grades (19-19-19 / 20-20-20): Used during vegetative growth to support uniform root, stem, and leaf canopy development.
- High-Phosphorus Grades (12-61-00 / 00-52-34): Applied during early root establishment, flower bud initiation, and bloom retention.
- High-Potassium Grades (13-00-45 / 00-00-50): Applied during fruit setting, tuber enlargement, and grain filling to enhance fruit size, sugar content, and shelf life.
- Specialty Nitrogen Grades (13-40-13 / Calcium Nitrate): Applied for cellular cell wall strength, blossom-end rot prevention, and vegetative flushes.
Advantages over conventional broadcast fertilizers
Water-soluble nutrition ensures that applied fertilizers are absorbed rather than lost to the environment.
- High Nutrient Use Efficiency (NUE): WSF achieves 80% to 90% nutrient absorption compared to 30% to 50% for broadcast granular fertilizers.
- Zero Drip Clogging: 100% water solubility prevents physical clogging of dripper labyrinths, micro-tubes, and spray nozzles.
- Precision Fertigation: Farmers can split fertilizer doses daily or weekly according to real-time crop growth stage demands.
- Low Salt Index: Formulated free of harmful chlorides and sodium, reducing the risk of soil salinity and root tip scorch.
Application techniques and fertigation safety
Adhering to proper tank mixing protocols prevents chemical precipitation in irrigation pipelines.
- Two-Tank System: Separate calcium-containing fertilizers (Tank A) from phosphate and sulfate fertilizers (Tank B) to prevent insoluble precipitates.
- Foliar Spraying: Spray during cooler morning or evening hours with clean water; adhere to recommended concentration (usually 0.5% to 1.0%).
- Flush Lines: Run clean water through drip lines for 10 to 15 minutes after fertigation to flush out any chemical residues.
- Base total fertilizer programs on Soil Health Card recommendations and specific crop nutrient removal rates.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Department of Fertilizers (Ministry of Chemicals & Fert) ↗Related on KisanPe
Common questions
What is the primary benefit of water-soluble fertilizers in drip systems?
They dissolve 100% in water without leaving sand or insoluble sludge, delivering nutrients directly to plant roots without clogging drip emitters.
Why should Calcium Nitrate not be mixed with 00-52-34 in the same tank?
Mixing calcium with phosphate in concentrated stock solutions causes a chemical reaction forming insoluble calcium phosphate, creating sludge that blocks emitters.
Are water-soluble fertilizers suitable for foliar spraying?
Yes, high-purity water-soluble fertilizers are specifically designed for both drip fertigation and foliar feeding on field and horticultural crops.
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.