Reading the grade
The numbers are % N, % P₂O₅ and % K₂O. For example, a 50 kg bag of 10:26:26 contains 5 kg nitrogen, 13 kg P₂O₅ and 13 kg K₂O. A four-number grade such as 20:20:0:13 also includes sulphur.
Common grades and typical use
- 10:26:26 and 12:32:16: complex fertilizers mainly used as a basal dose at sowing.
- 20:20:0:13 (ammonium phosphate sulphate): supplies N, P and sulphur.
- 19:19:19: fully water-soluble, used for fertigation through drip or as a foliar spray.
- Other water-soluble grades such as 0:52:34 and 13:0:45 are used at specific crop stages.
Choosing the right grade
- Match the grade to your soil test: if phosphorus is high, a high-P grade may be wasted.
- Use complex granular grades at sowing and water-soluble grades for drip or sprays.
- Follow the dose for your crop from your Soil Health Card or agriculture officer.
Official source
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Soil Health Card portal ↗Related on KisanPe
Common questions
What does 19:19:19 mean?
19% nitrogen, 19% P₂O₅ and 19% K₂O, in a fully water-soluble form for drip or foliar use.
Is 10:26:26 good for all crops?
It suits crops and soils that need more phosphorus and potassium at sowing; your soil test should guide the choice.
How do I calculate nutrient quantity?
Multiply the bag weight by the percentage: a 50 kg bag of 12:32:16 has 6 kg N, 16 kg P₂O₅ and 8 kg K₂O.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More Fertilizers & Crop Nutrition guides
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