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Fertilizer dosage calculator
Fertilizer Dosage Calculator (All Crops)
Calculate fertilizer requirement for any crop using recommended NPK values and optional soil test results
Crop Information
Recommended Nutrient Requirement (kg/ha)
Soil Test Values (Optional – kg/ha)
Crop-wise Recommended NPK Values (kg/ha)
Click a crop to auto-fill the fertilizer calculator above.
| Crop | N (Nitrogen) | P₂O₅ (Phosphorus) | K₂O (Potassium) |
|---|---|---|---|
| Wheat | 120 | 60 | 40 |
| Rice (Paddy) | 140 | 60 | 50 |
| Maize | 150 | 70 | 60 |
| Cotton | 150 | 60 | 60 |
| Sugarcane | 250 | 100 | 120 |
| Potato | 180 | 90 | 120 |
| Tomato | 150 | 80 | 100 |
| Onion | 100 | 50 | 80 |
| Chili | 120 | 60 | 60 |
| Mustard | 100 | 50 | 40 |
Note: These are general recommendations. Actual fertilizer requirements may vary based on soil fertility, crop variety, climate, and local guidelines.
How This Fertilizer Calculator Works
This fertilizer dosage calculator helps farmers calculate the correct amount of fertilizers required for any crop based on nutrient needs and soil fertility.
Every crop requires three major nutrients for healthy growth and optimum yield:
- Nitrogen (N) – promotes leaf growth and green color
- Phosphorus (P₂O₅) – supports root development and early plant growth
- Potassium (K₂O) – improves plant strength, disease resistance, and crop quality
Instead of guessing fertilizer quantities, this calculator uses scientific nutrient-based calculations to give accurate results.
Calculation Method Used
- Enter crop name (any crop can be used)
- Enter recommended Nitrogen (N), Phosphorus (P₂O₅), and Potassium (K₂O) values in kg/ha
- Optional soil test values are subtracted from total crop nutrient requirements
- The remaining nutrient requirement is fulfilled using:
- Urea (46% Nitrogen)
- DAP (18% Nitrogen + 46% Phosphorus)
- MOP (60% Potassium)
- The calculator automatically adjusts Nitrogen supplied through DAP
- Final fertilizer quantities are displayed in kg per hectare (kg/ha)
This ensures balanced fertilization and prevents over-application.
Why Use This Calculator?
- ✔ Works for all crops
- ✔ Based on nutrient requirement method
- ✔ Reduces fertilizer wastage
- ✔ Saves input cost
- ✔ Improves crop yield
- ✔ Supports soil test-based recommendations
Important Advisory:
This calculator provides general guidance only.
Always follow recommendations from your local agricultural extension service or soil testing laboratory.
Frequently Asked Questions (FAQ)
What is a fertilizer calculator?
A fertilizer calculator is a digital tool that helps farmers determine the correct quantity of fertilizers required for crops based on nutrient demand and soil fertility.
Which fertilizers are used in this calculator?
This calculator uses Urea (46% Nitrogen), DAP (18% Nitrogen + 46% Phosphorus), and MOP (60% Potassium).
Can I use this calculator for any crop?
Yes. You can enter nutrient recommendations for any crop including cereals, vegetables, oilseeds, pulses, and cash crops.
How does soil testing improve accuracy?
Soil test values show how much Nitrogen, Phosphorus, and Potassium are already available in the soil. The calculator subtracts these values to avoid over-fertilization.
In which unit are fertilizer quantities shown?
All fertilizer quantities are displayed in kg per hectare (kg/ha).
Is this calculator a replacement for expert advice?
No. This calculator provides general guidance only. For best results, always consult your local agricultural extension service or soil testing laboratory.
