Soybean Fertilizer Calculator
Work out the exact urea, DAP and MOP for soybean from the recommended 30:60:40 kg/ha N-P₂O₅-K₂O dose, adjusted to your soil test and field size.
Entire dose drilled basal at sowing, 5 cm below seed. Treat seed with rhizobium + PSB culture; the crop fixes its own N after the starter dose. Add 20 kg S/ha on S-deficient soils.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Farmers and agronomists use the free Soybean Fertilizer Calculator to convert the official soybean recommendation into exact urea, DAP and MOP quantities for their own field in seconds — no agronomy tables, no spreadsheet, and it works offline in the field.
About Soybean Fertilizer Calculator
Soybean's fertilizer plan is phosphorus-led: P drives nodulation and pod set while the 30 kg starter N only bridges the gap until rhizobia begin fixing — more urea actually hurts. This calculator starts from the published recommendation of 30:60:40 kg/ha N-P₂O₅-K₂O (kharif (normal)), adjusts it ±25% for your soil-test N, P and K ratings, scales it to your field area in hectares, acres or bigha, and converts the nutrients into real products — urea (46% N), DAP (18-46-0) and MOP (0-0-60) — including the number of bags to buy.
How to use Soybean Fertilizer Calculator
- 1Enter your field area and pick the unit (hectare, acre or bigha).
- 2Choose the growing condition and your soil-test ratings for N, P and K — leave Medium if you have no recent soil test.
- 3Read off the urea, DAP and MOP quantities and bag counts, then follow the split-application note for timing.
Why use Soybean Fertilizer Calculator?
- ✓Official package-of-practices dose for soybean — not a generic NPK guess
- ✓Soil-test Low/Medium/High ratings adjust the dose ±25% automatically
- ✓Converts nutrients to urea, DAP and MOP bags, with the DAP nitrogen credit handled correctly
- ✓Works in hectares, acres and bigha — and runs fully in your browser, even offline in the field
Frequently asked questions
What is the recommended fertilizer dose for soybean?+
Kharif (normal): 30 kg N, 60 kg P₂O₅ and 40 kg K₂O per hectare. Entire dose drilled basal at sowing, 5 cm below seed.
Why is the nitrogen dose for soybean so low?+
Well-nodulated soybean fixes 60–80% of its own N. The 30 kg/ha starter only feeds the crop until nodules activate (~3 weeks); heavier N suppresses nodulation and wastes money.
Should I treat soybean seed with rhizobium every year?+
Yes — seed inoculation with Bradyrhizobium japonicum (plus PSB) costs almost nothing and reliably improves nodulation, especially in fields that haven't grown soybean recently.
How does the calculator convert NPK into urea, DAP and MOP?+
DAP (46% P₂O₅) is sized to cover the phosphorus need; the nitrogen it also carries (18% N) is credited against the N requirement, and urea (46% N) supplies the balance. MOP (60% K₂O) covers potassium. Bag counts use 45 kg urea and 50 kg DAP/MOP bags.
Is this tool free, and does my data leave the device?+
It is completely free with no sign-up, and all calculation happens in your browser — nothing you enter is uploaded, so it also works offline in the field.
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