Tomato Fertilizer Calculator
Work out the exact urea, DAP and MOP for tomato from the recommended 180:100:60 kg/ha N-P₂O₅-K₂O dose, adjusted to your soil test and field size.
Basal: half N + full P + half K at transplanting. Top-dress remaining N and K in two splits at 30 and 50 days. Add calcium (gypsum or Ca-nitrate) where blossom-end rot is a problem.
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 Tomato Fertilizer Calculator to convert the official tomato 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 Tomato Fertilizer Calculator
Hybrid tomatoes carrying 8–10 trusses need roughly 50% more NPK than open-pollinated types, and steady K supply is what builds fruit colour, firmness and uniform ripening. This calculator starts from the published recommendation of 180:100:60 kg/ha N-P₂O₅-K₂O (hybrid) or 120:80:50 kg/ha N-P₂O₅-K₂O (open-pollinated), 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 Tomato Fertilizer Calculator
- 1Enter your field area and pick the unit (hectare, acre or bigha).
- 2Choose the growing condition (hybrid / open-pollinated) 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 Tomato Fertilizer Calculator?
- ✓Official package-of-practices dose for tomato — 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 tomato?+
Hybrid: 180 kg N, 100 kg P₂O₅ and 60 kg K₂O per hectare; Open-pollinated: 120 kg N, 80 kg P₂O₅ and 50 kg K₂O per hectare. Basal: half N + full P + half K at transplanting.
What fertilizer prevents blossom-end rot in tomato?+
Blossom-end rot is a calcium-supply problem aggravated by drought and excess N. Keep moisture even, avoid N spikes, and supply calcium via gypsum at planting or 0.5% calcium-nitrate foliar sprays during fruit set.
Do hybrid tomatoes really need a higher dose?+
Yes — a hybrid carrying continuous trusses for 4–5 months removes far more nutrients than a determinate OP type, so packages step the dose up from about 120:80:50 to 180:100:60 kg/ha.
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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