Watermelon Fertilizer Calculator
Work out the exact urea, DAP and MOP for watermelon from the recommended 120:60:60 kg/ha N-P₂O₅-K₂O dose, adjusted to your soil test and field size.
Half N + full P, K in pits/basins at sowing; rest N in two splits at vining and fruit set. Hold heavy N during fruit swell — water and K, not urea, build size and sweetness then.
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 Watermelon Fertilizer Calculator to convert the official watermelon 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 Watermelon Fertilizer Calculator
Watermelon's plan flips mid-season: nitrogen builds the vine early, but once fruit set begins, potassium and steady water are what pump up size and Brix — late urea just delays ripening. This calculator starts from the published recommendation of 120:60:60 kg/ha N-P₂O₅-K₂O (river-bed / open field), 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 Watermelon 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 Watermelon Fertilizer Calculator?
- ✓Official package-of-practices dose for watermelon — 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 watermelon?+
River-bed / open field: 120 kg N, 60 kg P₂O₅ and 60 kg K₂O per hectare. Half N + full P, K in pits/basins at sowing; rest N in two splits at vining and fruit set.
Which fertilizer makes watermelon sweeter?+
Adequate potassium plus a controlled finish: K moves sugars into the fruit while easing back on N and water in the final 10 days concentrates Brix. Late urea dilutes sweetness.
How do I fertilize watermelon in river-bed (diara) cultivation?+
Concentrate FYM and the basal NPK in each pit since the sandy bed holds nothing; top-dress N near the base at vining and let the deep taproot reach the moisture below.
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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