Rubber Fertilizer Calculator
Work out the exact urea, DAP and MOP for rubber from the recommended 30:30:30 kg/ha N-P₂O₅-K₂O dose, adjusted to your soil test and field size.
Apply in two splits — pre-monsoon (Apr–May) and post-monsoon (Sep–Oct) — in a band around the drip circle. Immature trees get the heavier program to race them to tappable girth.
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 Rubber Fertilizer Calculator to convert the official rubber 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 Rubber Fertilizer Calculator
Rubber flips the usual logic: young untapped trees are fed hardest to reach tappable girth a year or two sooner, while mature tapped stands cruise on a modest maintenance dose. This calculator starts from the published recommendation of 30:30:30 kg/ha N-P₂O₅-K₂O (mature (under tapping)) or 60:40:25 kg/ha N-P₂O₅-K₂O (immature (years 2–7)), 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 Rubber Fertilizer Calculator
- 1Enter your field area and pick the unit (hectare, acre or bigha).
- 2Choose the growing condition (mature (under tapping) / immature (years 2–7)) 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 Rubber Fertilizer Calculator?
- ✓Official package-of-practices dose for rubber — 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 rubber?+
Mature (under tapping): 30 kg N, 30 kg P₂O₅ and 30 kg K₂O per hectare; Immature (years 2–7): 60 kg N, 40 kg P₂O₅ and 25 kg K₂O per hectare. Apply in two splits — pre-monsoon (Apr–May) and post-monsoon (Sep–Oct) — in a band around the drip circle.
Why do immature rubber trees get more fertilizer than tapped ones?+
Every season cut from the 6–7 year immaturity period is pure profit gained. The 60:40:25 immature program accelerates girth; once tapping starts, 30:30:30 maintenance suffices.
Where should fertilizer be placed in a rubber plantation?+
In a weeded band around the drip circle (not against the trunk), forked in lightly before the pre-monsoon rains; on slopes, place it on the uphill side of each tree.
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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