Citrus Fertilizer Calculator
Per-tree citrus fertilizer planner — age-based doses up to 600:200:400 g N-P₂O₅-K₂O per tree/year converted into urea, DAP and MOP for your whole orchard.
Three splits: before the spring (ambia) flush, after fruit set, and post-monsoon. Citrus also runs on micronutrient sprays — zinc and iron chlorosis are the constant companions of high-pH orchards.
Indicative planning figures based on published research averages. Local soil tests, varieties and weather change actual requirements — confirm with your agronomist or extension officer.
Orchardists use the free Citrus Fertilizer Calculator to turn the per-tree recommendation into total urea, DAP and MOP for the whole block — young and bearing trees included — without a single hand calculation.
About Citrus Fertilizer Calculator
Citrus feeding is a flush-timed rhythm — and in the kinnow/sweet-orange belts the NPK only works when zinc and iron foliar sprays keep high-pH chlorosis off the canopy. The calculator uses the age-laddered recommendation — 200:50:100 g N-P₂O₅-K₂O per tree/year (1–3 years); 400:130:250 g N-P₂O₅-K₂O per tree/year (4–6 years); 600:200:400 g N-P₂O₅-K₂O per tree/year (7+ years (bearing)) — multiplies it across your tree count, and converts the totals into urea (46% N), DAP (18-46-0) and MOP (0-0-60) quantities for the season.
How to use Citrus Fertilizer Calculator
- 1Enter how many trees you have and choose their age/bearing stage.
- 2Read the total urea, DAP and MOP for the year, plus the per-tree nutrient breakdown.
- 3Follow the split note for when and where to apply each dose.
Why use Citrus Fertilizer Calculator?
- ✓Published per-tree dose ladder for citrus, from planting to full bearing
- ✓Whole-orchard totals — no per-tree mental math
- ✓Automatic conversion to urea, DAP and MOP with the DAP nitrogen credit handled
- ✓Free, instant and fully in-browser — works offline in the orchard
Frequently asked questions
How much fertilizer does a citrus tree need per year?+
1–3 years: 200 g N, 50 g P₂O₅ and 100 g K₂O per tree per year; 4–6 years: 400 g N, 130 g P₂O₅ and 250 g K₂O per tree per year; 7+ years (bearing): 600 g N, 200 g P₂O₅ and 400 g K₂O per tree per year. Three splits: before the spring (ambia) flush, after fruit set, and post-monsoon.
Why do citrus trees on alkaline soil keep yellowing despite fertilizer?+
High-pH soils lock out zinc and iron. Two to three foliar sprays of 0.5% zinc sulphate (+0.25% ferrous sulphate, neutralized with lime) per flush season fix what soil NPK can't.
When are the citrus fertilizer splits applied?+
Ahead of the ambia (spring) flush in Jan–Feb, after fruit set in May–June, and post-monsoon in Sep–Oct — matching root activity peaks under Indian conditions.
How do I convert the per-tree dose into urea, DAP and MOP?+
The tool multiplies the per-tree grams across your count, then sizes DAP to cover P₂O₅ (crediting its 18% N), urea for the remaining N, and MOP for K₂O — the same arithmetic an agronomist would do by hand.
Is this calculator free and private?+
Yes — free, no sign-up, and everything runs in your browser, so your orchard data never leaves the device and the tool works offline.
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