Zinc sulphate Calculator
Scale zinc sulphate (21% Zn) to your field, see the Zn delivered, bag count and cost from the recommended 25 kg/ha rate.
Apply zinc sulphate heptahydrate (21% Zn) basal, mixed into soil — never with DAP/phosphate in the same band (P locks up Zn). One soil application typically lasts 2–3 crops.
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 soil-test labs use the free Zinc sulphate Calculator to turn a per-hectare zinc sulphate recommendation into the exact quantity, bag count and cost for their own field in seconds.
About Zinc sulphate Calculator
Zinc is India's most widespread micronutrient deficiency, stunting rice, wheat and maize with white-banded or 'khaira' leaves. Zinc sulphate heptahydrate carries 21% Zn; this tool scales the recommended 12.5–25 kg/ha to your field, reports the actual zinc delivered and the cost, and counts the bags.
How to use Zinc sulphate Calculator
- 1Enter your field area and unit.
- 2Pick the soil rating or situation that matches your soil test.
- 3Read the zinc sulphate quantity, Zn delivered, bags and cost, then follow the application note.
Why use Zinc sulphate Calculator?
- ✓Scales the recommended zinc sulphate rate to hectares, acres or bigha
- ✓Shows the actual Zn nutrient delivered, not just product weight
- ✓Estimates cost and bag count so you can budget the purchase
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How much zinc sulphate per acre?+
Soil test Low Zn: 25 kg/ha (10.1 kg/acre); Marginal: 17 kg/ha (6.9 kg/acre); Maintenance: 12.5 kg/ha (5.1 kg/acre). Apply zinc sulphate heptahydrate (21% Zn) basal, mixed into soil — never with DAP/phosphate in the same band (P locks up Zn).
How much Zn does zinc sulphate contain?+
Zinc sulphate carries about 21% Zn, so each 100 kg supplies 21.0 kg of Zn. The calculator multiplies your applied quantity by this to show the true nutrient delivered.
When and how should I apply it?+
Apply zinc sulphate heptahydrate (21% Zn) basal, mixed into soil — never with DAP/phosphate in the same band (P locks up Zn). One soil application typically lasts 2–3 crops.
Is the tool free and private?+
Yes — free, no sign-up, and all calculation runs in your browser, so it works offline in the field and your data never leaves the device.
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