Foliar Zinc Spray Calculator
Mix zinc sulphate to the right strength (0.5% w/v) for any tank or knapsack volume, with the per-15 L dose worked out for you.
A 0.5% zinc sulphate spray (5 g/L), often neutralised with half its weight of lime to prevent leaf burn, corrects zinc deficiency far faster than soil application — especially on rice and high-pH soils.
Always follow the product label — the label is the law. Verify doses, PHI and compatibility with the manufacturer and local regulations before spraying.
Spray operators use the free Foliar Zinc Spray Calculator to mix exactly the right amount of zinc sulphate into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Foliar Zinc Spray Calculator
Foliar zinc sulphate at 0.5% (5 g per litre), usually softened with half its weight of lime to stop leaf burn, fixes zinc deficiency in days where a soil dose would take a season — vital on rice and calcareous soils. This tool turns the 0.5% spray strength into the grams of zinc sulphate and lime for your tank.
How to use Foliar Zinc Spray Calculator
- 1Enter the concentration (default is the recommended value) and your water volume.
- 2Read the grams of zinc sulphate to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Foliar Zinc Spray Calculator?
- ✓Converts the recommended 0.5% concentration into grams for your exact volume
- ✓Gives the per-15 L knapsack dose automatically
- ✓Estimates the area one tank covers
- ✓Free, instant and fully in-browser — works offline in the field
Frequently asked questions
How do I mix a 0.5% zinc sulphate spray?+
A 0.5% w/v spray means 5.0 g per litre of water, so a 15 L knapsack needs 75 g. The calculator scales this to whatever tank size you enter.
When should I spray for the best result?+
A 0.5% zinc sulphate spray (5 g/L), often neutralised with half its weight of lime to prevent leaf burn, corrects zinc deficiency far faster than soil application — especially on rice and high-pH soils.
Can I increase the concentration to work faster?+
No — going above the recommended 0.5% risks scorching the leaves and wasting product. Repeat sprays at the correct strength instead of one strong one.
Is the tool free and private?+
Yes — free, no sign-up, and it runs entirely in your browser, so it works offline in the field.
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