Foliar Iron Spray Calculator
Mix ferrous 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% ferrous sulphate spray (5 g/L), repeated weekly, greens up iron-chlorotic young leaves on calcareous soils where soil iron is useless. Adding a little citric acid keeps the iron soluble in the tank.
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 Iron Spray Calculator to mix exactly the right amount of ferrous sulphate into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Foliar Iron Spray Calculator
On calcareous soils, iron applied to the soil locks up instantly, so iron chlorosis — yellow young leaves with green veins — is corrected through the leaf instead. A 0.5% ferrous sulphate spray (5 g per litre), repeated weekly, restores green. This tool converts that strength into grams of ferrous sulphate for your tank.
How to use Foliar Iron Spray Calculator
- 1Enter the concentration (default is the recommended value) and your water volume.
- 2Read the grams of ferrous sulphate to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Foliar Iron 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% ferrous 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% ferrous sulphate spray (5 g/L), repeated weekly, greens up iron-chlorotic young leaves on calcareous soils where soil iron is useless. Adding a little citric acid keeps the iron soluble in the tank.
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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