Foliar Potassium Nitrate Calculator
Mix potassium nitrate (13-0-45) to the right strength (1% w/v) for any tank or knapsack volume, with the per-15 L dose worked out for you.
A 1% potassium nitrate spray (10 g/L) at fruit development boosts size, colour and Brix in fruit and vegetable crops, supplying clean potassium and a little nitrate-N through the leaf. Several sprays at 10-day intervals.
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 Potassium Nitrate Calculator to mix exactly the right amount of potassium nitrate (13-0-45) into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Foliar Potassium Nitrate Calculator
Potassium nitrate (13-0-45) sprayed at 1% (10 g per litre) during fruit development pushes size, colour and sweetness in fruit and vegetable crops while supplying clean, chloride-free potassium through the leaf. This tool converts the 1% strength into grams of KNO₃ for your tank and counts the knapsack dose.
How to use Foliar Potassium Nitrate Calculator
- 1Enter the concentration (default is the recommended value) and your water volume.
- 2Read the grams of potassium nitrate (13-0-45) to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Foliar Potassium Nitrate Calculator?
- ✓Converts the recommended 1% 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 1% potassium nitrate (13-0-45) spray?+
A 1% w/v spray means 10.0 g per litre of water, so a 15 L knapsack needs 150 g. The calculator scales this to whatever tank size you enter.
When should I spray for the best result?+
A 1% potassium nitrate spray (10 g/L) at fruit development boosts size, colour and Brix in fruit and vegetable crops, supplying clean potassium and a little nitrate-N through the leaf. Several sprays at 10-day intervals.
Can I increase the concentration to work faster?+
No — going above the recommended 1% 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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