Foliar Urea Spray Calculator
Mix urea to the right strength (2% w/v) for any tank or knapsack volume, with the per-15 L dose worked out for you.
A 2% urea foliar spray (20 g/L) is the standard quick nitrogen boost for pulses, oilseeds and cereals at flowering/grain-fill when the soil is dry. Spray in the cool of evening; don't exceed 2% or leaves scorch.
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 Urea Spray Calculator to mix exactly the right amount of urea into any tank or knapsack — no over- or under-dosing, no leaf burn from guesswork.
About Foliar Urea Spray Calculator
When the topsoil is dry at flowering or grain-fill, soil urea can't be taken up — but a 2% foliar urea spray (20 g per litre) delivers nitrogen straight through the leaf. It's the cheapest late-season rescue for pulses, oilseeds and cereals. This tool converts the 2% strength into grams of urea for your exact tank or knapsack volume.
How to use Foliar Urea Spray Calculator
- 1Enter the concentration (default is the recommended value) and your water volume.
- 2Read the grams of urea to add, plus the per-knapsack dose.
- 3Mix in clean water, agitate, and spray in the cool of the day.
Why use Foliar Urea Spray Calculator?
- ✓Converts the recommended 2% 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 2% urea spray?+
A 2% w/v spray means 20.0 g per litre of water, so a 15 L knapsack needs 300 g. The calculator scales this to whatever tank size you enter.
When should I spray for the best result?+
A 2% urea foliar spray (20 g/L) is the standard quick nitrogen boost for pulses, oilseeds and cereals at flowering/grain-fill when the soil is dry. Spray in the cool of evening; don't exceed 2% or leaves scorch.
Can I increase the concentration to work faster?+
No — going above the recommended 2% 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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