Fertiliser calculators

A useful collection of calculators to compare the return on investment and margin over fertiliser when using different fertilisers.

Wheat N Response S Barley N Response Value of Grass Nitrate vs Urea NS vs Straight N Compound vs Blend Tropicote Benefit

Nitrogen response on wheat

The optimum rate of nitrogen for wheat depends on the response of the crop to nitrogen, the crop value and the cost of nitrogen. This calculator uses nitrogen response data to calculate the optimum rate of nitrogen at different wheat and nitrogen prices and also calculates the margin over fertiliser cost and return on investment for different applied rates of nitrogen.

The calculations of predicted yield and optimum nitrogen rate are based on actual n-response data derived from 15 years (2005-2021) of n-response trials using ammonium nitrate as the n source, as shown below.

It is possible to use the calculator for other sources of nitrogen such as CAN or liquid fertiliser but if using urea be aware that the nitrogen use efficiency may be reduced resulting in lower than predicted yields (of around 3-5%) which will affect the results.

Recommended nitrate fertilisers

The following YaraBela fertilisers are recommended for all crops and contain nitrogen in the readily available nitrate form.

YaraBela EXTRAN

33.5% N - Granular ammonium nitrate fertiliser suitable for use on all crops.

YaraBela CAN

27% N - Granular calcium ammonium nitrate based nitrogen fertiliser for use on any crop.

YaraBela AXAN

27% N + 9% SO3 - Granular uniform compound nitrate based nitrogen and sulphur fertiliser for use on all crops.

Check out the latest agronomy advice

These articles will help you get even better results from your fertilisers, by keeping you up to date with the latest agronomy advice from the Yara agronomists. If you don't find the advice you are looking for try looking in our full advice archive.