The optimum rate of nitrogen for spring barley 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.
Optimum N Rate
Comparison N Rate
The calculations of predicted yield and optimum nitrogen rate are based on actual n-response data derived from 10 years (2011-2021) 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.
The following YaraBela nitrate-based fertilisers are recommended
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.