Part of a series of trials to assess wheat response to nitrogen and potassium under different conditions across the wheatbelt and, locally, determine rates to improve yield and returns.

• Both N and K have influenced wheat growth at the site, to varying degrees.
• Summit’s complex soil test interpretation model recommended 90 kg N for a 3 T/ha wheat crop based on the soil sample analyses at this site. With a growing season rainfall of 300 mm and the responses in this trial, an N recommendation of 80 kg/ha appears appropriate.
• Potassium recommendations from the Summit model were 20 kg K for a 3 T/ha wheat crop. Potassium recommendations will be much more dependent on soil characteristics and laboratory test results, but even on the duplex soil at the site, 10 to 20 kg K/ha looks to be of benefit in helping plants to maximise the potential growth benefits from top-up nitrogen applications.
• Mace wheat utilises N nutrition for yield, on the whole, but protein does increase somewhat with increasing N application and targeting higher delivery grades is possible if desired.