To assess the response of wheat to nitrogen (N) and phosphorus (P), whilst examining the longevity effect of soil amelioration activities, deep ripping and liming.
There was a strong in-season biomass and yield response to applied N. Despite the low P status of the site, there was a weak response to applied P.
The high fertilizer treatment (120 kg N/ha & 24 kg P/ha), had the highest in-season plant growth and harvest yield, but did not maximise gross margins.
Yield ranged between 0.6-2t/ha and was low considering the favourable rainfall conditions.
Profits were not reflective of the higher grain prices, due to poor grain quality and yield.
The most profitable treatment of $440/ha was 120 kg N/ha and 18 kg P/ha, which also optimised yield.