Sum16-05 N & P in Cereals

Is to determine the response of wheat, barley and oats to nitrogen (N) and phosphorus (P) application under the same conditions in the far eastern Wheatbelt.

For further details contact your local Area Manager or the Summit Research Team

Table 1: Soil Analysis
Fig 1: Yield and Protein in Wheat, Yield and Grain Wt in Barley and Oats
Fig 2: Response to Nitrogen and Phosphorus in Wheat, Barley and Oats


  • Overall, N application had a significantly positive effect on wheat yield, improved oats and almost nothing at all for barley.
  • P application had an encouraging effect on yields with all three cereals demonstrating a strong correlation between application rates and increased yields.
  • Highest gross margin for wheat was found when 151$/ha was spent on fertiliser with a return of 680$/ha. Greatest return on oats was seen when $51 was spent with 644$/ha back and for barley at $27 with a return of 594$/ha.