Sum18-13 N x P x K x Cu


To assess the response of wheat to high nitrogen (N) and phosphorus (P) fertilizer inputs.

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

Table 1: Soil Analysis
Figure 1: Yield and Protein Response
Figure 2: Nitrogen and Phosphorus Response Curves


  • In-season observation found growth at the site was being driven by N, with little contribution of P, K or Cu.
  • At harvest, grain yield was high, 2.2 to 5.5 t/ha, and both N and P were found to have promoted grain yield.
  • Application rates of P at 8 to 10 kg/ha and N at 140 to 160 kg/ha optimised yield and profit at the site under the 2018 season conditions.
  • Grain protein production for high-yielding Scepter wheat crops continues to be a challenge with maximum protein concentration of 9.4% seen in the trial at 200 kg N/ha.