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Crop Nitrogen Demand and Grain Protein Concentration of Spring and Winter Wheat

Crop Dev. Cent., Univ. of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada

View larger version (24K): [in a new window]   Fig. 1. Grain yield and protein concentration response to N fertilizer for five spring wheat genotypes grown under partial irrigation at Saskatoon in 1994. The peak four-parameter Weibull equation was employed to describe the grain yield response, and the sigmoidal four-parameter Gompertz equation was used to describe the grain protein concentration response to N fertilizer applications.

View larger version (18K): [in a new window]   Fig. 2. Relationships between grain yield and protein concentration for AC Reed and Katepwa grown under partial irrigation at Saskatoon in 1994 and 1998, respectively. Grain protein concentration at maximum grain yield and 90 an 80% of maximum grain yield was estimated using the peak three-parameter log normal equation.