Dryland Winter Wheat Yield, Grain Protein, and Soil Nitrogen Responses to Fertilizer and Biosolids Applications
Figure 1
The effect of inorganic N fertilizer and biosolids on yield and grain protein content of three wheat market classes at Lind (a), Davenport (b), and Pullman (c), Wash in 2007. The horizontal axis (N rate) is the same for each graph panel. Due to large differences in grain yield, the vertical axis changes for each market class site (column). Where indicated by the regression line, quadratic or linear responses are significant at . * and ** indicate significant differences at the 0.10 and 0.05 level, respectively, between inorganic N and biosolids treatments at that inorganic nitrogen and biosolids rate.
