Dryland Winter Wheat Yield, Grain Protein, and Soil Nitrogen Responses to Fertilizer and Biosolids Applications
Figure 4
Net changes in total inorganic soil N in a 1.5-m profile between the preplant (Table 1) and postharvest soil sampling of selected fertility treatments in hard red winter wheat at the Lind, Davenport, and Pullman study locations in 2006-07 (a) and 2007-08 (b). Values in the positive (right of vertical line) represent a net gain in soil profile inorganic N compared to the initial (preplant) sampling while values in the negative (left of the vertical line) represent a new depletion of soil profile N. Note the differences in inorganic N application rate between Lind/Davenport and Pullman in 2007-08.
