Dryland Winter Wheat Yield, Grain Protein, and Soil Nitrogen Responses to Fertilizer and Biosolids Applications

Figure 3

Postharvest soil profile N (NH₄ + NO₃ for 0 to 0.3 m depth + NO₃ only 0.3 to 1.5 m depth) for the hard red winter wheat treatments from the Lind, Davenport, and Pullman study locations in 2006-2007 (a) and 2007-2008 (b). Error bars represent Least Significant Difference (LSD) values at the 5% level. NS: no significant difference in NO₃-N concentration among treatments for that sampling depth. Note that inorganic N rates were the same for all site-years except Pullman 2007-2008, where N rates were higher. This is reflected in the different legend for that panel.

(a)

(b)