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Fig. 2. Soil NO3–N (mg kg–1) in a Stellar soil as affected by biosolids rate, season of biosolids application, soil depth, and sampling date in 1997 and 1998. Biosolids were applied in 1997. Rate means within a season of application followed by the same lowercase letter are not significantly different (P > 0.05). Season of application means within a rate followed by the same uppercase letter are not significantly different (P > 0.05); n = 10. Figures lacking mean separation letters indicate corresponding nonsignificant effects. Solid lines represent biosolids application in the dormant season; dashed lines represent biosolids application in the growing season. Data are back-transformed means from natural log-transformed data.
