Click on image to view larger version.
Fig. 3. Soil NO3–N (mg kg–1) in a Stellar soil as affected by biosolids rate, season of application, mulch, and irrigation (top figures: non-irrigated; bottom figures: irrigated) in August 1998. Biosolids were applied in 1998. Rate means within a season of application, mulch and irrigation level followed by the same lowercase letter (a, b, c) are not significantly different (P > 0.05). Season of application means within a rate, mulch, and irrigation followed by the same capital letter (A, B) are not significantly different (P > 0.05). Mulch means within a rate, season of application, and irrigation followed by the same lowercase letter (x, y) are not significantly different (P > 0.05). n = 20. Solid lines represent dormant season application; dashed lines represent growing season application. Data are back-transformed means from natural log-transformed data.
