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Residual Effects of Compost and Plowing on Phosphorus and Sediment in Runoff

Dep. of Agronomy and Horticulture, 279 Plant Science, Univ. of Nebraska, Lincoln, NE 68583-0915. Contribution of the Univ. of Nebraska-Lincoln Agricultural Research Division. This research was partly funded by the Hatch Act

View larger version (19K): [in this window] [in a new window]   Fig. 1. Soil P distribution (0–30 cm) in April 2006 as affected by residual compost application, plowing, and compost applied after plowing. Compost treatments are means of the low-P and high-P compost. Horizontal bars on the No Compost treatment are LSD (p < 0.05) for within-depth comparison of control vs. compost-treated soil. Horizontal bars on the RC-P04-C05 treatment are LSD (p < 0.05) for within-depth comparison of compost-treated soil.

View larger version (11K): [in this window] [in a new window]   Fig. 2. The residual effect of compost application, with and without plowing, on runoff losses during 2004 and 2005. The letters indicate differences in runoff volume by ANOVA-protected LSD (p < 0.1) means separation.

View larger version (12K): [in this window] [in a new window]   Fig. 3. The residual effect of compost application, with and without plowing, on sediment losses during 2004 and 2005. The letters indicate differences in sediment loss by ANOVA-protected LSD (p < 0.1) means separation.

View larger version (14K): [in this window] [in a new window]   Fig. 4. The residual effect of compost application, with and without plowing, on particulate, including dissolved, nonreactive P (PP) and dissolved reactive P (DRP) in runoff during 2004 and 2005. Uppercase letters indicate differences in total P loss (DRP + PP) in runoff; Lowercase letters indicate differences in DRP and PP loss by ANOVA-protected LSD (p < 0.1) means separation.