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Applied and Environmental Soil Science
Volume 2014 (2014), Article ID 147818, 7 pages
http://dx.doi.org/10.1155/2014/147818
Research Article

Sediment, Nutrient, and Bacterial Runoff from Biosolids and Mineral Fertilizer Applied to a Mixed Cool- and Native Warm-Season Grassland in the Ozark Mountains

1Missouri State University, P.O. Box 291, Isabella, MO 65676, USA
2William H. Darr School of Agriculture, Missouri State University, 901 S. National Avenue, Springfield, MO 65897, USA
3Missouri State Staff, USDA Natural Resources Conservation Service State Office, Parkade Center, Suite 250, 601 Business Loop 70 West, Columbia, MO 65203-2546, USA

Received 30 July 2013; Accepted 28 November 2013; Published 29 January 2014

Academic Editor: Silvana Irene Torri

Copyright © 2014 Cody B. Wallace et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Rainfall simulations were conducted within mixed (cool- and native warm-season) grasslands in the sloping, rocky soils typical of the Ozark Mountains region to estimate nutrient and bacteria levels in runoff from biosolids and mineral fertilizer (MF). The ability of narrow (1 m) vegetated filter strips (VFS) to reduce losses was evaluated. Experiment 1 included an untreated control (C); 37 kg plant available nitrogen (PAN) ha−1 from biosolids applied to the upslope half of the plot with the downslope half serving as a VFS (LBF); 74 kg PAN ha−1 from biosolids, with VFS (HBF); and a uniform biosolids application at the lower rate and no VFS (LBU). Experiment 2 examined runoff from MF applied at 89 kg ammoniacal nitrogen (NH4-N) ha−1 and 147 kg phosphorous (P) ha−1 over the whole plot (MFW) or only on the upslope half (with VFS) (MFF). No significant differences were detected among mean fecal coliform levels despite large differences in magnitude. Losses of NH4-N and P were greater for LBU than for LBF. Although only marginally significant ( ), total phosphorous contained in runoff was nearly three times higher in MFW than in MFF. Results of this study suggest that even a small VFS can potentially reduce nutrient levels in runoff.