| Abstract: | Plot-scale experimentation can provide valuable insight into the effects of manure management practices on phosphorus (P) runoff, but whole-farm evaluation is needed for complete assessment of potential trade offs. Artificially-applied rainfall experimentation on small field plots and event-based and long-term simulation modeling were used to compare P loss in runoff related to two dairy manure application methods (surface application with and without incorporation by tillage) on contrasting Pennsylvania soils previously under no-till management. Results of single-event rainfall experiments indicated that average dissolved reactive P losses in runoff from manured plots decreased by up to 90% with manure incorporation while total P losses did not change significantly. Longer-term whole farm simulation modeling indicated that average dissolved reactive P losses would decrease by 8% with manure incorporation while total P losses would increase by 77% due to greater erosion from fields previously under no-till. Differences in the two methods of inference point to the need for caution in extrapolating research findings. Single-event rainfall experiments conducted shortly after manure application simulate incidental transfers of dissolved P in manure to runoff, resulting in greater losses of dissolved reactive P. However, the transfer of dissolved P in applied manure diminishes with time. Over the annual time frame simulated by whole farm modeling, erosion processes become more important to runoff P losses. Results of this study highlight the need to consider the potential for increased erosion and total P losses caused by soil disturbance during incorporation. This study emphasizes the ability of modeling to estimate management practice effectiveness at the larger scales when experimental data is not available. |
| Genre: | Article |
| ProdID: | 70033319 |
| Citation Author: | Garcia, A. M.; Veith, T. L.; Kleinman, P. J. A.; Rotz, C. A.; Saporito, L. S. |
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| Citation End Page: | 211 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Soil and Water Conservation |
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| Citation Number Of Pages: | 8 |
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| Citation Search Results Text: | Assessing manure management strategies through small-plot research and whole-farm modeling; 2008; Article; Journal; Journal of Soil and Water Conservation; Garcia, A. M.; Veith, T. L.; Kleinman, P. J. A.; Rotz, C. A.; Saporito, L. S. |
| Citation Start Page: | 204 |
| Citation Volume: | 63 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Assessing manure management strategies through small-plot research and whole-farm modeling; 2008; Article; Journal; Journal of Soil and Water Conservation; Garcia, A. M.; Veith, T. L.; Kleinman, P. J. A.; Rotz, C. A.; Saporito, L. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
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