Loading...
Please wait, while we are loading the content...
Similar Documents
A simple method to predict dissolved phosphorus in runoff from surface-applied manures.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vadas, Peter A. Kleinman, Peter J. A. Sharpley, Andrew N. |
| Copyright Year | 2004 |
| Abstract | Computer models are a rapid, inexpensive way to identify agricultural areas with a high potential for P loss, but most models poorly simulate dissolved P release from surface-applied manures to runoff. We developed a simple approach to predict dissolved P release from manures based on observed trends in laboratory extraction of P in dairy, poultry, and swine manures with water over different water to manure ratios. The approach predicted well dissolved inorganic (R2 = 0.70) and organic (R2 = 0.73) P release from manures and composts for data from leaching experiments with simulated rainfall. However, it predicted poorly (R2 = 0.18) dissolved inorganic P concentrations in runoff from soil boxes where dairy, poultry, and swine manures had been surface-applied and subjected to simulated rainfall. Multiplying predicted runoff P concentrations by the ratio of runoff to rainfall improved the relationship between measured and predicted runoff P concentrations, but runoff P was still overpredicted for dairy and swine manures. We attributed this overprediction to immediate infiltration of dissolved P in the freely draining water of dairy and swine manure slurries upon their application to soils. Further multiplying predicted runoff dissolved inorganic P concentrations by 0.35 for dairy and 0.60 for swine manures resulted in an accurate prediction of dissolved P in runoff (R2 = 0.71). The ability of our relatively simple approach to predict dissolved inorganic P concentrations in runoff from surface-applied manures indicates its potential to improve water quality models, but field testing of the approach is necessary first. |
| Starting Page | 1 |
| Ending Page | 3 |
| Page Count | 3 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://naldc.nal.usda.gov/download/9118/PDF |
| PubMed reference number | 15074829v1 |
| Volume Number | 33 |
| Issue Number | 2 |
| Journal | Journal of environmental quality |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Box Dairy Manure Phosphorus Sensorineural Hearing Loss (disorder) Soil |
| Content Type | Text |
| Resource Type | Article |
