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Bioactive Phosphorus Loss in Simulated Runoff from a Phosphorus-enriched Soil under Two Forage Management Systems
| Content Provider | Semantic Scholar |
|---|---|
| Author | Green, ' Stone, Glenn Cavigelli, ' Baumhardt Devine, ' Although |
| Copyright Year | 2007 |
| Abstract | Although runoff from phosphorus (P)-enriched soils contains more P than the functionally defined molybdate-reactive P, information on the biological significance of the remaining fraction is limited. A study was conducted to characterize distributions ofinorganic and enzyme-labile P forms in simulated runofffrom a silt loam soil (Typic Hapludults) under orchard grass (Dactylis glomerata L.)-red clover (Trifolium pratense L.) and no-till forage-type soybean (Glycine max [L.] Merr.)-wheat (Triticum aestivum L.) systems after the fall harvest. Forage management effects on runoff composition and on relationships between soil water-extractable P (WEP) in runoff and bioactive P pools were determined after eight annual manure applications. Concentration and mass distributions of P forms in runoff over time were lognormally distributed, and four parameters defined the distributions' amplitude and asymmetry. The more inclusive total bioactive P (EDTA-PHP) fraction was found in greater concentration and mass than WEP. Peak concentrations and mass loads we:r:e greater from soil amended with manure P than untreated soil and from soil under orchard grass-clover than soil under soybean-wheat rotation. The strength of correlations between predicted WEP mass loads and soil P pools was in the order EDTA-PHP > ligandexchangeable inorganic P > Mehlich-3P, suggesting that runoff P forms were directly associated with soil available P fractions that were partly derived from enzyme-mediated processes. The results also suggested that knowledge of the P release pattern was as important a factor as mass load because management intensity and yield potentials of these forage systems can alter the characteristics of the loss process. (Soil Science 2007;172:721-732) |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://naldc.nal.usda.gov/naldc/download.xhtml?content=PDF&id=7520 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Dactylis glomerata Ab.IgG:ACnc:Pt:Ser:Qn Edetic Acid Glycine Manure Orchard PHP Phosphorus Sensorineural Hearing Loss (disorder) Soybeans TYPSET and RUNOFF Trifolium pratense Triticum aestivum Water model Wired Equivalent Privacy |
| Content Type | Text |
| Resource Type | Article |
