Long-Term Dynamics of Labile and Stable Phosphorus Following Poultry Litter Application to Pasture Soils

摘要

A major source of runoff phosphorus (P) from agricultural soils is land-applied animal manure. Our work reports P levels in pasture soils in northern Alabama affected by long-term (0-20 years) application of poultry litter (PL). Sequential fractionation revealed different buildup patterns of labile and stable P fractions in these soils. Phosphorus built up in subsurface (20-40 cm and 40-60 cm deep) soils with lower application rates than P accumulated in surface (0-20 cm deep) soils, indicating a greater potential for surface runoff than leaching from these pasture fields. Correlation analysis of the surface soils showed levels of stable P extractable by sodium hydroxide (NaOH) were related to the cumulative amount of PL applied. The level of water-extractable P increased because PL application was significantly related to the number of years the soil receiving PL, not the annual application rate or the cumulative amount of PL applied.View full textDownload full textKeywordsOrganic phosphorus, pasture soil, poultry litter, sequential fractionation, soil phosphorusRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; var addthis_config = {"data_track_addressbar":true,"ui_click":true}; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00103624.2012.728262