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Forms of Phosphorus in Soil Receiving Cattle Feedlot Waste
Author(s) -
Sharpley A. N.,
Smith S. J.,
Stewart B. A.,
Mathers A. C.
Publication year - 1984
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1984.00472425001300020007x
Subject(s) - feedlot , loam , sorghum , surface runoff , chemistry , zoology , agronomy , mineralization (soil science) , environmental chemistry , phosphorus , sorption , soil water , environmental science , soil science , adsorption , biology , ecology , organic chemistry
Cattle feedlot waste (FLW) was applied (176 to 1614 Mg ha −1 ) to irrigated continuous‐grain sorghum [ Sorghum bicolor (L.) Moench] grown on Pullman clay loam (Torrertic Paleustolls) over an 8‐y period. The FLW applications increased the total, inorganic, organic, and available P content and decreased the P sorption index of surface soil (0–30 cm). Amounts of P in the surface soil were highly correlated with the total amount of FLW‐P applied and time since the last application. The proportion of total P as inorganic P increased (34 to 71%) with larger FLW applications. Increases in the amounts of surface soil inorganic and organic P with FLW application were due mainly to increases in labile fractions of these P forms. When FLW applications were stopped, however, soil organic P contents decreased to pretreatment levels more rapidly than inorganic P contents as a result of labile organic P mineralization. Increased P contents of surface soil following FLW applications will increase the potential for soluble and sediment‐bound P to be transported in runoff.