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Forms of Phosphorus in Soil Receiving Cattle Feedlot Waste¹

ABSTRACT

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.

Key Words: available P • inorganic P • organic P • total P • manure

¹ Contribution from Oklahoma Agric. Exp. Stn., Oklahoma State Univ., USDA-ARS, Durant, Okla., and USDA-ARS, Bushland, Tex. Published with approval of the Exp. Stn. Director as paper no. 4346 of the Journal Series.

² Soil Scientists, USDA-ARS, Durant, Okla. and Bushland, Tex. The senior author is under a cooperative agreement with USDA-ARS, Durant, and Oklahoma State Univ., Agreement no. 58-7B30-8-22, USDA-ARS, P.O. Box 1430, Durant, OK 74702.

Received for publication July 6, 1983.

This article has been cited by other articles:

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