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Journal of Environmental Quality Abstract -

Forms of Phosphorus in Soil Receiving Cattle Feedlot Waste1


This article in JEQ

  1. Vol. 13 No. 2, p. 211-215
    Received: July 6, 1983

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  1. A. N. Sharpley,
  2. S. J. Smith,
  3. B. A. Stewart and
  4. A. C. Mathers2



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.

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