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This article in JEQ

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



Forms of Phosphorus in Soil Receiving Cattle Feedlot Waste1

  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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