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This article in JEQ

  1. Vol. 7 No. 1, p. 50-54
    Received: May 9, 1977

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Effects of Soil, Cover Crop, and Nutrient Source on Amounts and Forms of Phosphorus Movement Under Simulated Rainfall Conditions1

  1. G. Y. Reddy,
  2. E. O. Mc Lean,
  3. G. D. Hoyt and
  4. T. J. Logan2



Three soils (Toledo silty clay, Rossmoyne silt loam, and Wauseon sandy loam) in greenhouse microplots were treated with chemical, chemical + straw, and manure sources of N, P, and K, cropped or left bare, and subjected to simulated rainfall. Phosphorus moving in runoff sediments, runoff solution, and leachate was measured. Most P moved as a component of sediments. Cropping decreased sediment and solution losses while manure generally increased losses in both. Most P moving in runoff solution was inorganic. However, except where percolation swept inorganic P downward without reaction with the soil, most P moving in leachate was organic. Fractionations of soil P revealed that P treatments increased the HN4Cl- and NH4F-extractable fractions markedly, had less effect on the NaOH-extractable fraction, and had still less effect on the H2SO4-extractable and organic fractions. All phosphorus sources markedly increased the equilibrium P concentrations (EPC) of all soils. Manure increased EPC more than the other sources in the Rossmoyne and Wauseon soils. The tendency for more sediment P to be lost from manure and for manure-treated soil to mobilize P into solution makes erosion control especially important, if much manure is to be applied to soils, and if eutrophication of surface waters is to be minimized.

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