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Journal of Environmental Quality Abstract -

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


This article in JEQ

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

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  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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