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Journal of Environmental Quality Abstract -

Phosphorus Adsorption-Desorption Characteristics of Two Soils Utilized for Disposal of Animal Wastes1

 

This article in JEQ

  1. Vol. 9 No. 1, p. 86-92
     
    Received: Oct 16, 1978


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doi:10.2134/jeq1980.00472425000900010020x
  1. K. R. Reddy,
  2. M. R. Overcash,
  3. R. Khaleel and
  4. P. W. Westerman2

Abstract

Abstract

The purpose of this study was to determine the effect of animal waste loading rates on P adsorption-desorption characteristics of two soils. In a laboratory incubation study, Norfolk soil was treated with beef, poultry, or swine wastes; and allowed to decompose under optimum moisture conditions for a period of 30 days. Phosphorus adsorption-desorption characteristics of the soil were measured at the end of the incubation period. Application of beef, poultry, and swine wastes to a Norfolk soil decreased adsorption capacity of the soil and increased soluble P (in 0.01M CaCl2), acid-extractable P (0.05N HCl + 0.025N H2SO4), equilibrium P concentration (EPC), and P desorption (after four 1-hour extractions).

In a field study, increased rates of swine lagoon effluent application over a period of 5 years to a Norfolk soil (Site 1) and for 3 years to a Cecil soil (Site 2) also increased soluble P (in 0.01M CaCl2), acid extractable P, P desorbed, and EPC values, and decreased the adsorption capacity. At high loading rates of swine lagoon effluent, soluble P movement occurred to a depth of 75 and 30 cm at Site 1 and 2, respectively. Phosphorus adsorption increased with depth, and EPC values decreased with increasing depths of soil profile. A significant relationship was observed between EPC values, and soluble and acid extractable P.

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