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This article in SSSAJ

  1. Vol. 67 No. 2, p. 544-554
     
    Received: Nov 6, 2001
    Published: Mar, 2003


    * Corresponding author(s): laboski@msu.edu
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doi:10.2136/sssaj2003.5440

Changes in Soil Test Phosphorus Concentration After Application of Manure or Fertilizer

  1. Carrie A. M. Laboski *a and
  2. John A. Lambb
  1. a Dep. of Crop and Soil Sciences, Michigan State University, 286 Plant and Soil Sciences, East Lansing, MI 48824
    b Dep. of Soil, Water, and Climate, University of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108

Abstract

The availability of P from injected manure application has received limited study. The objectives of this study were to determine the effect of time on P availability in soils amended with manure or fertilizer, evaluate the relative availability of manure P compared with fertilizer P, and determine the impact of previous manure history on P availability. Liquid swine manure or fertilizer was applied to Minnesota soils, from seven different mapping units with various manure histories. The application rates were equivalent to the amount of total P applied in undisturbed manure injection zones. Soils were analyzed for available P after incubation periods of 1, 2, 3, 6, and 9 mo. As the duration of incubation increased, fertilizer P became less available in six of the seven soil series, while soil test P concentrations in manured soils were unchanged. Phosphorus from liquid swine manure was more available than fertilizer P from 1 through 9 mo of incubation. It is postulated that the decomposition of manure resulted in concentrations of organic acids that effectively reduced P sorption to the soil and increased P availability. Prior manure history had a mixed impact on the availability of P from subsequent applications of manure or fertilizer. Further studies need to be conducted to determine if similar results can be found in a field setting.

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Copyright © 2003. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.67:544–554.