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This article in SSSAJ

  1. Vol. 67 No. 2, p. 645-653
     
    Received: Mar 11, 2002
    Published: Mar, 2003


    * Corresponding author(s): tgriffin@maine.edu
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doi:10.2136/sssaj2003.6450

Changes in Soil Phosphorus from Manure Application

  1. T. S. Griffin *,
  2. C. W. Honeycutt and
  3. Z. He
  1. USDA-ARS, New England Plant Soil and Water Laboratory, University of Maine, Orono, ME 04469-5753

Abstract

Manure and mineral fertilizer P sources vary in their contributions to soil P pools. We conducted incubation experiments to (i) assess temporal changes in soil P concentration for 84 d following application of KH2PO4 or manure (beef, dairy, poultry, or swine), and (ii) to evaluate interactive effects of P rate, P source, and background P level on soil P pools 90 d after P application. Changes in soil P over time were evaluated following the amendment of a coarse-loamy, mixed, frigid Typic Haplorthod soil (pH 5.8) at a rate of 100 mg total P kg−1 Water soluble P (WSP), 0.01 M CaCl2–extractable P (CaCl2–P), and modified Morgan P (MMP) declined to <3 mg P kg−1 soil within 21 d of application, following an exponential decay function; P extracted by anion-exchange membrane (AEMP) and Mehlich-III (M3-P) also declined rapidly and are attributed to the high level of exchangeable Al and Fe in this soil. Ninety days after application, all soil P pools exhibited linear increases in concentration for application rates up to 800 mg P kg−1 soil, regardless of P source. Phosphorus applied as KH2PO4 was more efficient at increasing CaCl2–P and M-3P. Manure P sources generally had a greater effect on MMP, and poultry manure was more efficient than all other sources. Efficiency of P sources at increasing soil P concentration (b, slope of linear regression) varied from <1% for rapidly available P pools (CaCl2–P) to nearly 50% for more recalcitrant P (M3-P). Efficiency also increased as background M3-P increased from 150 to 750 mg kg−1 soil. The amount of CaCl2–extractable P increased rapidly when soil P saturation ([Mehlich III-P]/[Mehlich-III Al + Fe]) exceeded 0.25 mol mol−1 Manure and KH2PO4 contribute to different soil P pools, and these differences are magnified at high application rates and high background soil P levels.

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Copyright © 2003. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.67:645–653.