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This article in JEQ

  1. Vol. 38 No. 4, p. 1700-1708
     
    Received: May 21, 2008


    * Corresponding author(s): u.pillaimcgarry@uq.edu.au
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doi:10.2134/jeq2008.0236

Phytase Supplemented Poultry Diets Affect Soluble Phosphorus and Nitrogen in Manure and Manure-amended Soil

  1. Usha P. P. Pillai *a,
  2. Veeragathipillai Manoharanb,
  3. Allan Lislec,
  4. Xiuhua Lid and
  5. Wayne Brydend
  1. a Centre for Mined Land Rehabilitation, The Univ. of Queensland, St. Lucia, Qld. 4072, Australia
    b Department of Environmental Science, Univ. of Technology Sydney, Broadway, NSW 2007, Australia
    c School of Land, Crop and Food Sciences, The Univ. of Queensland, Gatton Qld. 4343, Australia
    d School of Animal Studies, The Univ. of Queensland, Gatton Qld.4343, Australia

Abstract

Understanding P and N dynamics in manure-amended soil is essential for estimating the environmental impact of manure utilization in land applications. A laboratory incubation study was conducted to assess, (i) the effect of feeding a standard Australian commercial diet, and diets modified with phytase supplementation and reduced nonphytase phosphorus (NPP), on the concentrations of P and N (total and soluble) in the manure derived from layer hens (Gallus domesticus L.), and (ii) the change in water-soluble phoshorus (PWSP) and mineral N (NH4–N and NO3–N) when used as a soil amendment, applied at rates equivalent to 200 kg ha−1 (200N) and 400 kg ha−1 (400N). Phytase supplementation increased %PWSP by 8 to 12% in the manures, regardless of the levels of NPP in the diets, and in the manure-amended soils by 27 to 30% at the 200N application rate, and up to 54% at the 400N rate. Phytase significantly (P < 0.05) reduced total nitrogen (TN) content (by 12–31%) of the manures but generally produced greater nitrate accumulation in the manure-amended soils. Net nitrification, which commenced 4 wk after incubation, was accompanied by a simultaneous decrease in soil pH (by one pH unit) and a concomitant decline in %PWSP The decline in %PWSP was primarily attributed to P retention by the soil as it became more acidic. This study suggests that phytase addition not only reduces manure total N content, and increases water-soluble P, but its effects on manure total phosphorus (TP) and 2 mol L−1 KCl extractable mineral N is influenced by the NPP level in the diet.

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