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This article in JEQ

  1. Vol. 35 No. 3, p. 928-937
     
    Received: Oct 26, 2005
    Published: May, 2006


    * Corresponding author(s): larney@agr.gc.ca
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doi:10.2134/jeq2005.0409

Predicting Phosphorus Availability from Soil-Applied Composted and Non-Composted Cattle Feedlot Manure

  1. Francis Zvomuyaa,
  2. Bobbi L. Helgasonb,
  3. Francis J. Larney *a,
  4. H. Henry Janzena,
  5. Olalekan O. Akinremic and
  6. Barry M. Olsond
  1. a Agriculture and Agri-Food Canada, Lethbridge Research Centre, 5403 1st Avenue South, Lethbridge, AB, Canada T1J 4B1
    b Land Resource Unit, Agriculture and Agri-Food Canada, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
    c Department of Soil Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
    d Alberta Agriculture, Food and Rural Development, 5401 1st Avenue South, Lethbridge, AB, Canada T1J 4V6

Abstract

Prediction of phosphorus (P) availability from soil-applied composts and manure is important for agronomic and environmental reasons. This study utilized chemical properties of eight composted and two non-composted beef cattle (Bos taurus) manures to predict cumulative phosphorus uptake (CPU) during a 363-d controlled environment chamber bioassay. Ten growth cycles of canola (Brassica napus L.) were raised in pots containing 2 kg of a Dark Brown Chernozemic clay loam soil (fine-loamy, mixed, Typic Haploboroll) mixed with 0.04 kg of the amendments. Inorganic P fertilizer (KH2PO4) and an unamended control were included for comparison. All treatments received a nutrient solution containing an adequate supply of all essential nutrients, except P, which was supplied by the amendments. Cumulative P uptake was similar for composted (74 mg kg−1 soil) and non-composted manures (60 mg kg−1 soil) and for the latter and the fertilizer (40 mg kg−1 soil). However, the CPU was significantly higher for organic amendments than the control (24 mg kg−1 soil) and for composted manure than the fertilizer. Apparent phosphorus recovery (APR) from composted manure (24%) was significantly lower than that from non-composted manure (33%), but there was no significant difference in APR between the organic amendments and the fertilizer (27%). Partial least squares (PLS) regression indicated that only two parameters [total water-extractable phosphorus (TPH2O) and total phosphorus (TP) concentration of amendments] were adequate to model amendment-derived cumulative phosphorus uptake (ACPU), explaining 81% of the variation in ACPU. These results suggest that P availability from soil-applied composted and non-composted manures can be adequately predicted from a few simple amendment chemical measurements. Accurate prediction of P availability and plant P recovery may help tailor manure and compost applications to plant needs and minimize the buildup of bioavailable P, which can contribute to eutrophication of sensitive aquatic systems.

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Copyright © 2006. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyASA, CSSA, SSSA