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This article in JEQ

  1. Vol. 35 No. 5, p. 1803-1811
     
    Received: Jan 2, 2006
    Published: Sept, 2006


    * Corresponding author(s): lars.bergstrom@mv.slu.se
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doi:10.2134/jeq2006.0003

Leaching and Crop Uptake of Nitrogen and Phosphorus from Pig Slurry as Affected by Different Application Rates

  1. Lars Bergström * and
  2. Holger Kirchmann
  1. Department of Soil Science, Swedish University of Agricultural Sciences, P.O. Box 7014, SE-75007 Uppsala, Sweden

Abstract

The influence of increasing pig slurry applications on leaching and crop uptake of N and P by cereals was evaluated in a 3-yr study of lysimeters filled with a sandy soil. The slurry was applied at N rates of 50 (S50), 100 (S100), 150 (S150), and 200 (S200) kg ha−1 during 2 of the 3 yr. The P rates applied with slurry were: 40 (S50), 80 (S100), 120 (S150), and 160 (S200) kg ha−1 yr−1 Simultaneously, NH4NO3 and Ca(H2PO4)2 were applied at rates of 100 kg N ha−1 and 50 kg P ha−1, respectively, to additional lysimeters (F100), while others were left unfertilized (F0). During the 3-yr period, the leaching load of total N tended to increase with increasing slurry application to, on average, 139 kg ha−1 at the highest application rate (S200). The corresponding N leaching loads (kg ha−1) in the other treatments were: 75 (F0), 103 (F100), 93 (S50), 120 (S100), and 128 (S150). The loads of slurry-derived N in the S100, S150, and S200 treatments were significantly larger (P < 0.05) than those of fertilizer-derived N. In contrast, P leaching tended to decrease with increasing input of slurry, and it was lower in all treatments that received P at or above 50 kg P ha−1 yr−1 with slurry or fertilizer than in the unfertilized treatment. The crop use efficiency of added N and P was clearly higher when NH4NO3 and Ca(H2PO4)2 were used rather than slurry (60 vs. 35% for N, 38 vs. 6–9% for P), irrespective of slurry application rate. Therefore, from both a production and water quality point of view, inorganic fertilizers seem to have environmental benefits over pig slurry when used on sandy soils.

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