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Journal of Environmental Quality Abstract - Special Submissions: Novel Manure Management Techniques in No-Till and Forage Systems

Nitrogen Fertilizer Replacement Value of Cattle Slurry in Grassland as Affected by Method and Timing of Application

 

This article in JEQ

  1. Vol. 40 No. 2, p. 362-373
     
    Received: Jan 29, 2010


    * Corresponding author(s): Stan.Lalor@teagasc.ie
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doi:10.2134/jeq2010.0038
  1. S. T. J. Lalor *a,
  2. J. J. Schröderb,
  3. E. A. Lantingac,
  4. O. Oenemac,
  5. L. Kirwand and
  6. R. P. O. Schultea
  1. a Teagasc, Johnstown Castle, Wexford, Republic of Ireland
    b Plant Research International, Wageningen, The Netherlands
    c Wageningen Univ., The Netherlands
    d Waterford Institute of Technology, Waterford, Republic of Ireland. Assigned to Associate Editor Doug Beegle

Abstract

Slurry application with methods such as trailing shoe (TS) results in reduced emissions of ammonia (NH3) compared with broadcast application using splashplate (SP). Timing the application during cool and wet weather conditions also contributes to low NH3 emissions. From this perspective, we investigated whether reduced NH3 emissions due to improved slurry application method and timing results in an increase in the nitrogen (N) fertilizer replacement value (NFRV). The effects of application timing (June vs. April) and application method (TS vs. SP) on the apparent N recovery (ANR) and NFRV from cattle slurry applied to grassland were examined on three sites over 3 yr in randomized block experiments. The NFRV was calculated using two methods: (i) NFRVN based on the ANR of slurry N relative to mineral N fertilizer; and (ii) NFRVDM based on DM yield. The TS method increased the ANR, NFRVN, and NFRVDM compared with SP in the 40- to 50-d period following slurry application by 0.09, 0.10, and 0.10 kg kg−1, respectively. These values were reduced to 0.07, 0.06, and 0.05 kg kg−1, respectively, when residual harvests during the rest of the year were included. The highest NFRVDM for the first harvest period was with application in April using TS (0.30 kg kg−1), while application in June with SP had the lowest (0.12 kg kg−1). The highest NFRVDM for the cumulative harvest period was with application in April using TS (0.38 kg kg−1), while application in June with SP had the lowest (0.17 kg kg−1). Improved management of application method, by using TS instead of SP, and timing, by applying slurry in April rather than June, offer potential to increase the NFRVDM of cattle slurry applied to grassland.

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