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      Multiple small monthly doses of dicyandiamide (DCD) did not reduce denitrification in Waikato dairy pasture

      Watkins, Natalie Lisa; Schipper, Louis A.; Sparling, Graham P.; Thorrold, Bruce; Balks, Megan R.
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      Schipper 2013 multiple small.pdf
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      DOI
       10.1080/00288233.2012.736389
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      Watkins, N., Schipper, L., Sparling, G., Thorrold, B., & Balks, M. (2013). Multiple small monthly doses of dicyandiamide (DCD) did not reduce denitrification in Waikato dairy pasture. New Zealand Journal of Agricultural Research, 56(1), 37-48.
      Permanent Research Commons link: https://hdl.handle.net/10289/7436
      Abstract
      The effectiveness of multiple small doses of the nitrification inhibitor dicyandiamide (DCD) to decrease denitrification under warm moist conditions was tested in a 1-year field trial on a grazed dairy pasture. DCD was applied approximately every 4 weeks as an aqueous spray onto ten replicate plots 3 days after rotational grazing by dairy cows. Each application was at the rate of 3 kg DCD ha⁻¹, with a total annual application of 33 kg ha⁻¹. Denitrification was assessed 5 days after each DCD application using the acetylene block method. At the end of the trial, the rate of degradation of DCD under summer conditions was measured. DCD significantly decreased the mean annual nitrate concentration by about 17%. Denitrification and denitrification enzyme activity were highly variable and no significant effect of DCD in decreasing denitrification was detected. In the summer month of December, DCD degraded rapidly with an estimated half-life of 5 ± 3 days (mean and standard deviation).
      Date
      2013
      Type
      Journal Article
      Publisher
      Royal Society of New Zealand
      Rights
      © 2013, Royal Society of New Zealand. Used with permission.
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      • Science and Engineering Papers [3122]
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