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    The effect of precipitation and application rate on dicyandiamide persistence and efficiency in two Irish grassland soils

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    Author
    Cahalan, E.
    Minet, E.
    Emfors, M.
    Muller, Christoph
    Devaney, D.
    Forrestal, Patrick J.
    Richards, Karl G.
    Keyword
    Nitrification inhibitor
    Nitrate
    Dicyandiamide
    nitrogen use efficiency
    leaching
    grassland soils
    Date
    14/07/2015
    
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    URI
    http://hdl.handle.net/11019/948
    Citation
    Cahalan, E., Minet, E., Ernfors, M., Müller, C., Devaney, D., Forrestal, P. J. and Richards, K. G. (2015), The effect of precipitation and application rate on dicyandiamide persistence and efficiency in two Irish grassland soils. Soil Use and Management, 31: 367–374. doi: 10.1111/sum.12194
    Abstract
    The nitrification inhibitor dicyandiamide (DCD) has had variable success in reducing nitrate (NO3-) leaching and nitrous oxide (N2O) emissions from soils receiving nitrogen (N) fertilisers. Factors such as soil type, temperature and moisture have been linked to the variable efficacy of DCD. Since DCD is water soluble it can be leached from the rooting zone where it is intended to inhibit nitrification. Intact soil columns (15 cm diameter by 35 cm long) were taken from luvic gleysol and haplic cambisol grassland sites and placed in growth chambers. DCD was applied at 15 or 30 kg DCD ha-1, with high or low precipitation. Leaching of DCD, mineral N and the residual soil DCD concentrations were determined over eight weeks High precipitation increased DCD in leachate and decreased recovery in soil. A soil x DCD rate interaction was detected for the DCD unaccounted (proxy for degraded DCD). In the cambisol degradation of DCD was high (circa 81%) and unaffected by DCD rate. In contrast DCD degradation in the gleysol was lower and differentially affected by rate, 67 and 46% for the 15 and 30 kg ha-1 treatments, respectively. Differences DCD degradation rates between soils may be related to differences in organic matter content and associated microbiological activity. Variable degradation rates of DCD in soil, unrelated to temperature or moisture, may contribute to varying DCD efficacy. Soil properties should be considered when tailoring DCD strategies for improving nitrogen use efficiency and crop yields, through the reduction of reactive nitrogen loss.
    Funder
    Department of Agriculture, Food and the Marine, Ireland
    Grant Number
    RSF 07519; RSF 07545
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1111/sum.12194
    Scopus Count
    Collections
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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