Abstract
In a field experiment, the effect of animal slurry, (with and without the nitrification inhibitor dicyandiamide on total denitrification losses estimated by the C2H2 inhibition technique was measured over 2 years (1989–1990). During this period, four different plots (each with four replicates) were fertilized six times with 150 kg N ha-1 in the form of cattle-pig slurry or NH4NO3. Soil samples (0–20 cm) were analysed at regular intervals for NH sup+inf4 and NO sup−inf3 concentrations. The soil water content was determined gravimetrically. During the first year (1989) total denitrification losses from unfertilized, mineral-fertilized, and animal slurry-amended plots (with or without dicyandiamide) were estimated as 0.2, 3.1, 0.7, and 0.6 kg N ha-1, respectively. During the second year (1990) the denitrification losses were 0.4, 1.3, 0.7, and 0.7 kg N ha-1, respectively. There was a clear relationship between the NO sup−inf3 concentration or soil water content and the denitrification rate. The results are siteund experiment-specific and cannot be generalized so far.
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Schwarz, L., Kapp, M., Benckiser, G. et al. Evaluation of denitrification losses by the acetylene inhibition technique in a permanent ryegrass field (Lolium perenne L.) fertilized with animal slurry or ammonium nitrate. Biol Fert Soils 18, 327–333 (1994). https://doi.org/10.1007/BF00570636
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DOI: https://doi.org/10.1007/BF00570636