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Advisor(s)
Abstract(s)
Nitrogen (N) losses through nitrate leaching, occurring after slurry
spreading, can be reduced by the use of nitrification inhibitors (NIs) such as
dicyandiamide (DCD) and 3,4-dimethyl pyrazole phosphate (DMPP). In the
present work, the effects of DCD and DMPP, applied at two rates with cattle
slurry, on soil mineral N profiles, annual ryegrass yield, and N uptake were
compared under similar pedoclimatic conditions. Both NIs delayed the nitrate
formation in soil; however, DMPP ensured that the soil mineral N was
predominantly in the ammonium form rather than in the nitrate form for about
100 days, whereas with DCD such effect was observed only during the first 40
days after sowing. Furthermore, the use of NIs led to an increase of the drymatter
(DM) yields in a range of 32–54% and of the forage N removal in a range
of 34–68% relative to the slurry-only (SO) treatment (without NIs). A DM yield
of 8698 kg ha21 was obtained with the DMPP applied at the greater rate against
only 7444 kg ha21 obtained with the greater rate of DCD (4767 kg ha21 in the SO
treatment). Therefore, it can be concluded that DMPP is more efficient as an NI
than DCD when combined with cattle slurry
Description
Keywords
cattle slurry dicyandiamide (DCD) 3,4-dimethyl pyrazole phosphate (DMPP) forage yield nitrification inhibitor soil mineral nitrogen
Pedagogical Context
Citation
D. Fangueiro , A. Fernandes , J. Coutinho , N. Moreira & H. Trindade (2009) Influence of Two Nitrification Inhibitors (DCD and DMPP) on Annual Ryegrass Yield and Soil Mineral N Dynamics after Incorporation with Cattle Slurry, Communications in Soil Science and Plant Analysis, 40:21-22, 3387-3398
Publisher
Taylor & Francis