The new nitrification inhibitor DMPP — effects on gaseous emissions (N2O, CO2, CH4) from soil under field conditions

Abstract

From an ecological viewpoint using a nitrification inhibitor (NI) with ammonium based fertilizers may be one potential management strategy to lower the fluxes of trace gases thus mitigating their undesirable effects. During 3 years of repeated application in the field, the effects of the new NI s DMPP (3,4-dimethylpyrazole phosphate) and C1MP (4-chloro-3-methylpyrazole) on net fluxes of N 2 O, CH 4 and CO 2 from soil were investigated in comparison to DCD (dicyandiamide). Compared to the control plots without NI, the average N 2 O emissions of DMPP, C1MP and DCD treated plots were 49, 26 and 25 % lower. Furthermore, DMPP apparently stimulated CH 4 oxidation throughout the 3 growing seasons by 28 % in comparison to control. Surprisingly, our data suggest that all 3 NIs affect C-mineralisation as quantified by CO 2 emissions. The NI s decreased the release of CO 2on average of the 3 years by 7 % (DCD), 6 % (C1MP) and by 28 % (DMPP). Altogether, DCD and CIMP reduced the global warming potential (GWP) by 7 % and DMPP by 30 %, respectively. Results are site and experiment specific.