The Effects of 3,5-Dimethylpyrazole on Soil Nitrification and Related Enzyme Activities in Brown Soil

Heterocyclic nitrogen compounds containing two adjacent atoms generally have a significant effect on soil nitrification inhibition, and 3,5-dimethylpyrazole (DMP) is typical representative of this structure. However, the inhibitory regulatory mechanism DMP N transformation are unclear. In study, microcosm with different concentrations was carried out in brown to detect dynamic changes NH4+–N, NO3–N related enzyme activities. Results showed that inhibited effectively decreased nitrate reductase activity, while increasing nitrite dehydrogenase The inhibition effects were dose dependent, at rate 0.025 g kg−1 dry strongest soil. activity increased an application rate. soil’s chemical biological properties caused by provided new idea for systematically explaining how participated process. This study further implied would play positive roles alleviating environmental pressure delaying nitrate-N formation decreasing reductase.