The effect of nitrification inhibitors in reducing nitrification and the ammonia oxidizer population in three contrasting soils

Abstract

Purpose: 3,4-Dimethylpyrazole phosphate (DMPP) and acetylene (C2H2) are widely used nitrification inhibitors. These nitrification inhibitors have shown inconsistent efficacy in different soils, demonstrating the importance of determining which soil and microbial factors cause this variability. The aim of the present study was to investigate the efficacy of DMPP and C2H2 to inhibit nitrification and the ammonia oxidizer population in three contrasting soil types from Australia. Materials and methods: Three contrasting soils of different pHWater (4.6, 7.0, and 8.0) collected from different agriculture systems in Australia were used in a laboratory incubation experiment for 28 days to compare t..