[Inhibitory effect of pyrazole compound DL-1 on soil nitrification: a preliminary study].

The study with soil incubation test under constant temperature and humidity showed that compared with DCD,DL-1 could significantly inhibit the oxidation of soil ammonium.In the first 3 weeks of incubation,DL-1 had an inhibitory effect of 70% on soil nitrification,with the best effect during 14～28 d of incubation.On the 14,21,and 28 d of incubation,DL-1with its dosage being 1.0 % of (NH_4)_2SO_4-N decreased the soil NO_3--N content by 26.23%,33.27% and 23.31%,respectively,compared with the same dosage of DCD,and by 71.12%,69.10% and 55.14%,respectively,compared with no inhibitors applied.When the dosage of DL-1 accounted for 2.0% of applied N,soil nitrification was strongly inhibited,and soil NO_3--N content remained at a lower level till to the end (90 d) of incubation.