尿素添加硝化抑制剂DMPP对稻田土壤不同形态矿质态氮的影响

采用小粉土和青紫泥两种典型土壤种植水稻,研究尿素添加新型硝化抑制剂3,4-二甲基吡唑磷酸盐（DMPP）对土壤氮素转化及水稻生物学效应的影响。结果表明,水稻田施用含DMPP硝化抑制剂的尿素,与常规尿素处理相比,小粉土和青紫泥土壤中铵态氮浓度分别增加94.6%-97.9%和55.4%-65.1%,硝态氮浓度下降49.0%-81.3%和33.9%-83.7%,亚硝态氮浓度下降46.9%-90.9%和53.7%-90.2%。添加DMPP抑制剂于尿素,小粉土和青紫泥处理水稻的产量增加24.9%和14.2%,生物量增加20.6%和14.4%,吸氮量增加15.3%和22.5%。DMPP抑制剂可有效保持土壤高铵态氮浓度、低硝态氮与亚硝态氮浓度,促进水稻对氮素的吸收利用,提高氮素利用率。

Effect of the Urea with Nitrification Inhibitor DMPP Addition on Different Form Nitrogen Transformation in Rice Fields

In a rice pot incubation experiment, the effect of nitrogen transformation and rice growth were studied by applied urea with new nitrification inhibitor 3,4-dimethyl pyrazole phosphate（DMPP） in the powder soil and blue clayey paddy soil. The results showed that, in the powder soil and blue clayey paddy soil, the ammonium concentration were increased 94.6% to 97.9% and 55.4% to 65.1%, nitrate nitrogen concentrations were declined 49.0% to 81.3% and 33.9% to 83.7%, and nitrite nitrogen concentrations were declined 46.9% to 90.9% and 53.7% to 90.2%, respectively. DMPP could stimulate the nitrogen uptake, improve the rice yields 24.9% and 14.2%, increase biomass amount 20.6% and 14.4%, in the powder soil and blue clayey paddy soil, respectively. The nitrogen adsorption amount was also increased 15.3% and 22.5% in the powder soil and blue clayey paddy soil, improving the nitrogen use efficiency in rice production. The nitrification inhibitor DMPP addition in the urea could effectively sustain the high ammonium nitrogen concentration and low nitrate and nitrite nitrogen concentrations in the soil, increase the nitrogen uptake by rice and improve the nitrogen use efficiency.