水稻土与旱地土壤不同,耕层中存在着特殊的氧化还原过程,从而引起氮素肥料还原成气体并逸失到空气中,这是氮素肥料利用率较低的原因之一,也是早已被肯定的事实。近年来,随着我国氮素化肥用量的增大,在生产实践中氮肥利用率的低下,农民群众也有明确的反映。为此,硝化抑制剂的研究和应用也逐渐地被重视起来。但对土壤条件与脱氮强度的关系,特别是通过农业技术措施(烤田、耘耥)来改变水稻土的氧化还原状况,以影响脱氮过程等方面的研究还比较少。本项工作着重在这方面作一点研究,为设法防止或减少水稻土脱氮现象及合理使用硝化抑制剂提供一些参考依据。 Paddy soil is different from upland soil, and there is a special redox process in the topsoil, which causes nitrogen fertilizer to reduce to gas and escape into the air, which is one of the reasons why nitrogen fertilizer utilization rate is low and has long been confirmed fact. In recent years, with the increase of the amount of nitrogenous fertilizer in our country, the nitrogen utilization rate is low in the production practice, and the peasants also have a clear reflection. To this end, nitrification inhibitor research and application are gradually being taken seriously. However, the relationship between soil conditions and denitrification intensity, especially through agricultural technology measures (baked fields, Yun 耥) to change the redox conditions of paddy so as to affect the nitrogen removal process and other aspects of the research is still relatively small. This work focuses on a little research in this area and provides some references for trying to prevent or reduce denitrification of paddy soil and rational use of nitrification inhibitors.