水肥调控对设施土壤硝态氮含量动态的影响

本研究根据连续二年设施水肥调控试验,以番茄为试验材料,采用2因子（灌水和氮肥用量）3水平的设计开展水肥调控效应对土壤硝态氮含量及剖面动态变化的研究,分析其对水肥调控效应的响应,主要研究成果如下：（1）土壤硝态氮含量与施氮量成正比关系,土壤水分含量、硝态氮含量的剖面动态变化与灌水下限、施氮量密切相关。（2）施氮量对硝态氮含量的影响大于灌水下限,而灌水下限对土壤水分含量的影响大于施氮量。

Effects of water and fertilizer regulation on nitrate nitrogen content in Greenhouse Soil

On the basis of two years of continuous facilities of water and fertilizer regulation test using tomato as experimental material, using 2 factors (nitrogen fertilizer and irrigation) study on the changes of nitrogen content and soil nitrate profiles to carry out dynamic coupling effect of water and nitrogen completely designed 3 levels, analysis its response to water and nitrogen coupling effect, the main research results are as follows: (1) Effects of water and fertilizer regulation on the dynamics of nitrate nitrogen content in greenhouse soil soil nitrate nitrogen content is in direct proportion to the amount of nitrogen applied, and the profile dynamic changes of soil water content and nitrate nitrogen content are closely related to the lower limit of irrigation and the amount of nitrogen applied.(2) effect of nitrogen fertilizer on nitrate content is greater than the effect of irrigation and irrigation limit, lower limit of the soil moisture content is greater than the amount of nitrogen.