灌水定额对玉米膜孔灌土壤水氮运移转化试验研究

Experiment Research on Irrigation Quota Soil Water Nitrogen Transformation Under Film Hole Irrigation for Corn

为研究不同灌水定额条件下玉米膜孔灌土壤水分和氮素的运移转化特性,通过灌水定额分别为300,450,600,750m3/hm2的玉米膜孔灌施氮肥试验,提出了不同灌水定额条件下玉米膜孔灌农田土壤含水率、土壤硝态氮和铵态氮含量随玉米生育时间的变化规律及其经验公式。结果表明:生育时间相同,土壤含水率随灌水定额增大而增大,土壤铵态氮含量随灌水定额增大而减小,土壤硝态氮含量随灌水定额增大而减小;灌水定额相同,土壤含水率随生育期的变化规律呈正余弦函数,土壤铵态氮含量随生育期的变化规律表现为先增大后减小,然后又增大,最后减小,土壤硝态氮含量随生育期的变化规律表现为先增大后减小,然后又增大,最后减小;不同灌水定额条件下玉米膜孔灌农田土壤含水率、土壤硝态氮和土壤铵态氮含量与玉米生育期之间的经验公式的相关系数均大于0.930 0,标准误差均很小。

To study the film hole irrigation soil moisture and migration transformation characteristic of nitrogen,through irrigation quota were 300,450,600,750m3/hm2 film hole irrigation of corn nitrogen test,the authors put forward the different irrigation quota under the conditions of film hole irrigation farmland soil moisture content of corn and soil nitrate nitrogen and ammonium nitrogen with the changing rule of the maize growth time and experience formula.The results show that the same time,soil moisture content increases with the irrigation quota,while soil ammonium nitrogen content decreases with increasing irrigation quota,soil nitrate content decreases with increasing irrigation quota.The same irrigation quota,the variation regularity of soil moisture content with time was positively cosine function,soil ammonium nitrogen content changes with the birth time first increases and then decreases,and increases then decreases,soil nitrate content changes with the birth time first increases and then decreases,and increases then decreases.Under the condition of different irrigation quota corn film hole irrigation farmland soil moisture content and soil nitrate nitrogen and ammonium nitrogen with the experience formula of the maize growth period of correlation coefficient are greater than 0.930 0,the standard error is very small.