灌水定额对玉米膜孔灌氮素转化影响试验

Experiment research on irrigation quota effect on nitrogen transformation under film hole irrigation for corn

为揭示灌水定额对膜孔灌玉米农田土壤氮素运移转化特性,通过非线性回归法对不同灌水定额玉米膜孔灌施肥试验资料进行分析,研究提出了膜孔灌玉米农田土壤硝态氮及其转化量和转化率、土壤铵态氮及其转化量和转化率与灌水定额和运移转化时间的经验公式.分析检验表明:经验公式的相关系数均大于0.9100,标准误差很小,且通过0.05的显著性检验,该经验公式可以反映膜孔灌条件下不同灌水定额的土壤氮素运移转化特性,该研究为提高膜孔灌氮素利用效率奠定了科学基础.

In order to reveal the influence of irrigation quota on the nitrogen transportation and transformation under film hole irrigation for corn, through analyzing the experimental data by the nonlinear regression method on irrigation quota under film hole irrigation for corn, empirical formulas that indicated the relationship among the change and rate of soil moisture, the transform quantity and rate of NO3^- -N and NH4^＋ -N, and irrigation quota and the transformation time are put forward. The analysis and test show that the empirical formulas＇ relation coefficients are all bigger than 0. 9100; standard errors are very small; and passing the 0.05 testing significance, the formulas can reflect the law for the nitrogen transfer and trans-formation under film hole irrigation. The research results have laid a scientific foundation for improving the utilization efficiency of nitrogen under film hole irrigation.