基质肥料缓释基质的筛选及其氮素释放规律

为提高基质肥料的缓释性能，该文选用10种有机和无机基质制备基质肥料，通过砂柱间歇淋洗的方法研究了基质肥料的氮素释放规律，并根据Logistic方程的参数和氮素释放拐点的UPGMA聚类分析评价了10种基质的缓释效果，结果表明：基质肥料氮素累积释放率随时间的动态变化可用一级动力学方程、Elovich方程、抛物线扩散方程和Logistic方程表征，其中以Logistic方程拟合效果最好，这说明定量描述氮素养分释放规律的方程中以Logistic方程评价更具有实效性，而有机基质中氧化淀粉和木质素的缓释效果较好，无机基质中膨润土的缓释效果最好。

Screening of slow releasing substrate of matrix-based fertilizer and its nitrogen release mechanism

In order to improve the slow-release performance of Matrix-Based Fertilizer, ten kinds of Matrix-Based Fertilizer were made with organic and inorganic substrates. Their nitrogen releasing orders were studied by alternate leaching method in sandy pole, and the slow-release effects of ten substrates were evaluated through the parameters of Logistic equations and Unweighted Pair-Group Method Using Arithmetic Averages cluster analysis of nitrogen releasing inflection. The result showed that the dynamics of nitrogen accumulated releasing rate could be quantitatively described by four equations: the first-order Kinetics equation, Elovich equation, Parabola equation and Logistic equation. However, the imitation of Logistic equation was the best. That was to say the Logistic equation was the most practical for imitating nitrogen release mechanism of MBF. Oxidized starch and lignin were the best slow-release organic substrate and bentonite was the best inorganic one.