有机质、水解氮和速效钾的空间变异主要是由结构性因素引起的，速效磷的空间变异是由随机因素引起的。
The spatial variability of organic matter, available N, and available K was mainly caused by structural factors and that of available P was primarily caused by random factors.
摘要文中讨论了酮连氮水解制备肼的各种方法及催化剂对酮连氮水解和肼收率的影响。
The review discusses many ways of preparing hydrazine through hydrolysis of azine, and the effects of catalyst to yield of hydrazine by hydrolyzing azine.
摘要文中讨论了酮连氮水解制备肼的各种方法及催化剂对酮连氮水解和肼收率的影响。
Abstract the review discusses many ways of preparing hydrazine through hydrolysis of azine, and the effects of catalyst to yield of hydrazine by hydrolyzing azine.
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