This paper study on the effects of PAM on improving water stable aggregate and reducing nutrients loss from sandy soil, methods of Laboratory incubation and leaching were adopted.
采用在实验室培养和用淋洗管模拟田间淋洗的方法研究聚丙烯酰胺对沙土水稳性团粒结构改良作用，对氮、磷、钾养分保肥的作用以及其合理施用量。
Results show that simple composition and stable properties of W oxide is a prerequisite for quality WC powder with uniform particle size and less aggregate.
结果表明：保证原料氧化钨相成分单一和性能稳定是生产粒度均匀、聚团少的优质WC粉的前提；
Aggregate stability comes from a stable central tendency.
总体稳定是来自一系列的中间趋势。
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