The"311-A"regression design was adopted to study the optimum ratio of N, P and K fertilizers on maize field of Yellow River Pumping Irrigation District in Cheng Xitan, Yanchi Ningxia.
运用“311-A”试验设计，探讨宁夏盐池县城西滩扬黄灌区玉米氮、磷、钾肥料的最佳配比。
Irrigation district operation requires that pumping station not only satisfy normal water supply, but ensure the water reserves of adjustment reservoir and water lifting irrigation form the reservoir.
灌区运行要求泵站既能满足正常情况供水，又能满足向调节水库储水和从调节水库提水灌溉。
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