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在豫北潮土中上等肥力区，对几种主要农作物进行钾肥不同施用量肥效试验，发现在该区增施钾肥有较好的增产作用；并对目前生产水平条件下的最佳钾肥施用量和增产效果作了分析，为科学施肥提供了理论依据。
In the upper fertility area of Chao soil in the north of China, the experiment of fertilizer application efficiency of different K application rates to several main crops showed that the increase of K fertilizer was better in this area. And the best K application rate under current production level Dosage and effect of increased yield have been analyzed, providing a theoretical basis for scientific fertilization.