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田间试验结果表明，增施钾肥能促进大白菜对氮的吸收，提高其主要生育期地上部的氮营养水平；同时还能促进氮营养向叶球的转运和分配。试验还发现，在施钾（K2O）水平较高时（180，240kg/ha），硫酸钾处理地上部的总吸N量明显高于氯化钾处理，增产作用也更显著。因此，生产上以施用硫酸钾更为适宜。
The results of field experiments showed that increasing potassium fertilizer can promote the absorption of nitrogen in Chinese cabbage and increase the nitrogen nutrition of above-ground part of its main growth period. At the same time, it can also promote the transport and distribution of nitrogen fertilizer to leaf spheres. The experiment also found that when the level of K2O was high (180,240 kg / ha), the total N uptake of aboveground part of potassium sulfate treatment was obviously higher than that of potassium chloride treatment, and the stimulation effect was more significant. Therefore, the production of potassium sulfate is more appropriate.