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试验研究结果表明：在低钾土壤上，油菜植株出现缺钾症状，施用钾肥能促进植株的生长发育，显著提高油菜籽产量。钾肥的施用可提高油菜茎杆中钾的含量，籽粒中氮磷含量，但降低了籽粒ＮＰＫ数量占总ＮＰＫ吸收量的比例。同时，钾肥还可以提高油菜对氮肥的利用率。
The experimental results show that: In low-potassium soil, rapeseed plants appear potassium deficiency symptoms, the application of potassium fertilizer can promote plant growth and development, significantly improve rapeseed yield. Potassium application increased potassium content in stover of rapeseed and nitrogen and phosphorus content in kernel, but decreased the proportion of kernel NPK to total NPK uptake. At the same time, potash fertilizer can also increase the utilization of nitrogen fertilizer on rapeseed.