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本文研究油菜缺钾症的发生与油菜叶片钾、氮含量及土壤交换钾、缓效钾、水解氮的关系.结果指出油菜花期叶片全钾(K)量<1.30％时,籽粒产量和叶片全钾呈显著正相关。缺钾症状的发生不仅与叶片含钾量有关,且与叶片含氮量有关,钾低氮高,K/N比<0.25时,一般都发生缺钾症、从土壤方面看,缺钾症既与交换！钾有关,也和缓效钾有关,如交换钾<50ppm,而缓效钾土30mg/100g土(即≥300ppm)时,叶片含钾量主要取决于缓效钾。因此认为植株诊断以叶片K/N比、土壤诊断以交换钾和缓效钾双值作指标为宜。
In this paper, we studied the relationship between the occurrence of potassium deficiency in rapeseed (Brassica napus L.) and the content of potassium and nitrogen in rape leaves, exchangeable potassium, slow-acting potassium and hydrolyzed nitrogen.The results showed that when the total potassium (K) was less than 1.30% Potassium was significantly positive correlation. The occurrence of potassium deficiency is not only related to leaf potassium content, but also relates to leaf nitrogen content. Potassium low nitrogen, K / N ratio <0.25, the general occurrence of potassium deficiency, from the soil point of view, potassium deficiency both Exchange with! Potassium is also associated with slow potassium, such as exchange potassium <50ppm, while slow potassium 30mg / 100g soil (ie, ≥ 300ppm), the leaf potassium content depends mainly on slow potassium. So that the plant diagnosis of leaf K / N ratio, soil diagnostic exchange potassium and slow potassium double as an indicator is appropriate.