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盆栽试验表明,在低磷土壤上施用钾肥无增产效果。土壤磷素水平是限制花生施钾效果的主导因素,施钾花生荚果增产率与土壤有效磷水平和土壤有效钾、磷比值呈正相关。只有当磷素供应充足时,土壤的有效钾水平才是限制花生施钾效果的主导因素,施钾花生荚果增产率与土壤有效钾水平呈负相关。因此,不能直接用土壤有效钾的绝对含量判断花生土壤钾素的丰缺,土壤有效钾、磷比值是花生钾肥施用的重要参数。
Pot experiments showed that the application of potash on low-phosphorus soils did not increase yield. Soil phosphorus was the dominant factor limiting the potassium application in peanut. The yield increase of peanut pod was positively correlated with soil available phosphorus and soil available potassium and phosphorus. Only when sufficient phosphorus supply was available, the available potassium level of soil was the dominant factor that limited the effect of potassium application in peanut. The yield increase of peanut pod applied with potassium was negatively correlated with the available potassium level in soil. Therefore, it is impossible to directly judge the abundance and deficiency of soil potassium in peanut soil by the absolute content of soil available potassium. The ratio of soil available potassium and phosphorus is an important parameter for the application of peanut fertilizer.