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红薯是喜钾作物,在肥料的氮、磷、钾三要素中,以钾的需要量为最大,氮次之,磷最少。一般红薯块根中氮、磷、钾含量比例为2:1:3。因此如果红薯在生长早期钾素缺乏,会出现节间,叶柄变短,叶片变小;后期缺钾老叶叶脉间严重缺绿,并逐渐坏死脱落,对产量影响很大。因此,科学增施钾肥是红薯高产稳产的重要措施,其主要施用技巧为:
Sweet potato is a hi potassium crop, in fertilizer nitrogen, phosphorus, potassium three elements, the demand for potassium is the largest, followed by nitrogen, phosphorus at least. General sweet potato roots nitrogen, phosphorus and potassium content ratio of 2: 1: 3. Therefore, if the sweet potato is deficient in the early growth stage, the internodes will appear, the petiole will become shorter and the leaves will become smaller. In the late period, the veins of the old leaves lack a serious green and become necrotic, which will have a great impact on the yield. Therefore, the scientific application of potassium is an important measure of high and stable sweet potato production, its main application skills: