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红薯是块根作物,有喜钾肥的特点。因为钾能促进根部形成层的活动和碳水化合物的合成和输送,能使叶片增厚,有利于薯块的膨大,而且还能防止叶蔓徒长,所以,红薯多施钾肥能增产。草木灰是红薯所喜爱的农家钾肥,如果在红薯叶面喷施草木灰,一般能增产13%。“红薯不抓灰,根多产量低”之況是有科学道理的。红薯叶面喷施草木灰的具体做法是:在蔓叶封垄之后进行,因为这个时期正是薯块的膨大期,此时叶面积大,吸收量多,效果好。先用15~20公
Sweet potato is a root crop, there are hi potash characteristics. Because potassium can promote the formation of root activity and carbohydrate synthesis and transport, can make the leaf thicker, is conducive to the expansion of tubers, but also to prevent the leaves of a long, so more potash can increase yield sweet potatoes. Plant ash is sweet potato favorite farm potash fertilizer, if the application of ash in the sweet potato leaves, can generally increase 13%. “Sweet potato does not catch ash, low yield,” the situation is scientific. The practice of spraying sweet potato leaves ash is: in the closed leaves after the ridge closure, because this period is the expansion of potato blocks, when the leaf area, the absorption of more effective. First with 15 to 20 public