地瓜施用钾肥的方法地瓜是喜钾作物，在肥料三要素中，以钾的需要量最大，氮次之，磷最少，块根中氮、磷、钾含量比例约为２：１：３。钾素能延长叶片功能期，促进光合作用及淀粉酶的活性，加速淀粉合成和运转，同时钾能加强根部形成层的活动，有利于块根的形成和膨大。如... The method of applying potash fertilizer to sweet potato is sweet potato crop. Among the three elements of fertilizer, the potassium requirement is the largest, followed by nitrogen, and the least phosphorus. The ratio of nitrogen, phosphorus and potassium in the root tuber is about 2: 1: 3. Potassium can prolong the functional period of leaf, promote the photosynthesis and the activity of amylase, accelerate the synthesis and operation of starch, at the same time potassium can strengthen the activity of the root cambium, which is good for the formation and enlargement of root tuber. Such as...