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甘薯(红薯)是喜钾作物,整个生育期间需要从土壤中吸收大量钾素参加体内代谢,特别是在中后期,茎叶迅速生长,薯块快速膨大,是建成产量的关键时期,这时植株对钾素的需求量更大。当叶片含钾量低于0.5％时,植株就表现出明显的缺钾症状:茎叶生长缓慢,茎蔓变短,老叶叶脉间缺乏叶绿素,表现严重失绿,叶
Sweet potato (sweet potato) is a potassium-like crop. It needs to absorb a large amount of potassium from the soil during the whole growth period to participate in the body metabolism. Especially in the middle and late stages, the rapid growth of stems and leaves and rapid expansion of potato tuber are the key period for the completion of the production. The demand for potassium is even greater. When the leaf potassium content is less than 0.5%, the plants showed obvious symptoms of potassium deficiency: slow growth of stems and leaves, short stems and leaves, the lack of chlorophyll in old leaf veins, showing serious chlorosis, leaves