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土豆是喜钾忌氯作物。给土豆施钾肥,能增强光合作用,使淀粉含量增多,表皮光滑、产量高、质量好。土豆有一个特点是忌氯,吸氯多会阻碍土豆对磷的吸收,结果使土豆淀粉形成的少、产量低、质量差。氯化钾虽然含钾量高,但因为它又含有氯,所以栽土豆不能施用氯化钾。栽土豆也不宜施用人粪尿,最好施用草木炭,可采取草木灰拌种栽的办法。另外,也可采取用草木灰摅口类的办法,每亩地用草木灰100～200斤,还可配施猪圈粪。施用氮素化肥时也不可施用氯化铵。
Potatoes are hi potassium bogey chlorine crops. Potash fertilizer to potatoes, can enhance photosynthesis, increased starch content, smooth skin, high yield, good quality. Potatoes have a feature to avoid chlorine, chlorine and more will hinder the absorption of phosphorus on potatoes, resulting in the formation of potato starch less, low yield, poor quality. Potassium chloride, although high in potassium, but because it contains chlorine, so planting potatoes can not be applied potassium chloride. Planting potatoes should not be applied to human excrement, it is best to use grass charcoal, plants can be taken ash ash planting approach. In addition, we can also take the method of using straw ash mouth type, with 100 to 200 kg of grass ash per acre, but also with pig manure. Ammonium chloride should not be used when applying nitrogen fertilizers.