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草木灰属碱性,含钾和钙最多,磷次之,还含有镁、硫、铁、硅及多种微量元素,是肥效最高的速效性肥料。草木灰要单独存放,不能放入牲畜圈内,也不要和氨水、碳铵、硫铵、氯化铵等氮肥混放。要放在干燥处,防止返潮或雨淋,以免将可溶性养分淋溶带走。草木灰作基肥,一般每亩25—40公斤,结合耕地撒在地表翻入土内即可。作追肥时每亩20—30公斤,作物灌水后施于行间,中耕带土施于庄稼根际较好,作追肥时也可叶面撒施,既供给养分又能减轻病虫害。盐碱地不宜施用,草木灰拌人粪尿,晒大粪干的法可破坏人粪尿中40％左右的氮素,也造成草木灰中钾的流失。
Ash is alkaline, potassium and calcium up, followed by phosphorus, but also contains magnesium, sulfur, iron, silicon and a variety of trace elements, is the most effective fertilizer fertilizer. Ash should be stored separately, can not be placed in the livestock circle, nor with ammonia, ammonium bicarbonate, ammonium sulfate, ammonium chloride and other nitrogen mixed with fertilizer. Keep in a dry place, to prevent damp or rain, so leaching of soluble nutrients away. Grass ash as a base fertilizer, generally 25-40 kilograms per acre, combined with arable land scattered in the earth can turn into the ground. 20-30 kg per acre for topdressing, crop irrigation applied to between lines, cultivating soil with crop rhizosphere is better, for top dressing can also be applied, both to provide nutrients and reduce pests and diseases. Salt and alkali should not be applied, mixed with manure grass and grass waste, sun drying law can destroy about 40% of human excrement of nitrogen, but also caused the loss of potassium ash in plant ash.