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草木灰含钾约为5%—15%,其中80%—90%是水溶性钾,易被作物根系吸收利用,还含有丰富的氮、磷及钙、镁、锌、钼、锰等微量元素,是农业生产上不可多得的好肥料。据测定每百公斤草水灰含有效钾8公斤,相当于15.4公斤硫。酸钾化肥的含钾量,草木灰还具有中和土壤酸性,增强作物抗病抗倒伏及防虫杀菌等多功能作用。北方尤其是东北地区,冬春季节燃烧柴草量大,是积存草木灰的最佳时期。
Ash content of ash is about 5% -15%, of which 80% -90% is water-soluble potassium, easily absorbed by the crop roots, but also rich in nitrogen, phosphorus and calcium, magnesium, zinc, molybdenum, manganese and other trace elements, It is a good fertilizer for agricultural production. It is measured per kilogram of grass water containing 8 kg of potassium, equivalent to 15.4 kg of sulfur. Potassium potassium acid fertilizer, ash also has the acidity of soil and enhance crop resistance to lodging and sterilization and other multi-purpose role. In the north, especially in the northeast, burning firewood in winter and spring is the best time to accumulate ash.