植物燃烧后的残余物,称为草木灰。因为草木灰是植物燃烧后的灰烬,所以凡是植物所含的矿质元素,草木灰中几乎都含有。其中含量最多的是钾元素,一般含6%~12%,其中90%以上是水溶性,以碳酸盐形式存在;其次是磷,一般含1.5%~3%;还含有钙、镁、硅、硫和铁、锰、铜、锌、硼、钼等微量营养元素。草木灰不但能供给花卉矿质元素,而且对防治花卉病虫害有较好的作用。1.防治叶枯病。用草木灰、茶饼、硫黄粉各1千克,石灰1.5千克,捣碎成粉后混合 Plant residues after burning, known as ash. Because plant ash is the ashes of the plant after burning, so all plants contain mineral elements, ash almost contain. The most abundant is potassium, generally 6% to 12%, of which more than 90% are water-soluble, carbonate form; followed by phosphorus, usually containing 1.5% to 3%; also contains calcium, magnesium, silicon , Sulfur and iron, manganese, copper, zinc, boron, molybdenum and other micronutrients. Ash can not only provide the mineral elements of flowers, but also have a good effect on preventing and controlling flower pests and diseases. 1. Control of leaf blight. With ash, tea cakes, sulfur powder 1 kg each, 1.5 kg of lime, mashed into powder after mixing