Plant ash is rich in potassium, phosphorus, calcium, magnesium, sulfur and various trace elements. It is a good farm fertilizer, and it is also a good medicine for preventing diseases and pests of fruit trees. 1. Prevent powdery mildew in fruit trees. At a distance of 15cm from the diseased plant, a 10-20cm deep groove was dug, 10-20kg of plant ash was applied in the ditch, and a thin layer of soil was covered. The cure rate was over 80%. 2. Prevent blight and anthrax. The saplings of diseased seedlings are planted with ash, and the amount of mu is 30-50kg, which can effectively prevent the occurrence of two kinds of diseases. 3, control root rot. The roots of the roots of the diseased trees were removed, the soil on the clean roots was removed, and the root bark was scraped off. After 24 hours of air-drying, each plant covered 2.5-5 kg ​​of fresh plant ash, covered with mud, and the cure rate was as high as 90%. 4, control of apple tree rust disease. In spring or autumn, about 50cm from the root of the diseased tree is dug out of the annular groove, the groove width is 50cm, and the depth is 60cm. The basal ash is applied as a basal fertilizer to the ditch, and it is appropriate to fill it with water and cover the new soil.
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