1, base fertilizer After the fruit is harvested, apples should be applied immediately after the fruit is harvested. Generally, in the middle and late October, the method of stripe ditching is used. The depth of the ditch is 0.5-0.6 meters, 3500-3900 kg of organic fertilizer per acre, and 100 kg of calcium, magnesium and phosphate are mixed with the soil. After the application, this period of basal fertilization has the following advantages: First, the apple root distribution layer soil temperature is more appropriate, root growth, absorption function is also more live, fertilizer is conducive to root absorption after fertilization. Second, after fertilization, it is beneficial to increase the photosynthetic efficiency of leaves and increase the accumulation of carbohydrates. Third, the use of organic fertilizers in the fall has sufficient time for the roots to absorb and operate, and they are stored in the tree. Therefore, the application of manure in the fall is an important part of the apple orchard fertilization system, and is also the basis for fertilization throughout the year. 2, top dressing In mid-March in spring, fertilizer is applied once, 100 kg of bio-organic fertilizer, 40 kg of silicon fertilizer, 40 kg of special fertilizer for "Hongjie" brand fruit trees, and 30 kg of potassium sulfate. Fertilizer is applied by radiation channel method, and fertilizer and soil are mixed and applied. In the summer of mid-June, top dressing, "Hongjie" brand fruit tree special fertilizer 30 kilograms, potassium sulfate 20 kilograms, the use of radiation channel fertilization, fertilizer and soil mix and apply, after each fertilization irrigated. Hydrolyzed Sponge White Powder Sponge Chengdu Sino Tech company , https://www.cnherbfun.cn