How to manage apples in summer and autumn?

How to manage apples in summer and autumn? Please guide the management of apple trees in summer and autumn with reference to the following methods: (1) fertilization under trees, generally based on quick-acting compound fertilizer, topdressing according to tree age and number of hanging fruits, and topdressing black Youliang 2-3 kg of fruit trees: (2) foliar fertilizer spraying, in general, the efficiency of external root fertilizer is 5 times higher than that of internal root fertilizer, and the cost is small. What is the cause of apple rot disease? It does not cause pollution to the ecological environment, and it is sprayed with Hongxin amino acid 400-500 times + Aiduoshou + Shuofeng 481 continuously every 10-15 days before 9: 00 a.m. and after 4: 00 p.m., in order to promote thick green leaves, strong trees and enlarged fruits. The second is to improve photosynthesis and promote flower bud differentiation. Apple trees have a strong demand for light. Only in the case of good photosynthesis can we promote the synthesis of organic matter and improve the accumulation of nutrients. On the other hand, the canopy is closed, especially the branches are moved out, and the canopy layer is too thick, which reduces the crown effective coefficient and the leaf index. According to the relative light intensity of 90% at the top of the crown, 1 meter within the crown, the light intensity is reduced to 60%, and then 1.5 meters deep, it reaches the critical line of leaf photosynthesis, that is, 30%, and the light intensity of 2.5 meters is the ineffective area. Flower bud formation generally requires light intensity of more than 40%. At the same time, in addition to high nutrient concentration, it also needs a certain amount of short-wave light with a wavelength of 300 mm to promote ethylene synthesis and sugar movement. Therefore, for closed fruit trees, thin and weak interlayer branches, front competitive branches, shaded overgrown branches and fruitless multi-branched whorled branches should be removed to open the light path to concentrate nutrition and reduce consumption, and foliar fertilizer should be sprayed to promote flower bud differentiation and fruit expansion. Third, after strengthening the prevention and control of diseases and insect pests and promoting high-quality and high-yield summer apple bagging, people relax the pest prevention and treatment of fruit trees. in fact, the technology of protecting flowers and fruits of high-temperature apple trees in summer is highly humid, which can easily induce early defoliation disease, red spiders, leaf rollers and so on. In recent years, early defoliation disease occurred seriously in some places, causing serious economic losses to fruit growers. The tree body was greatly weakened, the yield decreased in the current year, the flower bud developed poorly in the coming year, and the leaves fell in one year, resulting in a yield loss of 2 years. The pathogens of early defoliation were mainly Leaf spot and Brown spot, and the occurrence of Leaf spot was the most serious. The occurrence of early defoliation is related to poor airtight ventilation and poor light transmission, high temperature, high humidity and weak tree potential. Brown spot must occur before the disease occurs. That is, spraying protective fungicides before late June, lovely, 50% propiconazole Zhengxin / microemulsion, or tebuconazole for prevention and control, effectively control the occurrence and spread of diseases, protect the quality and health of leaves, improve photosynthate, and achieve high fruit quality and high yield. Click to get more apple tree planting techniques click to get more fruit planting techniques