How should the peach tree be fertilized?

How should the peach tree be fertilized? How can we fertilize scientifically and rationally? In view of the great difference in the amount of fertilizer applied in peach orchards, unreasonable fertilizer dosage, ratio of nitrogen, phosphorus and potassium, fertilization period and methods, and ignoring the coordination of fertilization and irrigation, the following fertilization principles were put forward: (1) to increase the application rate of organic fertilizer reasonably. According to soil fertility, early, middle and late maturing varieties and yield level, the application level of nitrogen, phosphorus and potassium fertilizer should be reasonably regulated. the fertilizer requirement of early-maturing varieties is 20% less than that of late-maturing varieties. Pay attention to the combined application of calcium, magnesium, boron, zinc or copper fertilizer; (2) the fertilizer distribution should be based on autumn base fertilizer one month after peach fruit picking, before and after the peach fruit expansion period is the key period of topdressing fertilizer; (3) combined with high quality cultivation techniques, it is not suitable to topdressing nitrogen fertilizer and a large amount of irrigation in the first 3 weeks of picking so as not to affect the quality; in the plain area with poor drainage in summer, peach orchards need to do a good job of soil management, such as ridging, plastic film mulching, growing grass and so on. The techniques of plastic film mulching and hole storage of fertilizer and water are recommended in arid areas. Fertilizer application amount and methods (1) the yield level is more than 3000 kg / mu: organic fertilizer 2kg / mu, nitrogen fertilizer (N) 15,18kg / mu, phosphate fertilizer (P2O5) 8kg / mu, potassium fertilizer (K2O) 18kg / mu. (2) the yield level is 2000-3000 kg / mu: organic fertilizer 1 square meter / mu, nitrogen fertilizer (N) 1216kg / mu, phosphate fertilizer P2O5 7kg / mu, potash fertilizer (K2O) 170kg / mu. (3) the yield level is 1500-2000 kg / mu: organic fertilizer 1 square meter / mu, nitrogen fertilizer (N) 1012kg / mu, phosphate fertilizer (P2O5) 5kg / mu, potash fertilizer (K2O) 12kg / mu. For orchards with early defoliation or high load in the previous year, extra-root topdressing should be strengthened. Urea of 1% to 3% can be sprayed 2 or 3 times before budding, and regularly sprayed in the form of urea and potassium dihydrogen phosphate from germination to mid-July. the concentration of potassium dihydrogen phosphate is 0.3% 0.5%. If a large amount of organic fertilizer was applied in the previous year, the basic application of nitrogen and potassium fertilizer could be reduced by 1kg / mu in autumn and 2kg / mu in fruit expansion period. All organic fertilizer, 30%-40% nitrogen fertilizer, 100% phosphate fertilizer and 50% potassium fertilizer were applied by trenching method in the autumn after peach fruit picking; the remaining 60%-70% nitrogen fertilizer and 50% potassium fertilizer were applied in the sprouting stage, hard kernel stage and fruit expansion stage of peach trees in spring respectively (early-maturing varieties 1-2 times, late-maturing varieties 2 times). More peach tree planting techniques