In July, it was the key period before and after harvesting of peach, plum, apricot, lychee and other fruits. Scientific fertilization during this period is of great significance for fruit trees to restore tree potential and store nutrients to ensure high quality and high yield of fruits in the coming year. Fertilization before and after fruit picking should be based on organic fertilizer, with appropriate amount of phosphorus and potassium fertilizer. Organic fertilizers are good for sheep fat, chicken manure, cake fertilizer, green manure, etc. Phosphate fertilizer is better with powdered superphosphate. Potassium sulfate can be used for potassium fertilizer. This edition of the manuscript is aimed at combing the technology of pre-harvest and post-harvest fertilization of mature fruits, and provides reference for farmers to apply fertilizer management in summer.

July is an important period for the management of Taoyuan. At this time, peach trees have a great demand for nutrition, and timely topdressing is very important for the growth of peach trees. Recently, the reporter interviewed Zhang Zhicheng, a fruit expert and senior engineer at the Northwest A&F University, and asked him to tell the fruit farmers how to fertilize in July.

Zhang Zhicheng said that in the annual cycle of peach trees, the absorption of nitrogen, phosphorus and potassium nutrients in peach trees generally increased from the beginning of June, and the growth and absorption of fruits increased continuously. By the beginning of July, the nutrient uptake during fruit expansion increased sharply. In particular, the increase in potassium absorption was more pronounced. By mid-July, the absorption of three elements reached a peak and did not decrease until before harvest.

Therefore, at this time, topdressing plays an important role in the growth and fruiting of peach trees. Topdressing should be carried out in the hard core period from late May to early June, fruit expansion period from late June to early July, and stage after fruit harvest. The amount of top dressing is based on 250 grams of nitrogen absorbed per 100 kilograms of fruit, and phosphorus and potassium fertilizers are applied in proportion to nitrogen, phosphorus and potassium (2:1:3). Zhang Zhicheng reminded the fruit farmers that the topdressing should be applied in three times, and each of the topdressing amounts accounted for 30% to 60%, 20% to 50% and 20% of the total.

Zhang Zhicheng told reporters that many fruit farmers have doubts about whether peach trees need to apply micro-fertilizer. In fact, according to the factors such as the lack of trace elements in the local orchard soil, the amount of organic fertilizer application and the amount of results, the decision is made to make a specific decision. He said that in the past few years, the greenhouse peach trees, leaf yellowing and lobular disease have occurred. Spraying liquid or creamy multi-micro fertilizer in time has a certain effect on eliminating symptoms.

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