In July, it was the key period before and after the harvest of peaches, plums, apricots, litchis and other fruits. Scientific fertilization during this period has important significance for the restoration of tree vigor and storage of nutrients for fruit trees in the coming year. Before and after fruit harvest, fertilization should be based on organic fertilizers, and appropriate amount of phosphorus and potassium fertilizer should be applied. Organic manure, chicken manure, cake manure, and green manure should be the best. Phosphate fertilizer should be powdery superphosphate, potassium potash can be used. This version of the manuscript is aimed at combing the pre-harvest and post-harvest fertilization technologies of mature fruits in the near future to provide reference for farmers' summer fertilization management.
July is an important period for Taoyuan management. At this time, peach trees have a great demand for nutrients, and timely top dressing is very important for the growth of peach trees. Recently, the reporter interviewed Zhang Zhicheng, a fruit specialist and senior engineer at the Northwest A&F University, asking him to tell the fruit growers how to fertilize in July.
Zhang Zhicheng stated that in the peach tree cycle, the absorption of nitrogen, phosphorus and potassium nutrients by peaches generally begins to increase from early June. As the fruit's growth and absorption increase, the nutrient absorption during the fruit enlargement period rises sharply in early July. In particular, the increase in potassium uptake was even more pronounced. By the middle of July, the absorption of the three elements peaked until a slight decrease before harvest.
Therefore, topdressing at this time has an important effect on the growth and results of peach trees. Top dressing should be carried out in the hard core period from late May to early June, fruit enlargement period from late June to early July and staged after fruit harvest. The amount of top dressing is based on 250 g nitrogen absorption per 100 kg of fruit, and phosphorus, potassium fertilizer is applied in a ratio of nitrogen, phosphorus and potassium (2:1:3). Zhang Zhicheng reminded the fruit growers that topdressing should be applied 3 times, and the amount of topdressing fertilizers should account for 30% to 60%, 20% to 50%, and 20% of the total.
Zhang Zhicheng told reporters that many fruit growers have doubts about whether or not peach trees need to use micronutrients. In fact, they must make decisions based on factors such as the abundance of trace elements in the local orchard soil, the amount of organic fertilizers used, and the amount of results, and strive to be targeted. He said that the development of peach trees in the past few years, leaf yellowing and lobular disease occur from time to time, timely spray of liquid or creamy multiple microelement fertilizer, have a certain effect on the elimination of symptoms.
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