Summer is the period in which pear trees have the largest amount of vegetative growth and the fastest reproductive growth in a year. At this time, the pear tree has higher requirements on the conditions of fertilizer and water, and it is necessary to take the opportunity to carry out topdressing.
Before topdressing, the topdressing of the pear tree buds is followed by a special fertilizer for the fruit trees, mainly phosphorus and potassium, supplemented by nitrogen. According to the age and the result of the tree, the plant is applied with 1 to 1.5 kg, and immediately after the application. In combination with spraying, the tree is sprayed with 1 or 2 times of 0.3% amino acid compound fertilizer. In July, after the early maturing varieties were harvested, a quick-acting nitrogen fertilizer was applied immediately to supplement the nutritional deficiency caused by the results. For mid-late maturing varieties, phosphorus and potassium fertilizers should be applied once at this time.
Top dressing When the tree body needs a certain nutrient element in a certain period of time and the root system is difficult to satisfy, or the soil lacks a certain element, it can be used for foliar spray fertilizer, and can also be combined with spraying. Fertilizers that are generally soluble in water can be used as top dressings. Common concentrations are: urea 0.3% to 0.5%, superphosphate 0.5%, potassium sulfate 0.5%, potassium dihydrogen phosphate 0.5%, borax 0.3%, sulfuric acid Iron is 0.05 to 0.1%, zinc sulfate (after germination) is 0.1 to 0.4%, and (before germination) is 1 to 5%. When mixing or when it is hot or hot, the concentration is slightly lower.
Interplanting green manure can be used as a green manure in the young gardens by interplanting legumes of the legume family, Chinese milk vetch, or ryegrass of the grass family. Sowing in mid-September, 5 kg of calcium magnesium phosphate fertilizer, potassium sulfate and ammonium molybdate per acre. In the middle and late June of June, the summer will be castrated before the onset of drought. Generally, the yield per acre is about 500-1000 kg, which is used as a summer cover and fertilizer for young trees.
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