The summer is the period when the pear tree has the largest amount of vegetative growth and the fastest reproductive growth. At this time, pears have higher requirements for fertilizer and water conditions, and they should do a good job in the top dressing.
Before top-dressing, the topdressing plant uses phosphorus and potassium as the primary fertilizer, and nitrogen supplements the special fertilizer for fruit trees. According to the age of the tree and the result, the plant applies 1 to 1.5 kg and is immediately filled with water after application. In combination with spraying, the tree was sprayed with 1 to 2 times 0.3% amino acid compound fertilizer. In July, after the early maturing varieties were harvested, a quick-release nitrogen fertilizer was applied immediately to supplement the lack of nutrients caused by the results. For late-maturing varieties, phosphorus and potash fertilizers should be topdressed at this time.
When the tree body needs a certain amount of nutrient element in a certain period and the root system absorbs and is difficult to meet, or the soil lacks a certain element, it can spray fertilizer on the leaf surface, or it can be combined with spraying. Fertilizers that are generally soluble in water can be used as top-dressing fertilizers. Commonly used concentrations are 0.3% to 0.5% urea, 0.5% superphosphate, 0.5% potassium sulfate, 0.5% potassium dihydrogen phosphate, 0.3% borax, and sulfuric acid. Iron 0.05 to 0.1%, zinc sulfate (after germination) 0.1 to 0.4%, (before germination) 1 to 5%. When mixing or at sunny hot temperatures, the concentration is slightly lower.
Interplanting green manure in the young garden can be used as a green manure for planting leguminosae, milk vetch, or ryegrass. Sow in the middle of September sowing, applying 5 kg of calcium magnesium phosphate fertilizer, potassium sulfate, and ammonium molybdate per acre. In mid-June and late summer, when the summer drought occurs, the yield per acre is about 500-1000 kg, which is used as a sapling summer cover and fertilizer.
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