The first topdressing should be the consumption of large amounts of nutrients before flowering. If nutrients are not supplied, the flowering period will be prolonged and the fruit set rate will be reduced. Therefore, appropriate amount of topdressing fertilizer should be applied.

The second time is after the flower chase fertilizer, this top-dressing fertilizer should be carried out immediately after flowering, in order to reduce the physiological fruit drop, promote the growth of new shoots and expand the leaf area. The 1st and 2nd top dressings should be closely combined, with the main use of available N fertilizers. Mature trees produce 100 kg of human urine or 1 kg of urea per plant.

The third time is when the fruit enlargement and the flower bud differentiation period, the fruit rapidly expands, the flower buds begin to differentiate, the reproductive growth and the vegetative growth contradiction are sharp, and timely applying the appropriate amount of nitrogen, phosphorus and potassium fertilizers can improve the photosynthetic efficiency of the leaves and promote Accumulation of nutrients meets the nutritional needs of fruit enlargement and flower bud differentiation.

The fourth time is the main role of topdressing in the period of stopping growth at the autumn shoot is to increase the photosynthetic function of the leaves, increase the accumulation of nutrients in the later stage of the tree, and promote the differentiation and fullness of the flower buds. The 3rd and 4th top-dressing, mature trees each had 50 kg of excreta, 1 kg of superphosphate, and 0.5 kg of potassium sulfate. The fourth fertilization time: early maturing, medium maturing varieties can be carried out after harvesting, and late maturing varieties are carried out before harvesting. (Liu Wen)

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