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Four-year fertilization of fruit trees
The first topdressing should be before flowering. The budding and flowering of fruit trees consumes large amounts of nutrients. If nutrients are not supplied at this time, the flowering period will prolong and the fruit setting rate will be reduced. Therefore, appropriate fertilizers should be applied in appropriate amounts. The second time was after flowering. The topdressing 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 top dressing during fruit enlargement and flower bud differentiation. At this time, the fruit rapidly expands, flower buds begin to differentiate, reproductive growth and vegetative growth are in sharp contradiction, timely application of appropriate amounts of nitrogen, phosphorus, and potassium fertilizers can increase the photosynthetic efficiency of the leaves, promote nutrient accumulation, and satisfy fruit enlargement and flower bud differentiation on nutrition. demand. The fourth time was to stop growing fertilizer in autumn shoots. The main role is to improve the photosynthetic function of the leaves, increase the accumulation of nutrients in the later stages of the tree, and promote the flower buds to continue to differentiate and full and full. 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 harvest, late maturing varieties should be carried out before harvest. In addition to regular fertilization, 250-fold borax aqueous solutions were sprayed during the flowering period; 200-fold urea or calcium phosphate leaching solution or potassium sulfate aqueous solution was sprayed during fruit enlargement, and the results were good. Apply water promptly after each fertilization. China Agricultural Network Editor