Post-harvest Fertilizer Precautions

After the grapes are harvested and before the winter, the nutrients of the tree are transferred from the harvest to the fruit before harvest, and the second peak of growth occurs in the root. At this time, fertilization is crucial. This is the reason for the high yield and quality of the grapes in the second year. It is decisive. Foliar fertilizer application During this period, the resistance of grape leaves is strong, and the concentration of foliar fertilizer can be appropriately increased. Foliar spray is performed with 0.5% urea and 0.5% potassium dihydrogen phosphate. Immediately after top-dressing and fruit-picking, apply top-dressing chemical fertilizers immediately. For late-maturing varieties, top-dressing plants should be applied before fruit harvesting. Each mu of potassium sulfate ternary compound fertilizer or fruit tree special fertilizer should be 20 kg. After the basal-fertilizer was harvested, the basal fertilizer was effective after harvesting and before the leaves were fallen. The roots were used to make up for the fertilizer during the active period. Not only could the damaged roots recover, but they could also play a positive role in the nutrient accumulation of the tree. Apply 3,000 kg of high-quality mixed fertilizer per acre, 15 kg of pure nitrogen, 15 kg of pure phosphorus, 25 kg of pure potassium, 25 kg of biological calcium fertilizer, 2 kg of zinc sulfate, 2 kg of ferrous sulfate, 0.5 kg of borax, 60% nitrogen removal 50% of potassium is left as topdressing, and the rest of the fertilizer is applied in a fertilization ditch with a depth of 30 cm and a width of 40 cm. Whether it is to apply fast-acting fertilizers or base fertilizers in autumn, it must be watered in time to sink the soil, promote the rapid decomposition of fertilizers, restore tree vigor, and accumulate nutrients to provide adequate nutrition for the growth, flowering, and fruiting of the second year.

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