After leaf spraying, the resistance of grape leaves was strong, and the concentration of foliar fertilizer could be appropriately increased. Foliar spraying was 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 is harvested, the basal fertilizer is effective after harvesting and before the leaves fall. The use of the root system to recharge fertilizer during the active period not only enables the damaged roots to recover, but also can 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 reserved for 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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