Grapes are a key management period that is easily overlooked before harvesting. At this stage, the photosynthesis of the leaves will show a second peak (the first time after the first half of the germination to the leaf growth period), and it will drop rapidly until the deciduous period. Therefore, we must pay attention to this critical period after harvest, strengthen management, protect leaves and leaves, and increase the storage of photosynthetic products. If the management of the later tree is neglected, the leaves will be damaged prematurely, the photosynthesis will be reduced, and the tree will be stored with nutrient deficits, so that the early spring will lack nutrients, the germination will be late and not neat, and even the inflorescence will degenerate, the flowering results will be reduced, and the results will be less. Or no result, but also easy to cause the second year of leaves and leaves, poor flower bud differentiation, which affects the third year results.
First, protect autumn leaves
Protecting the leaves after harvesting and enhancing the photosynthetic capacity of the leaves play an important role in increasing the storage nutrients of the trees. In the later stage of growth, it is necessary to strictly control the use of antibacterial and sulfur preparation pesticides to prevent premature aging of leaves and reduce photosynthetic strength. Under normal circumstances, in addition to the Kyoho variety, the fruit should be used with little or no old leaves after harvest. When harvesting fruits, pay attention to reducing damage to the leaves.
Second, fertilization and supplement
After the fruit is harvested, the base fertilizer is applied as early as possible. In the case of many results and weak tree potential, quick-acting nitrogen fertilizer can be applied to enhance photosynthesis and restore tree potential in the later stage.
The base fertilizer is suitable for autumn, because at this time the root growth period is at the peak, the root is easy to heal, cutting all the fine roots can play the role of root pruning, which can promote many new roots in the same year, and can absorb the soil in the early spring. Nutrient material in the middle. In the autumn, the upper part of the new organs has gradually stopped growing, and the absorbed nutrients are mainly accumulated and stored, which can improve the nutrient level of the tree, which is beneficial to the flower bud differentiation and enhanced wintering ability, and the germination in the coming year, the further formation of flower buds and the early shoots after flowering. Growth, due to the high nutrient level of the tree, the quality of the flower bud is good, can increase the fruit setting rate, promote the division of young fruit cells, and the number of cells in a single fruit. To lay the foundation for abundance in the coming year. The base fertilizer application time should be combined with the local climatic conditions, and September is the most suitable. At the latest, around mid-October, the temperature drop in the evening is not conducive to root absorption. The base fertilizer is mainly organic fertilizer, with phosphate fertilizer, about 3,000 kg of organic fertilizer (farm fertilizer) and 50 kg of phosphate fertilizer.
Third, pest control
Pest control is very important after harvesting, especially downy mildew, powdery mildew, insect pests will cause premature defoliation of whole trees, forcing winter buds to sprout in late autumn, seriously affecting tree nutrient accumulation and growth results in the coming year, we must attach great importance to post-harvest disease control . Generally, 300 minutes of Ethylene Phosphate or 1000 times of Toxicillium is sprayed once every 10 days before harvesting to the leaves, which can effectively prevent the occurrence of downy mildew. Control the floating dust with 1000 times of omethoate. (寒梦)
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