Postharvest Management of Greenhouse Grapes
The management measures after harvesting the greenhouses have a direct impact on the yield and economic benefits of the following year, and are an important part of viticulture.
1. Remove the film in time. As the cultivation conditions of the greenhouse change the inherent natural growth rules of the grapes, the winter buds formed by the branches are affected by the illumination and nutrition in the shed, which may cause poor flower bud differentiation, poor quality results in the following year, or even out of production. In order to ensure that the grapes form a well-differentiated winter bud, the shed film should be removed promptly after the grapes are harvested. Before releasing the film, there should be 10 to 15 days of exhalation exercise, so that the plant gradually adapts to the external environmental conditions and then remove all, so as to avoid the phenomenon of "flashing seedling emergence".
2. Update trim. In order to ensure the high yield of greenhouse vines, it is particularly important to update the pruning after harvest to make it a good result. The pruning method varies depending on the variety, shaping method, and planting density. In terms of species, the more prosperous varieties should be completely removed from the above ground, re-germinate the mother-branch of the resulting culture, or the results of the current year, the results will be re-truncated, and the result will be too late to be trimmed. At the beginning of the month, otherwise, due to missed the best period of flower bud differentiation due to the reconstruction of new shoots, poor flower bud differentiation resulted in poor flowering effect. The relatively weak growth cultivars should select 1 to 2 thick shoots from the near ground, as the result of the leap year's mother, and all the other sparse or leave the original results of branches and branches to be cultured better.
3. Catch fertilizer and water immediately after harvesting. During the whole growth period from the bud to the ripening stage, the grape experienced a process of flowering, long vines, and fruiting. It consumes a lot of nutrients and has a weaker vigor. At this time, it is a critical period for the development of the mother tree, so it must be timely fertilized. Water promotes root growth, increases tree vigor, and increases tree storage nutrition to increase the number and quality of flower bud differentiation.
4. Pest control. After harvesting, the greenhouses are in the high temperature and rainy season. Grape downy mildew is particularly serious and attention should be paid to prevention and control. Metalaxyl 800 times or Dasheng M-45 can be used alternately with Bordeaux mixture. Spray every 10 to 15 days. If pests such as locusts, red spiders, and thrips occur, they can be killed at a rate of 2000 times. Kung Fu, avermectin and other pesticides control.
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