1, pay attention to spraying more water or water in the early and middle stages of fruit growth. In this way, the cell wall of the secondary epidermis and the lenticels of the fruit stalk will be obviously developed, which can increase the critical expansion pressure that causes fruit cracking; Spraying NAA 15 mg/kg and ABA 100 mg/kg near the ear and leaves can increase the pressure of fruit expansion, increase the fruit and prolong the life of leaves.
2. The vineyard is covered with plastic film. It can prevent the roots from accumulating too much rain, resist the evaporation of surface water and reduce the change of soil moisture. In drought, the combination of plastic film mulching and irrigation can effectively prevent grape from cracking.
3. If the fruit carrying capacity of Kyoho grape is too large, it will cause poor fruit coloring and increase fruit cracking. Therefore, we should pay attention to adjusting the fruit carrying capacity to reduce the fruit cracking due to the fixed yield of trees.
4. Appropriate amount of nitrogen fertilizer, more phosphorus and potassium fertilizer and more organic fertilizer should be applied, and the amount of calcium fertilizer should be increased in cohesive soil.
5. Change the traditional coring method and leave more leaves. It reaches more than 25-26 normal leaves per fruit branch, which enhances the water regulation function of the tree.
6. Spraying NAA 20 mg/kg and ABA 100 mg/kg twice at the initial stage of fruit cracking can resist the activity of ethylene in plants and prevent fruit cracking caused by ethephon application.
Extended data
Matters needing attention in crack prevention of Kyoho grape
1. The sooner Kyoho grapes crack, the better. Therefore, the earlier calcium-boron foliar fertilizer is added, the better the effect will be. Fruit cracking should be prevented as soon as possible. Find those calcium-boron foliar fertilizers that don't contain hormones and use them several times. Once the fruit is cracked, it is too late to treat it again.
2. If Kyoho grape lacks boron and calcium fertilizer, it is necessary to supplement boron and calcium foliar fertilizer, which can supplement both calcium and boron.
In case it rains suddenly, you can set up a shelter. Too much rain will also increase the diseases of Kyoho grape, which is very troublesome in plant protection, so sheltering from rain is a way to reduce the occurrence of pests and diseases.
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