There are many reasons for grape cracking, which can be summarized as follows: First, grape cracking occurs in the forthcoming harvest period. Some grape varieties have poor anti-feathing capacity and are sensitive to ethylene, while ethylene content is close to ripening. High, so the fruit is easy to form cracked fruit; Second, early fruit growth and drought, when the fruit is ripe, it meets more rain or even rain, and such a sudden high temperature and dry weather, are prone to cracking; Third, the weak tree, but the amount of fruit Large, fruit is too tight, but also easily lead to severe cracking; Fourth, the application of nitrogen fertilizer is more; Fifth, the grapes on the sand land easy to drought, rapid changes in the external environment easily lead to cracking; follow traditional pruning methods, picking lead to retention With less leaves, the tree's ability to regulate moisture is reduced, and it is easy to cause cracking in the event of rain;
Cracking prevention and control methods: 1 In the early and middle fruit growth period, pay attention to multiple sprays or irrigation, so that the skin pores of the sub-epidermal cell wall and fruit stems will be significantly developed, which can increase the critical turgor pressure caused by cracking; on the ear and nearby leaves, Naphthalene acetic acid 15 mg/kg plus abscisic acid 100 mg/kg can be used to increase the fruit swell and enlargement of fruit and extend the life of the leaf. At the late stage of growth, try not to delay or delay the administration of ethephon ripening. 2 The mulching film on the vineyard can prevent excessive accumulation of rainwater in the roots, inhibit the evaporation of surface moisture, and reduce soil moisture changes. In drought, the combination of mulching film and irrigation can effectively prevent grapes from cracking. 3 If Kyoho grape results in excessive quantity, it will cause poor fruit coloration and increased fruit cracking. Therefore, it is necessary to pay attention to the adjustment of the amount of results, because the tree is set to produce, and fruit cracking is reduced. 4 Appropriate amount of nitrogen fertilizer should be applied. Potassium and potassium fertilizers should be added, organic fertilizer should be applied more, and viscous soil should also increase the amount of calcium fertilizer. 5 Change the traditional topping method and leave more leaves. All the shoots above the ear were left with 2 leaves topping and all winter buds and summer buds between the branches of the shoot were removed. Achieve 25-26 pieces of normal leaves per fruit branch and enhance the function of tree to regulate moisture.
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