First, the main cause of grape fruit cracking Kyoho
Kyoho grape cracking occurred in the period of harvest. Kyoho grape fruit has poor anti-feathing pressure and is sensitive to ethylene. When the fruit is near mature, the content of ethylene in the fruit is high, so the fruit is easy to form cracking fruit; the fruit grows in a dry and dry period, the fruit matures when it encounters more rain or even rain, and such weather is over. Rapid high temperature and dryness are very easy to crack fruits. The tree potential is weak, but the amount of fruit is too large, the fruit is too tight, and it is easy to cause serious fruit drop. The use of nitrogen fertilizer is more; the grape on the clay ground is prone to drought, and the rapid changes in the external environment are easy. As a result of traditional pruning methods, following the traditional pruning method, the picking of the heart resulted in fewer leaves to be taken, which reduced the ability of the tree to regulate the moisture, and it was easy to cause fruit cracking in the event of rain. The application of ethephon resulted in ripening of the cracked fruit, in which large and early cracking was serious.
Second, crack prevention measures
1. In the early and middle stages of fruit growth, attention should be paid to water spray or irrigation. In this way, the skin pores of the secondary epidermis cell wall and fruit stems will be significantly developed, which can increase the critical turgor pressure caused by cracking; for the ear and the nearby leaves, spraying with 15 mg of TCA Adding 100 mg/kg of abscisic acid per kilogram can increase the fruit's bulging pressure and enlargement of fruit and prolong the life of the leaf. At the late stage of growth, try not to delay or delay the administration of ethephon ripening.
2. Covering the mulch in the vineyard prevents roots from accumulating too much rain, inhibits surface water evaporation, and reduces soil moisture changes. In drought, the combination of mulching film and irrigation can effectively prevent grapes from cracking.
3. If the Kyoho grape results in an excessive amount, it will cause poor fruit coloration and increased fruit cracking. Therefore, it is necessary to pay attention to adjusting the amount of results, because the trees will be produced, and fruit cracking will be reduced.
4. Appropriate amount of nitrogen fertilizer should be applied. Potassium fertilizer should be increased, organic fertilizer should be applied more, and the amount of calcium fertilizer should be increased in sticky soil.
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. To achieve 25 to 26 pieces of normal leaves per fruit branch, enhance the tree's ability to regulate moisture.
6. Naphthylacetate 20 mg/kg plus abscisic acid 100 mg/kg twice in the early stage of cracking can inhibit the activity of ethylene in the plant and can prevent cracking caused by the application of ethephon.
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