How to prevent grape cracking

Why was grape cracking so severe in Northeast China in 2007? There are many reasons, but there are two main reasons. One is the internal cause. The grape varieties have thin skins, which means they are congenital insufficiency. The second is external factors, due to excessive rain during the fruit swelling period.

In the spring and summer of this year, the climate in Northeast China was dry, and there was no rain for more than 40 days. When the grapes were ripening quickly, it was the period of fruit expansion, and there were several heavy rains. In this way, there was too much water in the first drought and later period, so some Grape varieties with thinner skins, such as Zana, Jingyou, Hongqi Special Early Rose, etc., even some Kyoho strains have cracked fruit, causing great losses to fruit growers.

So how to prevent grapes from cracking during production?

1. When selecting varieties for garden construction, European and American varieties with thicker peels or European and American hybrid varieties are preferred. These varieties have thicker peels and are not very sensitive to water mutations, so they are generally not easy to crack.

2. Reasonable irrigation at the right time can effectively prevent fruit cracking. Let’s not talk about the water for inducing budding in spring and the freezing water after autumn, because these two waters have nothing to do with grape cracking, and the other waters are very particular. In order to prevent water shortage 10 days before flowering, you can fully water once, and watering should be prohibited within 10-15 days after flowering. At this time, watering or rain may cause fruit drop. From then on, the grapes require the most water before the fruit is ripe. Water should be given once every 10 days. Fertilizer must be added to each water. The compound fertilizer should be added after the water. The water should be given once every 15 days before the fruit is ripe. Phosphorus should be added to the seawater. Potash fertilizer. At the same time, the leaves are supplemented with potassium dihydrogen phosphate and foliar fertilizer containing trace elements. Only reasonable watering can prevent the fruit from cracking.

3. Repair the drainage ditch and drain the accumulated water in time in case of heavy rain.

4. Other measures. ①In the spring, buckle the mulch in the grape ditch, which not only prevents the evaporation of water, but also prevents too much water absorption when it rains, while keeping the roots warm. ②Experience has proved that calcium deficiency can easily lead to grape cracking. Therefore, it is very important to supplement calcium for varieties with thin skin. You can apply "Calcium Demei" after fruiting, or spray 600-1000 times of high-efficiency Merrill Calcium 1 directly on the fruit. ～2 times (produced in Baoji, Shaanxi), the effect is obvious. ③Although some varieties are also European and American hybrids, the skin is not too thin, but the ears are too tight, and the fruit swells and cracks when the rain is heavy. At this time, "gibberellin" or "920" should be used 8-10 days before flowering. Add 8-10 kilograms of water to 1 gram, or add 20-30 kilograms of water to 1 pack of American "Qibao", so that the ears will lengthen and enlarge, from tight to loose, and the grains can't be cracked if there is room for growth.

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