How to improve the fruit setting rate of grapes?

How to improve the fruit setting rate of grapes? What are the ways to make grapes fruitful? Also ask experienced netizens to help introduce the grape fruit setting rate is the most concerned issue for the grape cultivation netizens, so the farming network has sorted out the methods that can improve the grape fruit setting rate, which are listed in detail below for netizens' reference. Method 1. To ensure adequate nutrition of grapevines: balanced or formula fertilization is the main way to stabilize grapevine potential and improve fruit setting rate. The base fertilizer of grape should be carried out after picking, and the amount of fertilization is about 60% of the whole year, usually mainly compost, barnyard manure and organic manure. If the vineyard soil is acidic, calcium magnesium phosphate fertilizer and plant ash can be applied. Topdressing for grapes can be divided into three times: the first time, combined with irrigation before and after grape germination, the application rate is 15% of the total amount of the whole year; the second time, the grape berry expansion period is mainly compound fertilizer, human feces and urine or nitrogen, phosphorus and potassium, accounting for 30% of the whole year; the third time in the grape fruit coloring period with phosphorus and potassium fertilizer, less available nitrogen fertilizer, accounting for about 10% of the annual fertilizer application. In addition, borax or boric acid can be sprayed during the flowering period to promote fruit setting. Method 2, control the growth of new shoots of grapes: too strong and too weak grape trees are not conducive to blossom and fruiting, and only the sturdy and moderate tree potential can stabilize fruit setting. If the tree is too strong, the exuberant growth of branches will inevitably consume a lot of nutrients, resulting in poor flowering ability of the new shoots of grapes in the next spring. For example, the varieties of Jufeng line can take strong coring before flowering, and then supplement organic nutrition with auxiliary shoot leaves after flowering. For tight panicle varieties, in order to reduce their fruit setting rate, the coring period of the main shoot can be postponed and the ear can be loosened. For grape varieties with strong secondary shoots, fewer secondary shoots should be left, and if necessary, "running single strip plus retraction" should be adopted to use winter bud secondary shoots to increase leaf area, while for varieties with weak secondary shoots, more secondary shoots should be left. Method 3. Keep fruit reasonably for grapevines: if grapes blindly pursue yield without thinning flowers and fruits, it will not only reduce grape quality, but also weaken grape potential, resulting in poor growth, poor quality of grape flower buds, inadequate ripening of grape branches and less storage nutrients in grape plants. it will also affect the blossom and fruit of the next year and aggravate the drop of flowers and fruits of the grapes. The yield should be properly controlled, which can not only ensure the normal fruit, but also have a good tree potential which is conducive to high yield year after year. The normal yield of grapes per mu is about 1500-3000 kg. Method 4, timely prevention of grape diseases and insect pests: grape focus on the prevention and control of black pox, downy mildew, white rot and leafhopper, etc., the above diseases and insect pests will cause grape flower and fruit drop. In addition, pay attention to the weather forecast to prevent the harm of late frost. Click to view > > Prevention and control methods of grape downy mildew prevention and control of grape small fruit