Grape topping should pay attention to what issues
By topping the grape shoots, nutrients can be saved, leaf thickening, full flower buds and full shoots can be promoted, thereby increasing the fruit set rate of the grapes. Grapes should pay attention to the following issues:
1. Topping time. For the new shoots, they are generally picked up at 3-5 days before flowering, and at the latest flowering. For varieties with serious drop and fruit drop, such as Kyoho, Purple Rose, etc., can be picked 8-10 days before flowering. After the first picking, the leaves do not reach the required number of new shoots. After the shoots are grown, leave the leaves and perform the second picking on the auxiliary shoots. For vegetative shoots and cultured shoots, leave 12-15 leaves topping at one time.
2. Topping method. Some fruit growers only pick up the tops when they pick up the grapes. This kind of method does not achieve the effect that topping should play. Because the grape leaves grow to 1/3 of normal leaves, its own carbohydrates produced by photosynthesis can not meet its own consumption, but still need the nutrients produced by other leaves to maintain the nutrients it needs to continue to grow. Therefore, the topmost leaves left after topping should be more than 1/3 of the normal leaves. In this way, after the first picking, there may be only 3-4 leaves before the inflorescence. The second picking is carried out on the shoot at the new shoot. At this time, leave enough leaves on the tip to pick it up. In general, 12-15 leaves are required for each new shoot. After mid-July, the rainfall was sufficient, the air humidity was relatively high, and the temperature was high. At this time, the shoots continued to produce secondary shoots. In addition to these new shoots, 2-3 were left at the top, leaving 3-5 leaves topping. Outside, all the rest are cleared.
In areas where branches are lacking due to frostbite, diseases, and mechanical damage, and empty surfaces, new shoots from old branches or roots should be reasonably retained. It is particularly important for these new shoots to be picked up. If they are allowed to grow, they tend to grow too prosperous and full of buds move upwards. In the following year, pruning is mostly cut off without yield. For this kind of new shoots, when it grows to 10 leaves, take 7-8 leaves topping and force 3-5 shoots.
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