Grape shoots must be picked up. Through topping, it saves a lot of nutrients needed for new shoot growth, promotes thickening of leaves, full flower buds and full shoots, which is essential for improving the fruit set rate, yield, and quality of grapes. Grape shoots topping, it is important to grasp the timing.
Topping time: For the new shoots, they are generally picked up at 3-5 days before flowering, and at the latest flowering time. For varieties with serious drop and fruit drop, such as Kyoho, purple rose and other varieties, they can be picked 8-10 days before flowering. After the first picking, the leaves do not reach the required number of shoots. After the shoots are grown, leave the leaves and perform the second picking on the shoots. For vegetative shoots and culture sticks, leave 12-15 leaves to pick up at once.
The method of picking up the heart: When some fruit growers pick up their hearts at the new shoots of grapes, they only go to the top. This kind of method does not achieve the effect that topping should play. Because the grape leaves grow to 1/3 of the normal leaves, the carbohydrates produced by themselves through photosynthesis are not sufficient for their own consumption, and they still need to be supplemented by nutrients produced by other leaves. Only when the leaves grow to more than 1/3 of the normal leaves, the nutrients produced can maintain the nutrients needed for their continued growth. In addition, surplus nutrients can be used to supply other organs than the leaves. Therefore, when topping, you should master that the top leaves left after picking should be more than (at least equal to) 1/3 of the normal leaves. In this way, after the first picking of some varieties, there may be only 3-4 leaves before the inflorescence, but do not worry about too few leaves. The second picking is performed on the auxiliary shoots that occur on the new shoots. At this time, leave enough leaves on the auxiliary tips to pick them up. In general, a total of 12-15 leaves were left for each result.
Until mid-July, rainfall is sufficient in most areas, the air humidity is relatively high, and the temperature is high. At this time, sub shoots continue to emerge. For these new shoots, except for leaving 2-3 at the top and leaving 3-5 leaves to pick the heart, all the remaining parts are removed. The lack of shoots due to frostbite or disease, mechanical damage, and free space on the surface of the shelf, regardless of new shoots from old branches or roots, should be reasonably retained. Picking up these new shoots is particularly important. If they are allowed to grow, they tend to grow too vigorously, and the buds will move upwards. The cuts will be trimmed the following year, and they will be cut off without yield. For this kind of shoot, when it is about 10 leaves long, it takes 7-8 leaves to pick up the heart, forcing 3-5 shoots to take place. When it grows to 10-12 leaves, it will be picked to cultivate the next year. Result mother branch.
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