Don't forget to peel the grapes
The purpose of girdling during the growing period of grapes is to prevent the downward transportation of nutrients from the upper part of the branches or trunks, and increase the nutrient assimilation of organs above the position of the girdling knife (such as inflorescences and ears and grains) and the nutrient accumulation of plant endogenous hormones to promote It has the effect of setting fruit, increasing the size of the fruit, increasing the sugar content and improving the maturity, and slowing down the growth of the vine.
Girdling method
Cut the bark into a double ring with a knife horizontally on the grape vines, and peel off a complete ring of bark without hurting the xylem. The girdling width is generally 2 to 5 mm to block the nutrient delivery of the branches. , Increase the nutrient accumulation of the organs above the girdling position.
Girdling position and width
Grape ring peeling is carried out on the main stem, main vine and fruiting branch, and the effect is better, but each has its shortcomings: ring peeling on the fruiting branch, because the new shoots are tender and brittle and easy to break; on the perennial main vine or short branch The girdling is difficult to operate because the surface is rough and irregular. The width of the knife edge for girdling should be 3 to 4 mm on the main stem and main vine, and 2 to 3 mm on the resultant branch. The cutting edge is required to stand vertically, reaching the xylem but not hurting the xylem.
Period of girdling
If the purpose is to promote fruit setting, girdling should be carried out at the initial flowering stage to enhance the nutrition of the tree above the girdling opening. If the purpose is to increase the size of the fruit, it should be carried out immediately after the natural fruit drop ends, and the girdling is delayed, and the effect of increasing the particles will be poor. When the yield is higher than normal, the effect of girdling to enlarge the fruit is not obvious. At this point, it is mainly applied to seedless varieties, and the effect of girdling on nucleated varieties is not critical. The specific operation is generally carried out with fruit thinning, otherwise there will be too much fruit set and fruit quality will decrease.
Precautions
1. It is necessary to choose strong-growing trees or branches for girdling, and weaker-growing plants or fruiting mother branches should not be girdled.
2. When performing girdling, the knife edge should not be too wide, and it must be within 3 to 5 mm.
3. In order to prevent weakening of the tree vigor, the girdling technique cannot be applied year after year. It is recommended to divide the vineyard plants in half every other year or alternately every year.
4. After girdling the plants to set the fruit, increase the fertilizer and water appropriately, thin the fruit in an appropriate amount, control the yield, and avoid and prevent the weakening of the tree vigor.
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