Reasonable summer shear timely control
After harvesting sweet cherries, the dense branches, thin branches, whip sticks and diseased branches should be removed or short-cut to open the light path, enrich the branches, reduce unnecessary consumption, and facilitate flower buds. Differentiation and maturity. Mainly for the upper strong trees, closed trees, should be carried out from top to bottom. For trees with excessive branches, the branches should not be in one step. It should be divided into two times, each time 1-2 big branches, the interval is 1 month; for the inner branches, the weak branches and the invalid branches should be disposable. In addition to; on the back of the tip of the tip to be removed once; for the prolonged shoots of the prosthetic to retain a prolonged tip, 1-2 re-extracted hearts, the remaining tips are all removed. The intuitive standard for reasonable leaf volume is that the ground light and shadow coefficient is 30%-40% when the sun is directly exposed to the canopy.
Twisting and twisting is the twisting of the long branches and competition branches that are strong in the semi-lignification, which weakens the growth, promotes the differentiation of flower buds, and transforms into the resulting branches. After twisting the hair, it is still more vigorous to continuously pick the heart and inhibit growth. Lightening the heart with the extension of the tip can alleviate the tree potential, but the uniaxial extension of the secondary shoot occurring after the topping is performed.
Topping the heart is to remove the young part of the apex before the new shoot has not been lignified, called topping. It is one of the most widely used methods for sweet cherry summer pruning. Topping the saplings can promote the germination of more branches and promote the formation of flower buds. For the first fruit and the fruiting period, the tree can be used to save nutrients, improve the fruit setting rate and fruit quality. Topping can be divided into mild topping, moderate topping, and severe topping.
Mild topping: only remove the top 5cm, after picking the heart, only one or two new shoots can be germinated and extended. Control the growth amount of 10 ~ 20cm, continuous mild topping, can form the result branches.
Moderate topping: The purpose is to promote multi-branch, when the new shoot grows above 40cm, remove more than 15cm, usually 3-4 branches can be germinated.
Severe topping: When the branches develop to more than 40cm, leaving the heart about 15cm, not only can promote branching, but also the lower buds can grow into short branches or leaf branches, forming a small result branch group. The length of the topping branches should be determined according to the different uses of the branches and the branches. As a backbone branch, the branch is longer and should be above 40cm.
When the new shoot grows longer, and the branch is shorter, and the topped part is semi-lignified, it needs to be trimmed with scissors. The effect of cutting the tip is stronger than the topping.
Pulling branches will pull strong branches to places with space to make up for the lack of backbone branches. It can accelerate the formation, delay the growth of shoots, improve the illumination of the inner church, and promote the differentiation of flower buds. In the vertical direction, each main branch should be kept at 80-90; the overlapping branches can be horizontally pulled to the appropriate direction; the spacing between the main branches in the same direction should be 80-100 cm.
Timely control When the tree is still unable to inhibit growth after adopting various summer shearing measures, it is necessary to spray 200-300 times of paclobutrazol or 180-200 times of PBO in time, according to the principle of only half a month, only spraying the tip, generally Wangshu sprayed 2-3 times to receive better inhibition.
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