Pruning apple trees in winter should follow four principles, namely: stick to one center, solve two problems, adjust three balances, and adopt four methods.
Stick to one center
Around the center of early fruit, high quality and stable yield.
Solve two problems
1. Operational problems: Canopy between rows, too low main branches, too tall trees, and too long branches affect management operations. In response to these problems, the transformation goals should be established, the work channel should be opened to keep it at 1.0~1.2 meters, and the trunk should be gradually raised so that the height of the trunk should be at least 60 cm and the height of the tree should be controlled below 3.5 meters. Where the row spacing is less than 5 meters, the appropriate tree height is 2.8~3.2 meters.
2. Poor ventilation and light transmission: too many branches in the upper part, too thick branches in the middle part, and too many main branches in the lower layer, which affect the light. After pruning, the number of main branches distributed on the free spindle-shaped main trunk is kept at about 10, and the spacing between overlapping main branches should be more than 70 cm. The distance between medium fruiting branch groups on the lower main branch is about 40 cm, and the spacing of small fruiting branch groups is about 20 cm. .
The slender spindle-shaped tree leaves about 17 uniaxially extending small branch groups. The spindle-shaped tree generally does not have main branches or large lateral branches. The small crown has a heart-shaped structure with a main trunk height of 1.0 to 1.5 meters. There are 4 non-overlapping main branches on the middle stem, with a vertical angle of 60-80 degrees; the main branches are equipped with a reasonable combination of large, medium and small, and the high, medium and low are scattered and orderly loose and slender. . The height of the tree is 2.5~3.0 meters. The canopy is single-layered, semicircular or oblate in the shape of an umbrella or butterfly, and the crown is about 2.0 meters thick.
Adjust the three balances
1. Up and down balance: It is necessary to control the strength of the upper and the lower, but also prevent the weak from the upper and lower, so that the individual maintains a moderate and healthy growth and development condition.
2. Internal and external balance: prevent large-scale branches from being strong and internally weak, resulting in moving out; control the branches on the inner chamber back to stand upright and long and form a bald zone at the back; large and medium-sized branches should also maintain a balance of front and back growth; small results The branch group should be properly retracted in time to raise the angle.
3. Balance between vegetative growth and reproductive growth: increase the amount of pruning and reduce the amount of flowers in the new year; try to lighten the block and shrink as much as possible in the young year, and keep the flower buds and branches. Generally, after pruning of stable yield trees, medium and short branches should account for about 80%, long branches account for about 20%, and flower bud branches account for 30% of the total.
Use four methods
1. Thinning: one is to thin the upright and long branches on the back, avoid leaving prongs to prevent from taking extra long branches; the second is to thin out the branch group that results in too dense, choose the best and keep the distance more than 20 cm; third is the front part of the branch group Excessive annual branches should be thinned out to keep the branch group extending uniaxially; the fourth is to thin out large branches that are not properly positioned.
2. Retraction: If the growth potential is too strong, it should be slightly retracted or not; if the growth potential is weak and occupy too much space, it can be retracted appropriately. For the more upright branches with strong apex, it should be used first. Pull branches to promote flowers, and then retract after the results.
3. Short cut: mainly used in young trees and weak trees.
4. Slow release: For the one-year-old or perennial branches to be flattened or twisted and turned back, in spring, multi-channel circumcision or the method of suppressing the top and promoting germination is used to promote the formation of flowers. Red Fuji is more suitable for slow release.
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Monobenzone can decompose melanin in the skin, and prevent the formation of melanin in the skin, used for the treatment of hyperpigmentation, such as various spots, age spots, melanoma. In addition as intermediates in organic synthesis.
Our company offers variety of products which can meet your multifarious demands.including API Powder.Pharmaceutical Intermediates.Vitamins Powder.Plant Extracts.Food Additive.Peptide Powder and so on We adhere to the management principles of "quality first, customer first and credit-based" since the establishment of the company and always do our best to satisfy potential needs of our customers. Our company is sincerely willing to cooperate with enterprises from all over the world in order to realize a win-win situation since the trend of economic globalization has developed with anirresistible force.
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