Apple thinning and fruit thinning is a key technical link to achieve high quality and high yield. Scientific and reasonable load can significantly improve the product rate of fruits, reduce the size of the annual results, and ensure the healthy growth of the tree.

The role of fruit thinning

1. Improve the quality and yield of fruit. If too much young fruit is removed, nutrition can be saved and concentrated, so as to increase the color, fruit, sugar content and the like of the remaining fruits, especially for increasing fruit.

2. Promote flower bud differentiation and increase the number and quality of flower buds. The formation of flower buds must have a certain amount of nutrients to complete. By removing the fruits of overloading, it will reduce the consumption of nutrients and allow the accumulated nutrients to lay a material foundation for the formation of flower buds that are sufficiently plump.

3. Promote strong tree vigor and extend the economic life of the tree. By increasing the tree vigor through fruit thinning, you can also prevent frost damage and frost.

A reasonable amount of fruit

To determine the reasonable amount of fruit in the apple tree, comprehensive consideration shall be given based on the variety, age, vigor, cultivation and management technology, and the annual output and quality.

1. Determine the amount of fruit left according to the yield. In order to ensure the production of high-quality fruit, trees with fruitage deadlines are suitable under the general management level with an output of 2,000 to 2,500 kilograms per mu.

2. Leave fruits according to the distance between the fruits. Keeping fruits according to the distance is a simple and easy method commonly used in production at present. The medium and small fruit (Gula, Red Star), the fruit spacing is maintained at 15 to 20 cm, and the fruit spacing of the large fruit (Red Fuji) remains at 20 ~ 25 cm.

3. Determine the amount of fruit contained according to the trunk roughness. The trunk length (cm) of the trunk (20 cm from the ground) was measured, and the amount of fruit left per plant was calculated according to the formula = 0.25 dry weeks. According to the cross-sectional area of ​​the trunk (TCR) in foreign countries, the amount of fruit per plant = TCR5 was determined. In addition, according to the ratio of branches and leaves, leaves and fruit to stay in the law.

4. According to the management level of the orchard and the age and trend of the tree, adjust the fruit-retention index. High management level, small age, strong tree vigor, can stay adequate. The old and weak trees should be based on the premise of increasing the growth of the tree, with as little fruits as possible, and even without fruit.

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