What about the size of the apple tree?

Sweet and sour apples, more meat, juicy, different varieties have different tastes, such as green apples are more sour and crisp, Red Fuji is more sweet. Recently, apple tree growers asked, what about the size of the apple tree? Let's take a look at the solution.

First, the reason for the size of the apple tree

The main reason for the size of apple fruit is the imbalance of nutrition and metabolism in the tree. The physiological differentiation period of flower buds was the same under different regional conditions, that is, the period of physiological differentiation was in the middle stage of physiological differentiation before the 5th week after the short branch stopped growing, and entered into morphological differentiation after 5 weeks. The physiological differentiation period of apple flower bud is just in the expansion period of apple, during this period, fruit trees need a lot of nutrients for fruit expansion. If there are too many fruits, the nutrients supplied by trees for flower bud differentiation will be reduced, resulting in inadequate flower bud differentiation. If there is too much fruit in the Lunar New year, a large amount of tree nutrients will be consumed, and if the tree nutrients are insufficient, the flower buds will be less, and the flowers and fruits in the second year will naturally be less.

Improper pruning makes the tree too exuberant and consumes a lot of nutrients. Insufficient application of fertilizer, poor breathing of soil hardening roots and poor ability of roots to absorb fertilizer and water will cause insufficient nutrition, affect the growth of fruit trees, and cause a large number of falling flowers and fruits. When the diseases and insect pests are serious, if the leaves are damaged, the fruit trees can not produce sufficient photosynthates for fruit growth, and if the roots are destroyed, the supply of water and mineral elements can not be guaranteed, resulting in a small year. The second is abnormal environmental conditions, such as freezing flower buds in adverse weather conditions, late frost in florescence, heavy snow, strong wind and fog, the pollination and fertilization of flowers can not be carried out normally, low temperature and strong wind in the young fruit stage causes a large number of shedding of young fruits, and the yield is greatly reduced in that year. If the flower bud differentiation period is too dry, leaf wilting is not conducive to flower formation, and serious hailstorms and waterlogging can cause big and small years.

Second, what about the size of the apple tree?

On the premise of ensuring the yield of the same year, the number of flowers and fruits should be properly controlled in order to save nutrition consumption, promote flower bud formation and lay the foundation for high yield in small years.

Small trees should try to retain flower buds, improve fruit setting rate, increase fruit, so that small years are not small.

In terms of fertilizer and water management, big-year trees should apply nitrogen fertilizer after flowering and mix with appropriate amount of phosphorus and potassium fertilizer when applying basal fertilizer.

Young trees chase available nitrogen before sprouting and a week after flowering, and spray 1% Mel 3% calcium superphosphate after flowering.

Winter irrigation and pre-sprout irrigation should be strengthened. The number of flower buds should be controlled, the fruit branches of young trees should be preserved, the vegetative branches should be truncated properly, and the weak trees and weak branches should be retracted and renewed.

Flower thinning and fruit thinning not only play an obvious role in overcoming the age, but also increase the number of fruits, improve the quality and prevent the premature senescence of the tree. In addition, artificial pollination and boron spraying at flowering stage should be strengthened to improve the fruit setting rate of young trees.