First, the reason why apple trees produce years of age 1. Nutrition competition Nutritional competition is the root cause of the “years and yearsâ€. In the big year, apples have a large amount of flowers and many fruits. The flowering results consume a lot of nutrients, causing the nutrients of other organs, especially the top buds of the branches, to be greatly reduced. As a result, the flower buds cannot be formed due to insufficient nutrition, so they are small years after the new year. On the contrary, there are fewer flowers and fruit in the small year, and the accumulation of nutrients in the tree increases, which creates favorable conditions for flower bud differentiation. The annual output is greatly increased, which is the new year. 2. The influence of plant endogenous hormones The formation of flower buds in the New Year is less, and in addition to insufficient nutrient accumulation, it is also related to the inhibition of flower bud differentiation by gibberellin produced in fruit seeds. As a result of the large number of multi-subjects, the seeds produced a large amount of gibberellin, which promoted the growth of new shoots, thereby inhibiting the formation of flower buds and turning the next year into a small year. 3. Other reasons In addition to the above two main reasons, the harsh natural environment and unreasonable cultivation management will also cause years of age. Such as flowering, flower bud differentiation period, excessive rain, fruit set drought, and a large number of falling flowers and fruit due to late frost will cause years of age. Second, the apple tree to overcome the measures of size 1. Strengthen fertilizer and water management In the pre-flowering and fruit expansion period, timely supplement various nutrients, promote the growth of branches and leaves to produce more photosynthetic products, ensure the nutrients needed for fruit growth, prevent excessive nutrient consumption of the tree and become a small year in the coming year. After the fruit is harvested, the fruit fertilizer is applied early and before the deciduous leaves, and the functional compound fertilizer + bio-organic fertilizer is applied to each tree along the canopy to promote the flower bud differentiation and the second year flowering result. 2, reasonable pruning Maintaining a normal leaf-to-fruit ratio through reasonable pruning, the nutrient accumulation and fruit consumption of the tree are relatively balanced, thereby reducing the size of the year. The specific method is: heavy cut in the big year, small young cut. A. Under the premise of guaranteeing the current year's output, the amount of flower buds should be properly controlled, and the short and short branches of the fruit and the short branches should be kept, and the reserve branches should be reserved. B. Retract the perennial branches, properly shrink the branches and branches; handle the dense branches and improve the illumination. , to improve the quality of flower buds; C, small young shears, is less sparse branches, less short cuts, do not carry out large adjustments and updates of the tree structure, try to retain the amount of flowers, and then re-cut according to the specific situation Or adjustment of retraction; D, can also combine measures such as pulling branches and ring cutting to promote flower bud differentiation and reduce the phenomenon of large and small years. 3, pay attention to sparse flowers and thin fruit Thinning and thinning can reduce the load of the tree, adjust the ratio of leaf to fruit, increase the accumulation of nutrients. To overcome the size of the year, the early elimination of weak flowers and useless flowers can effectively reduce nutrient consumption and promote flower bud differentiation. 4. Chemical regulation The use of 6-benzylaminopurine + chlormequat can inhibit the synthesis of gibberellic acid in plants, reduce the apical dominance, inhibit cell elongation, control the growth of plants, promote the lignification of branches, accelerate the ripening, and make the aerial parts There is enough nutrients to transport to the site of action, which is conducive to flower bud differentiation. Specific use method: Before the spring shoots stop (in the middle and late May), use 6-benzylaminopurine + chlormequat to spray the whole plant, focusing on spraying new shoots; according to the tree potential, after bagging (mid-June) And spray the 1-2 times in the early stage of the growth of the autumn shoots (mid-July). Disclaimer: Some articles on this website are transferred from the Internet. 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