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苹果大小年结果，受多种内、外因素的影响，但结果过多而引起树体营养不足则是大小年结果的重要原因．苹果树体的生物学性状对树体营养状况有重要影响。所以，树体的生物学因素同样是影响大小年结果不可忽视的重要因素。影响苹果大小年结果常常与树冠过大、主干过高、冠高比小、骨干枝数目过多、角度不开张。骨干校长粗比过大过小、树势过强过弱、枝量过多或不足、枝组配置不当和叶枝比小、修剪量过大或过小、修剪方法不当以及枝果比小等生物学因素有密切关系。连午稳产高产树必须具备中型树冠、低干矮冠、树头扁圆、角度开张、树冠开张、骨干校数目少、枝组配置合理、树势稳健、枝量适宜、大年多留营养枝和对营养枝多行缓放或极轻短截以及保证适宜的枝果比和叶果比等生物学综合因素，缺少某些因素或某一重要因素，都会出现大小年结果。
Apple size year results, subject to a variety of internal and external factors, but the result is too much and cause tree malnutrition is the size of the annual results of an important reason. The biological characteristics of apple tree have important influence on the nutritional status of tree. Therefore, the biological factors of the tree are also important factors that can affect the results of size and year. Affect the size of the apple annual results are often too large with the crown, the trunk is too high, the crown is small, the number of backbone branches too much, the point is not open. Rough than the backbone principals than too small, too weak or too strong, too much or too weak branches, improperly arranged branches and branches than the small, too much or too little pruning, improper pruning and branches and other small organisms Learning factors are closely related. Even the mid-high yielding tree with mid-afternoon stable production must have medium-sized canopy, low dry short crown, oblate head, angle opening, the crown open, the number of backbone school less, branch group configuration reasonable, stable, suitable amount of branches, The multi-line nutrient branch of the release or very light short cut and ensure appropriate branch and fruit ratio and leaf ratio and other biological combination of factors, the lack of certain factors or an important factor, there will be size-year results.