果树的产量往往一年高,一年低,当两年产量之差达到30％以上时,称为“大小年”。苹果树的大小年现象比较严重。大小年常在一个地区有它的一致性,但有时也并非完全如此,在大年,有小年的植株,在小年也有大年的植株,甚至在同一树上的不同枝条,不同方位也会出现此种情况。大小年对果实的产量、品质、果树的抗逆性和市场的供应以及劳力的安排诸方面均带来不良的影响:一般说大小年树的平均产量低于稳产树;结果多的大年树,往往果实 The output of fruit trees is often one year high, one year low, when the difference between two years of production reached 30% or more, known as the “size year.” Apple tree size year more serious phenomenon. The size of an annual in a region has its consistency, but sometimes not entirely so, in the New Year, there are small plants, small plants in New Year, and even different branches of the same tree, different directions also This happens. Year of the year on the yield of fruit, quality, resistance of fruit trees and market supply and labor arrangements in all aspects of the adverse effects: Generally speaking, the annual output of large and medium-sized trees is lower than the stable yield of trees; , Often fruit