What are the phenological characteristics of fruit trees?

With the change of climatic conditions in four seasons, fruit trees show a series of changes in external morphology and internal physiological rhythm, such as germination, rooting, flowering, long branches, fruit development, defoliation and dormancy. This process of life activity is called bioclimatic period, or phenological period for short.

The phenological characteristics of fruit trees are formed by each fruit tree under certain environmental conditions for a long time, which is the reflection of variety characteristics adapting to cultivation environmental conditions. Each phenological period has a certain order. But the phenological order of different tree species and varieties is different.

All phenological changes are the result of some external conditions. The adaptability of fruit trees to the changes of external conditions is first manifested in the changes of physiological functions, which leads to the variation of characters consistent with their phenology and makes their morphology and anatomy have corresponding characteristics. Therefore, the normal progress of phenology needs not only the necessary comprehensive external environment, but also the necessary material basis. It can be expressed as quantitative change or qualitative change. Therefore, only by correctly understanding and mastering the dynamic changes of nutrients in different phenological periods can we formulate and implement effective measures for rational fertilization and provide material basis for high yield and high quality.