The apple tree grows in the later stage, and the nutrient consumption of the tree body is exhausted after harvest. The fruit farmers vividly call the apple tree at this time the "confinement" period. This period is not only the period of flower bud differentiation, but also the peak of root growth. During the period, the nutrient of the tree is transferred from the nutrient delivery to the fruit before harvest to the accumulation of the tree itself, which requires a lot of nutrients. Fruit growers apply "month fertilizer" to apple trees by furrowing and spraying foliar fertilizer. The role of "month-old fertilizer" is obvious: First, it can increase the accumulation of nutrients in the tree, promote the health of the tree and the next year's flowering and fruit setting; the second is to improve the root growth environment and improve the tree's resistance to stress; the third is to shorten the nutrition of the fruit tree. In the transition period, it enters the physiological differentiation period of flower buds as early as possible, and reserves sufficient nutrients.
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