The size of a fruit tree depends mainly on two aspects:
The number of fruit cells is exemplified by pears. One pear consists of 25 to 40 million cells, 35 to 40 million cells in large fruit, and only 25 million cells in small fruit. The critical period of increased cell number is about one month after flowering. In this period and before flowering, the number of cells is small. The number of cells also depends on the nutrients stored in the autumn of last year and the nutritional status from the beginning of March to the end of May.
The factors affecting the size of the fruit are the strength of the tree, the supply of fertilizer and water, and the load. Pollination, poor fertilization, coupled with weak trees, insufficient fertilizer and excess load, are the main reasons for the current small fruit. On the basis of ensuring the quality of flower buds and the quality of pollination and fertilization, we should also pay attention to the thinning and fruit thinning to ensure the increase of the number of large fruits.
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