The size of fruit heads depends mainly on two aspects:
The number of fruit cells is pear. For example, a pome fruit consists of 25 to 40 million cells, with 35 to 40 million cells for large fruits and 25 million cells for small fruits. The critical period for the increase in the number of cells is about one month after flowering. During this period and before flowering, the number of cells is small. The number of cells also depends on the nutrient stored in the fall of last year and the nutritional status from the beginning of March to the end of May.
The size of the fruit cells determines whether the fruit cells increase or not. There are two main factors:
The first is the long-term nutrition status of the fruit. During this period, malnutrition directly affects the size of fruit cells.
The second is the content of endogenous gibberellins and exogenous gibberellins. The endogenous gibberellins are mainly secreted by the seeds in the fruits. Pollinating and poorly-fertilized fruits result in a small number of seeds in the fruits and an endogenous gibberellin content. Also less; exogenous gibberellin mainly by artificial external application, such as smearing swelling agent.
The factors affecting the size of the fruit include the strength of the tree potential, the supply of fertilizer and water, and the load. Poor pollination, poor fertilization, weak tree vigor, lack of fertilizer and water, and excessive load are the main reasons for the current small fruit size. On the basis of ensuring the quality of flower buds and the quality of pollination and fertilization, we should also pay attention to thinning and fruit thinning to ensure that the number of large fruits increases.
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