What are the characteristics of the growth and development of jujube fruit?

After the jujube fruit is pollinated following flowering, the ovule forms the seed, and the ovary and the flower disc develop into the fruit. Because it has a hard stone, the jujube is also called a drupe-like fruit. It can be divided into four stages: (1) the slow growth phase, which begins with the swelling of the ovary and is completed in about 15 days; during this phase, there is no large-scale flower and fruit drop; (2) the rapid growth phase, lasting 2 to 4 weeks, during which the fruit grows rapidly; (3) the slow growth phase, lasting 4 to 7 weeks, during which the stone grows more slowly, the flesh grows slowly, but the weight surges and nutrients accumulate rapidly; (4) the pre-ripening growth phase, about 3 weeks, which is mainly the accumulation and transformation of substances; the peel color turns pale and gradually becomes colored, the flesh becomes crisp, and the flavor improves.