Characteristics of growth and development of jujube fruit

After flowering and fertilization, the ovule forms the seed, ovary and disk to develop into fruit, which is also called drupe because of its hard core. It can be divided into four stages: the slow growth period of ⑴, which starts from the expansion of ovary and is completed in about 15 days, and there is no large number of flowers and fruits in this period; the period of rapid growth of ⑵ lasts from 2 to 4 weeks, and the fruit grows rapidly; the slow growth period of ⑶ is 4 to 7 weeks, the nuclear growth slows down, the pulp grows slowly, while the weight increases sharply, and nutrients accumulate rapidly. The growth period of ⑷ before ripening was about 3 weeks, which was mainly due to the accumulation and transformation of matter, the color of pericarp turned light and gradually colored, the pulp became crisp and the flavor improved.