A: Gibberellin is a ubiquitous endogenous hormone in plants. At present, more than 70 kinds of gibberellins have been found in plants. Their main functions are to promote cell growth and elongation, change the ratio of female flowers to male flowers, induce parthenocarpy and promote fruit setting. Gibberellin produced by artificial Gibberella is mainly gibberellin 3(GA3), which is also the most widely used in production. 1958, produced by China Academy of Sciences and Beijing Agricultural University, is called gibberellic acid, "920". Generally, gibberellin (920) is used after jujube trees open, and the concentration is 10 ~ 20mg/kg, and some varieties need to be increased to 40 ~ 70mg/kg. Gibberellin is an endogenous hormone and must be used under the conditions of good fertilizer and water management and strong trees. In order to give full play to the yield-increasing effect of gibberellin and improve the fruit quality, the author sprayed flowers with gibberellin mixed with 50% chlormequat chloride 3000 times solution, 0.2% urea, 0.2% potassium dihydrogen phosphate and 0. 1% ~ 0.2% borax solution, which was better than using gibberellin alone. Vegetative growth is inhibited, and nutrient distribution tends to reproductive growth, so the weight of single fruit increases. Readers can carry out a small number of experiments according to local conditions, and then popularize and apply them on a large scale after success).

The investigation found that in the flowering management of winter jujube, some growers unilaterally pursued yield and improperly used measures to improve fruit setting. If some jujube farmers spray gibberellin 3-4 times at the flowering stage of jujube trees, the yield will increase, the fruit quality will decrease, the peel will thicken, the sugar content will decrease, and the original flavor of jujube skin will be lost, which should be highly valued. The cultivation measures we should take should focus on improving fruit quality, and keep the yield at a reasonable high-yield level on the premise of ensuring fruit quality. All commodities (including fruits) only win the market with excellent quality, get the favor of consumers and benefit producers and operators, otherwise they will be eliminated by the market.