Detailed Explanation of the Role of Hormones in Preserving Flowers and Fruits of Jujube Trees

For jujube trees, spraying 5 parts per million of gibberellin at the early stage of full bloom, that is, when 5 to 8 flowers have opened on the fruiting branches, can significantly increase the fruit-setting rate. To improve the effectiveness of gibberellin, adhesives such as laundry detergent can be added, and it can be applied together with a 0.3 to 0.5% urea solution.
In addition, spraying 10 parts per million of 2,4-D during the young fruit stage can reduce fruit drop. However, when the concentration of 2,4-D exceeds 80 parts per million, it will cause phytotoxicity, and in severe cases lead to leaf drop and fruit drop.