Relationship between Water spraying at flowering stage and High Fruit setting rate of Jujube

Jujube pollen germination needs higher air temperature, especially jujube varieties, when the air relative humidity is less than 60 to 70%, the pollen germination rate will be significantly reduced. Spraying water at flowering stage plays an obvious role in improving the fruit setting rate of jujube. The time of spraying water is the best in the evening and the worst in the morning and afternoon. The temperature is low in the evening, the water evaporates slowly, the high temperature in the crown is maintained for a long time after spraying water, and the pollen has dispersed in the evening, so it will not be washed away by water. At noon and afternoon, the temperature is high, the temperature is low, and the clear water sprayed on the leaves and flowers evaporates quickly to maintain high temperature for a short time, with little effect, and contains to wash away part of the pollen at the same time.