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First, the main reason for jujube tree falling flowers and fruit is that the jujube tree falls and flowers have the following three reasons: (1) the flowering period of jujube trees is generally from May to June. At this time, it is the rapid growth and new roots of jujube shoots. During the period of rapid growth, there is a problem of competition between nutrients and reproductive growth on nutrients. Therefore, if the amount of nutrients supplied to the flowers is insufficient, the bracts are incompletely carried out, pollination and fertilization are poor, and within 1 week after flowering, all of these flowers fall off. . (2) During the flowering period of jujube trees, if there is a long-term dry weather, there will be a phenomenon that the pollen tube does not germinate and the pollen does not spread, so that the amount of flowers that complete pollination is reduced, and the flowers without pollination fall off. (3) When jujube trees bloom, if it rains for a long time, it will cause the pollen to flow poorly, the number of insects will decrease, and the result of poor pollination will also cause a large number of unfinished pollination flowers to fall off.
Second, the main technical measures to prevent jujube falling flowers and fruit (1) ring stripping during the flowering period. The specific implementation of the ring stripping technology depends on the age of the tree and the tree potential. For the jujube trees of 3 to 5 years old, the main branch stripping method is generally adopted, while for the jujube trees of 5 years old or older, the main ring stripping method is adopted. The width of the ring stripping varies depending on the growth potential of the tree (the thickness of the main branch or the trunk), and is generally 0.5 to 1.0 cm. (2) New shoots (jujube head) topping. On the basis of maintaining a certain number of new shoots (jujube head), a part of the new shoots (jujube head) is appropriately removed, and when the new shoots (jujube head) have 4 to 5 secondary branches, the new shoots are taken. ) Topping, retaining 3 to 4 secondary branches. (3) Spraying growth regulators such as gibberellin and paclobutrazol during flowering. (4) Strengthen the management of fertilizer and water. Although jujube trees are resistant to inferiority, rational fertilization and watering before flowering is an important measure to enhance tree potential, increase yield, and achieve high yield and stable yield. Apply base fertilizer before flowering, add nitrogen fertilizer, add phosphorus fertilizer and potassium fertilizer after flowering, need timely irrigation when drought, in order to facilitate pollination and fertilization, and improve fruit set rate. (5) Put the bee in the jujube garden. If the bee is placed in the jujube garden, the jujube fruit rate can be significantly improved. (6) Mixed varieties. Planting 2~3 jujube varieties at the same time in the jujube garden, so that the varieties can pollinate each other and increase the fertilization rate and fruit set rate; but for some special fine fresh jujube varieties, in order to improve the fruit setting rate, they need to be configured. A pollination variety with strong affinity that is compatible with this variety.
Second, the main technical measures to prevent jujube falling flowers and fruit (1) ring stripping during the flowering period. The specific implementation of the ring stripping technology depends on the age of the tree and the tree potential. For the jujube trees of 3 to 5 years old, the main branch stripping method is generally adopted, while for the jujube trees of 5 years old or older, the main ring stripping method is adopted. The width of the ring stripping varies depending on the growth potential of the tree (the thickness of the main branch or the trunk), and is generally 0.5 to 1.0 cm. (2) New shoots (jujube head) topping. On the basis of maintaining a certain number of new shoots (jujube head), a part of the new shoots (jujube head) is appropriately removed, and when the new shoots (jujube head) have 4 to 5 secondary branches, the new shoots are taken. ) Topping, retaining 3 to 4 secondary branches. (3) Spraying growth regulators such as gibberellin and paclobutrazol during flowering. (4) Strengthen the management of fertilizer and water. Although jujube trees are resistant to inferiority, rational fertilization and watering before flowering is an important measure to enhance tree potential, increase yield, and achieve high yield and stable yield. Apply base fertilizer before flowering, add nitrogen fertilizer, add phosphorus fertilizer and potassium fertilizer after flowering, need timely irrigation when drought, in order to facilitate pollination and fertilization, and improve fruit set rate. (5) Put the bee in the jujube garden. If the bee is placed in the jujube garden, the jujube fruit rate can be significantly improved. (6) Mixed varieties. Planting 2~3 jujube varieties at the same time in the jujube garden, so that the varieties can pollinate each other and increase the fertilization rate and fruit set rate; but for some special fine fresh jujube varieties, in order to improve the fruit setting rate, they need to be configured. A pollination variety with strong affinity that is compatible with this variety.
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