Generally, black olive trees can be girdled after the autumn shoots mature in late June (65438+1 October), and 300mg/kg paclobutrazol1time can be sprayed in mid-June of the following year (kloc-0/65438+1October), and fertilizer and water management and pest control should be strengthened. A barren tree may be a male tree with only male flowers and can only be replanted by high grafting.

Olive plants are tall, with deep roots and luxuriant leaves, and grow vigorously. It is difficult to stop growing and differentiate flower buds in winter, so the flowers are poor. The following technical measures must be taken in time to control its growth, so that it can differentiate flower buds normally and improve the flower formation rate.

Techniques of forcing flowers of olive in winter

First, it is deeply rooted. In winter, the topsoil under the crown of olive is deeply ploughed by 30-40 cm, and some absorption roots are cut off to control the absorption of water, nitrogen fertilizer and auxin by roots, inhibit plant growth, increase juice concentration and promote flower bud differentiation.

Second, sprinkle lime. After deep ploughing and root cutting, apply 3-4kg of hydrated lime powder to each olive tree and spread it evenly on loose topsoil, so as to supplement calcium, enrich fruiting branches, increase nutrient accumulation and improve nutrient level, which is beneficial to flower bud differentiation.

Third, cut down trees. In winter, cut the trunk of olive from the ground to the height of 1- 1.5 meters with a sharp knife, and cut it evenly from left to right and from front to back. The wound spacing is 8- 10 cm, reaching the xylem without hurting it, so as to weaken the growth potential and inhibit the growth.

Fourth, ring cutting and binding. For plants with particularly vigorous growth, especially trees that have just been put into production, cut 2-3 circles on the thick branches with a sharp knife, with a thickness of 4-5 cm, and the interval between each circle is 3-5 cm, and reach the xylem without hurting the xylem, or use iron wire No. 16 Tie it 2-3 times, with a spacing of 5-6 cm, and the wire should be slightly immersed in the skin. This can obviously inhibit the growth potential and make the flower buds differentiate normally. However, if the wire is tied around, it should be lifted after the temperature rises in spring to avoid excessive suppression.

Fifth, spray medicine. In winter, when the bearing branches of olive trees turn green and mature, the leaves are dark green, the terminal buds are full, and the winter buds are about to sprout, 1000 times of ethephon water solution, 1000 times of chlormequat chloride water solution, 1000 times of chlormequat chloride water solution, 750 times of paclobutrazol water solution or 750 times of paclobutrazol water solution are sprayed on the crown of olive trees.