1. Select male scions that have late flowering
After the mature male flower of Ginkgo biloba matures, the pollen sacs released a large amount of pale yellow pollen. At this time, the flowering period is called (Yang) flowering period. Generally, the flowering peak period is only about two days. When the ovule of mature female flower grows and matures, the bead hole exudes from the powdery liquid and forms beads, that is, “ "Sexual water" is flowering at this time, and flowering lasts for about 1 week. The pollen of the male flower floats on “sexual water†and the female flower can be fertilized. Male trees usually bloom early and have low flowering encounter with female trees. Natural pollination rate is not high. Therefore, flowering should be delayed. Male branches that flower at the same time as females are grafted for scion.
2. Select the male scion that has a large amount of flowers
According to the survey, some male trees - one axillary bud (referring to the axillary bud containing male flowers, the same below) have 1-3 male flowers, and some male trees have one axillary bud with 5-9 male flowers. To select the male shoots with male buds to do scion.
3. Select the male scion that takes longer to blossom
The flowering season of male flowers is generally only about two days. Some male trees have a longer flowering period and the flowering period can reach more than 4 days. Scion selection must be performed on male trees that have a longer flowering period.
4. Choose two male scions that have different flowering stages and little difference
In order to avoid affecting the normal pollination caused by continuous malevolence caused by continuous rain during the flowering period, two male scions with different flowering stages and little difference should be selected when grafting male branches on the mother tree. It is best to have a male branch (scion) at the peak of flowering 2-3 days earlier than the peak of flowering of the female tree. Another peak of the male branch (scion) is 1 day later than the peak of flowering of the female tree to ensure the fertilization of female ginkgo flowers. .
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