Grafting propagation method of five-needle pine:

1. Grafting five-needle pine, generally use 3-year-old black pine seedlings as rootstocks, and select 2-year-old semi-lignified five-leaf pine row ends The branches (about 6 cm long) are used as scions in mid-to-late March.

2. When grafting, use a sharp grafting knife to make an oblique cut from top to bottom at a position 5-8 cm above the root neck of the black pine. The incision is about 2 cm long and 0.4-0.6 cm deep, and then Keep a few bunches of needles at the tip of the prepared five-needle pine scion, cut off the lower lateral needles, then cut the xylem on one side into a gentle slope equal to the length of the rootstock incision, and insert it against the rootstock incision. And align the cambium layers of the two. If you are not skilled in grafting, it will be difficult to make the width of the incision consistent with the width of the rootstock incision. At this time, you can align the cambium layer on one side and leave it alone on the other side, and you can still graft. .

Third, after grafting, use damp linen or plastic film to tie from bottom to top. It should not be too tight or too loose, and do not shift. After grafting, place it in a shaded place. When the scion heals, the branches stand straight and new leaves appear, it means the graft has been grafted. If the interface is tied with hemp leather, the hemp leather will naturally fall off as the interface heals and the passage of time; if plastic film is used as the binding tape, it must be removed in autumn and winter, otherwise it will affect the five needles. Normal growth of pine after grafting.

Fourth, to ensure the success of the grafted seedlings. After the grafting is successful in spring, cut off 1/3 of the upper branches of the black pine in autumn, cut off another 1/3 when they grow in the next spring, and then remove them all in winter. This can balance the nutrient supply relationship between the rootstock and scion and prevent Supply imbalance causes the scions to wither and die. However, if the scion grows vigorously, all the upper branches of the rootstock can be cut off in winter.