How can grafting improve European red oak seedlings more effectively?

First, rootstocks and scions with strong affinity should be selected before grafting. Affinity refers to the ability of rootstock and scion to heal after grafting. In general, the stronger the affinity of the same species, the higher the grafting survival rate.

Second, select rootstocks and scions with strong vitality, which is related to the nutrients accumulated in the vegetative organs of rootstocks and scions. The more nutrients accumulated by vegetative organs, the stronger their vitality. Therefore, water and fertilizer management of rootstocks should be strengthened before grafting to accumulate more nutrients, and branches with mature buds should be selected as scions.

Third, choose the best grafting time. Grafting of branches should generally be carried out in early spring before germination of fruit trees, because rootstocks and scions are rich in tissue at this time, and temperature and humidity are also conducive to the vigorous division of cambium and accelerate wound healing. Bud grafting should be carried out in the slow growth period, and it is best to graft and survive and sprout into seedlings in the next spring.

Fourth, use plant hormones to promote healing. Before grafting, the scion is treated with plant hormones. Soaking in 200 ~ 300 ppm of NAA for 6 ~ 8 hours can promote the activity of cambium, thus promoting wound healing and improving the survival rate of grafting.

Five, standardize the technical operation of grafting, the action should be rapid, the rootstock and scion should be cut in strict accordance with the technology, the joint surface should be smooth, so that the cambium of rootstock and scion can be closely connected, and the binding should be moderately elastic and untied in time.