Grafting Propagation of Cornus officinalis

Cornus officinalis is intraspecific grafting with close genetic relationship and strong affinity. After years of experiments, the survival rate of Cornus officinalis grafting by split grafting is very high, the technique is simple and easy to master. This method is mainly used for the renewal of Cornus officinalis.

(1) Collection and treatment of scions

The mother plant used as scion must be a high-quality fruit type with large fruit, high peeling rate and strong stress resistance. The annual developing branches outside the crown are used to keep them fresh after harvest to prevent water loss. Before grafting, cut the scion into 10 cm segments of 1-2 pairs of buds, pay attention to picking as you like.

(2) splitting method

In mid-late March, when the spring shoot germinates, the scion is first flattened on both sides 4-5 cm from the lower end to make the scion wedge-shaped, then cut off the rootstock 5-10 cm from the ground, once cut flat, split the rootstock from the middle with branch shears at the cut, insert the scion, align from top to bottom, and the scion wound reveals the interface 0. 5 cm, wrap the wound tightly with a plastic strip.

(3) after-service management

1. Check the survival and replacement.

The grafted scion can be checked for survival after about half a month. If the scion leaf bud unfolds, it is the grafting survival; if the scion leaf bud is dry and wrinkled, it will fall off with a slight touch of the hand, that is, the grafting will not survive. For rootstocks and scions that have not been grafted, if one grafting fails to survive, supplementary grafting can be carried out if time permits.

two。 Release the binding in time

Generally, about 20 days after grafting, the scion and rootstock can be completely healed. After successful grafting, the growth and development of the scion is very exuberant, so it is necessary to release the binding in time to prevent the binding around the cortex of the rootstock, injuring the buds and affecting the survival.

3. Sprout

After grafting, a lot of buds often appear in the lower part of the rootstock, if not removed, it will affect the healing between the rootstock and the scion and the growth and development of the scion. In order to concentrate the nutrients of the tree to supply the growth and development of scion buds, the buds on the rootstock should be erased in time.

4. Strengthen the management of water and fertilizer

After the grafting survived, the management of water and fertilizer should be strengthened, the weeds should be ploughed and weeded in time, and 1000 kg of mature farm manure should be applied per mu during the overwintering period to ensure the nutrient needs of grafted seedlings.

(4) seedlings coming out of the nursery

In the second year after grafting, spring shoots can come out of the nursery and transplant before germination.