Seedling raising technique of Robinia pseudoacacia

Black locust (RobiniahisPida). Safflower Robinia pseudoacacia, also known as Robinia pseudoacacia, is a small deciduous tree or tree of the genus Robinia pseudoacacia in Leguminosae, branchlets, pedicels and petioles densely covered with brown fine prickles, famous for its beautiful shape and colorful flowers, its rose red or lavender flowers, pods 5m long, with glandular bristles, florescence May-July, is a rookie of garden trees, usually using Robinia pseudoacacia as rootstock for grafting propagation.

Native to America, it is cultivated and propagated in Beijing, Hebei, Shandong, Henan and Liaoning. It is an excellent ornamental tree species for courtyard and street greening.

Seedling raising technique: the large seedlings of Robinia pseudoacacia are usually used as rootstocks for grafting propagation. Generally sowing seedlings of Robinia pseudoacacia, selecting excellent and robust seedlings, transplanting and cultivating for 4-5 years, through root cultivation, cultivation, increasing row spacing, timely irrigation, fertilization, soil weeding and forbidden erasing and repairing techniques to strengthen seedling tending management, cultivate a straight, smooth and sturdy tree with a height of more than 3.5 meters, a breast diameter of more than 5 centimeters, and a grafting site with a diameter of more than 3 centimeters. Choose as grafting rootstock.

Select the scion for collection and grafting, first cut off the tip and the unfull part of the buds at the base of the scion, and cut the branch of the scion into a scion with 10 Mel 12 cm long with 2 Mel 3 buds. Then cut into a wedge-shaped slope of 2mi 3cm long on both sides of the lower end of the bud 3 cm below the scion. The rootstock is thicker than the scion, and the lower end of the scion is cut into a flat wedge, so that one side with the terminal bud is thicker and the other side is thinner, which is beneficial to the clamping of the rootstock and the tight combination of the interface. The scion surface should be smooth and smooth, so that the cutting surface is easy to be close to the split of the rootstock, and the cambium on both sides is easy to heal. After cutting the scion, pay attention to moisturizing and prevent water evaporation and soil.

The rootstock of Robinia pseudoacacia can be cut or sawed from a height of 3 meters above the ground, and the cut is cut into a smooth plane to facilitate healing. Use a splicing knife to gently split two cleavages perpendicular to each other from the center of the cutting section of the rootstock, and the split is about 3 cm long.

After the rootstock is split, gently pry open the split with a splitter, and quickly insert the cut scion so that each scion and the rootstock form a layer to align. The rootstock is thicker and inserts four scions equidistant from each other to form a symmetrical and plump round crown after survival, which avoids partial crown and improves the survival rate of grafting.

When grafted. When cutting the scion, the cutting surface should be exposed 0.l-0.2 cm, so that the cambium contact surface between the scion and the rootstock is larger, which is beneficial to the formation and healing of the meristem.

Immediately after joining, tie it with a plastic film strip to prevent the scion and the rootstock cambium from staggering. Above it is covered with a plastic bag and wrapped well, which is conducive to moisturizing and warming the interface, is conducive to the healing of the interface, prevents ventilation and water loss, and effectively improves the survival rate of grafting.

About 6 weeks after grafting, the healing survival can be checked. Generally, the plastic band can be unbound in time after graft healing, so as not to affect the growth and development of the rootstock junction.

After branch grafting, the buds of robust growth were retained after the scion germinated, making it form a symmetrical and plump crown. All the sprouts on the rootstock are erased to ensure the growth and development of grafting and to control the ineffective consumption of nutrients and water. In order to promote the rapid growth and development of high grafted scions.

Finally, in order to make the grafted seedlings grow healthily and develop well, according to the soil fertility of the nursery and the growth needs of grafted seedlings, timely appropriate amount of irrigation and topdressing, regular ploughing, loosening soil and weeding, so as to prevent the occurrence of diseases and insect pests in the seedling stage. Strengthen the tending and management of grafted seedlings and cultivate high-quality strong seedlings that meet the requirements.