Management of walnut seedlings after grafting

   grafted from May and June to October grafted seedlings out of the nursery, only a few months, in order to ensure the healthy growth of grafted seedlings and cultivate high-grade seedlings, it is necessary to strengthen management.

   1. Check whether the walnut buds survived or not after 1 week of bud grafting. Fresh and full buds indicate that the grafted walnut buds did not survive, and the buds blackened did not survive. It usually takes about 15 days for branch grafting to germinate.

   2. When shearing rootstock buds are grafted in May, the rootstocks above the grafting interface should be kept at the same time with 1 to 2 compound leaves cut off to inhibit the growth of rootstocks and facilitate the survival of buds. Cut the anvil at 1.5-2cm on the grafted bud 7-10 days after grafting to promote the growth of the grafted bud. On the other hand, the seedlings grafted after the middle of July did not cut the rootstock, but they were only cultivated into semi-finished seedlings with a variety of buds in that year, and the rootstocks were not cut until the next spring, and the buds germinated and grew into grafted seedlings.

   3. About 20 days after budding, a large number of shoots will sprout on the rootstock, which should be wiped out in time to concentrate nutrients for budding and growth. In the future management process, we will also concentrate on wiping the buds for 1 or 2 times. Generally, when the new tip of the grafting bud grows to more than 30 cm, the rootstock buds rarely sprout again.

   4, after unbinding bud grafting, pay attention to check the petiole of the scion, there is a need to break the film to prevent the whole bud from rotting. The graft grows rapidly after the graft survives, and the binding can be lifted in time when the new tip grows to more than 3 cm. The interface unbound prematurely is not firmly healed, and the scion is easy to be blown off by the wind or knocked off due to field operation. Unbinding too late plastic sheeting will inhibit the thickening of the binding site and form inheritance marks, and the seedlings will be easily broken by the wind in the future.

   5. Fertilizer and water management Walnut can not be watered and fertilized after grafting to before budding. When the new shoot grows to more than 10 cm, it begins to strengthen fertilizer and water management and promote growth. Topdressing and watering are carried out at the same time, 10 kg of urea per mu in the early stage, 20 kg in the middle and later stage (or 10 kg of potassium dihydrogen phosphate), ploughing and weeding in 2-3 days after watering, the combination of soil topdressing and foliar fertilizer spraying can be carried out cross, once every half a month, 0. 5% urea plus 0. 3% potassium dihydrogen phosphate, the total concentration does not exceed 1%. The Beginning of Autumn later controlled watering and application of nitrogen fertilizer, foliar spraying phosphorus and potassium fertilizer (0.3% potassium dihydrogen phosphate) to promote branch enrichment.

   6. The branches and leaves grow rapidly after setting up pillar buds and germinating, but the mechanical supporting capacity of the interface is still weak, so it is easy to be broken by the wind or by people and animals. A bamboo pole or stick can be inserted next to it, and the new phase and the bamboo pole can be tied together with a string to play a fixed role. When binding, there should be a gap for the growth of new shoots to prevent strangulation of seedlings. You have to go deep and firm into the ground.

   7. The nursery is generally rich in fertilizer and water, and the branches are easy to grow green and grow. Usually in the middle of September to pick the heart of the new shoots that have not stopped growing. After coring, it can promote the Lignification of new shoots, enhance the overwintering ability of grafted seedlings and prevent striping.

   8. Disease and pest control nursery has high land density, tender branches and leaves, and is easy to suffer from diseases and insect pests. In the process of management, attention should be paid to observation, timely detection and early prevention.