1. planting time: grafted walnut seedlings are suitable for growing on warm, deep and well-drained sandy loam and black loam, and should be planted on sunny slopes and leeward places. To develop grafted walnut seedlings in barren hills, we must first build terraces, dig large fish scale pits and do a good job in soil and water conservation. Planting time: early planting in spring after soil thawing, early planting in autumn after defoliation and early planting after soil freezing, and early planting in autumn before soil freezing after defoliation. In arid areas in spring, autumn sowing has a higher survival rate than spring sowing. The second spring sprouted early and grew strong. Seedlings planted in autumn should be ridged to prevent drainage. Methods: The trunk of seedlings was bent into an arch to fix the soil, and the trunk was not exposed. The next spring, I broke through the ground and straightened the trunk.
2. Planting method: The main roots of grafted walnut seedlings are very long, and the pit depth and width are 0.8- 1 m respectively. First, fill the topsoil and base fertilizer at the bottom of the pit, about 20 cm away from the pit surface. When planting, use scissors to cut off the seedlings with soaked roots and fully absorbed water, put them in the into the pit vertically, spread the roots around, then fill them until they are flush with the ground, then fill them with water and seal them.
Second, plastic trimming:
It is an important cultivation technique to make grafted walnut seedlings bear fruit early, with high and stable yield and reasonable pruning. The pruning period of grafted walnut seedlings is different from that of ordinary fruit trees. This is done after the fruit is picked and before the leaves turn yellow. In North China, it is best to prune between "White Dew" and "Cold Dew". Pruning at this time, although the temperature is low, the wound heals slowly, but the nutrient loss is less. Young trees can be pruned early because they have no fruit, and they can start from the "Summer Festival". Spring pruning is generally carried out around the "long summer". It's too late, because the branches and leaves are too big and consume too many nutrients, which is not conducive to the growth of trees.
2. Pruning of fruiting branches: The top buds of fruiting mother branches of walnut grafted seedlings are mixed flower buds, so it is generally not allowed to prune every branch, only slender branches, dead branches, insect and disease branches and overlapping branches, so as to facilitate ventilation and lighting and promote the growth of fully robust fruiting mother branches and development branches.
(1) Pruning of fruiting mother branches: robust branches that grow around the crown 1 year are usually fruiting mother branches in the second year, and are generally not cut short. However, if there are too many fruiting mother branches, the crown will be closed, which will affect ventilation and light transmission. Therefore, it is necessary to prune some fine fruiting mother branches appropriately to stabilize the yield and promote the normal development of the tree.
(2) Pruning of extended branches: For the 15-30-year-old trees in full fruit, the 1 year-old extended branches extracted from the top of each main branch outside the crown can be cut short 2-3 buds below the terminal bud. If the top branches are not full, they can be cut off at the full buds to enlarge the crown and increase the fruiting parts.