Spring and autumn are suitable for proper pruning of walnut trees. Young walnut trees are best pruned in spring, and pruning is mainly based on shaping. Be sure not to cut off too many branches, otherwise it will affect growth; Adult plants are more suitable for pruning in autumn, about165438+1early October, and the effect is better. Through pruning, the outer branches of the crown are sparse and the inner branches are dense. The upper branches are sparse, the lower branches are dense, the big branches are sparse, and the twigs are dense.

First, the pruning of walnut trees

1, pruning time

The best pruning time of walnut trees is spring and autumn. Pruning in spring should be done after the leaves grow, and pruning in autumn should be done after the fruits are picked and before the leaves fall. Young walnut trees are pruned better in spring and adult walnut trees are pruned better in autumn. After the walnut fruit is picked, the leaves slowly turn from green to yellow, and it is best to prune it in autumn165438+1early October.

2, young tree pruning

Choose the main branches and lay a good skeleton, so that all kinds of branches in the crown are distributed reasonably, ensuring ventilation and light transmission in the crown, and forming a good high-yield tree. The general principle of young tree shaping is that there is no need to overemphasize what kind of trees must be shaped and how to do it. Because trees are pruned, shaped with branches, tangible and intangible? Do it. Pruning is mainly based on light cutting, long laying and multi-branches. Young walnut trees have not been planted for a long time and their roots are unstable. When pruning, shaping is the main method. Be sure not to cut off too many branches, otherwise it will affect the growth.

3. Prune trees in full fruit.

Sparse overlapping branches, excessively long fruiting branches, back twigs, upright branches and branches below the main branch of 1 layer on the trunk, and reach? Three thin and three dense? That is, the outer branches of the crown are sparse and the inner branches are dense; The upper branches are sparse, the lower branches are dense, the big branches are sparse, and the branchlets are dense, so as to maintain the healthy growth of fruiting branches and prolong the full fruit period.

Second, the management of walnut trees

1. Walnut is a water-loving crop. In order to ensure the water needed for the growth of walnuts, it is necessary to replenish water in time in case of continuous drought, so as to prevent the phenomenon of water shortage of walnuts, which will have an adverse impact on growth and development.

2. The growth of walnut has a great demand for nutrition. When the soil is cultivated, the base fertilizer is applied, and the base fertilizer and the soil are fully mixed and stirred together to enhance the soil fertility. In the later stage, topdressing should be appropriate according to the growth of trees, weather changes and soil nutrient levels. Fertilization cannot directly pour fertilizer into the pit. Be careful to mix well with the soil, which may burn the roots.

Walnut likes wet waterlogging, but it is not cold-resistant. After harvesting, wintering should be done well to prevent freezing injury. Before winter, the lower part of the tree is painted white and dried to keep warm. In case of heavy snow, sweep the snow around the tree in time. Cover with plastic film to increase surface temperature and prevent frostbite.