Laissez-faire pruning of trees in walnut producing areas

   there are many walnut producing areas in China with extensive management, only harvest, little pruning, and let them grow into laissez-faire trees.

   1. Structural characteristics of laissez-faire trees the general characteristics of this kind of trees are as follows: many backbone branches, disordered tree shape, bald inner chamber, withered branchlets, poor ventilation and light transmission, serious outward movement, strong upper and lower weak, and unclear hierarchy.

   2. Pruning method

   (1) shape with the tree, because of tree pruning, flexibly control the height of more than 5 meters of the tree first open the skylight, gradually drop the head, pay attention to the heel branches under the sawing mouth. For trees with too many big branches and bald rear, 5-7 large branches with good orientation, proper distance and strong growth should be selected as the main branches, while the other big branches should be retracted or thinned, but be careful not to act too hastily, and should be treated year by year and in batches so as not to cause too many large wounds and weaken the tree. The leader stem can be obviously transformed into an open hierarchical shape, otherwise it can be cultivated into a natural happy shape, avoiding excessive tree shape, big sawing and affecting the output. The small trees with skewed trunk must be righted, the main branches upward after the trunk is askew grow vigorously, and the growth of the main branches behind is often weakened, resulting in an imbalance in the growth of the basal main branches. For strong branches to open a large angle, or appropriate retraction control potential to maintain the coordination between the main branches of the United States.

   (2) analyze the big branches, adjust them reasonably, and make sure that the big branches of the laissez-faire tree are crowded and dense, so that the redundant main branches can be retracted and transformed as the side branches of the adjacent main branches to supplement the space. The growing trees on the trees should be retracted or thinned in time, and when there is space, they can be flattened and transformed into twigs or branches.

   (3) the branches of the outer scorched shoots can be retracted properly to the branches with branches in the inner chamber, which can promote the sprouting of new branches in the inner chamber and restore the tree potential. For weak drooping branches and dead branches can be removed to promote vegetative growth.

   (4) in the cultivation and renewal of the reformed tree, the inner chamber often germinates and grows branches, which must be transformed into the fruiting branch group in time. For the overlong branch group, the perennial branch group is shrunk to retain strong branches and buds, so as to renew the branch group and enrich the crown. The results of culture should be a combination of large, medium and small branches.