Walnut Tree Autumn Management "Three Steps"

During the fruiting period, the walnut tree consumes a lot of nutrients of the tree due to the needs of the fruit. The fruit trees are often manifested as debilitating trees and a significant increase in diseases and insect pests. Even the structure of the tree body has changed. Therefore, the walnut tree is harvested after the fruit is harvested. It is necessary to carry out reasonable and effective management. This will not only ensure faster restoration of tree vigor, but also play an important role in preventing the occurrence of pests and diseases. Liu Chaobin, an associate professor at Northwestern University of Agriculture and Forestry, said that while scientific management measures ensure the health of the tree, it also has an important influence on the growth of tree vigor and fruit production in the coming year.

After the fruit is harvested, the soil must be deep

The root of a walnut tree generally penetrates deep into the soil. Whether or not the soil has good air permeability is directly related to the growth of the root system. Therefore, after the fruit is harvested, it is necessary to deepen the orchard soil. Liu Chaobin suggests that the deep turning should select the right timing. Generally, after the fruit is harvested, the debris in the orchard is cleared and the soil is turned deep before falling into the leaves. At 25 to 40 cm. "The higher temperature at this time is also the second peak of growth in the root system. Many roots are easily healed and new roots occur. Soil nutrient conversion is quicker, which is beneficial to the accumulation of tree nutrients," said Liu Chaobin.

Combined with practical and reasonable fertilization

At the same time, in the process of deep-sweeping the soil, it is necessary to apply reasonable fertilization in combination with orchards. Liu Chaobin said that the period of fertilization should be controlled from the beginning of September to the end of October, that is, after the harvest of walnuts. In order to ensure the growth of the tree and the results of the next year, it is necessary to replenish the fertilizer in time and supply sufficient nutrients. In this regard, Liu Chaobin suggested that fertilization can be used to select suitable organic fertilizers and biofungus fertilizers for the growth of walnut trees, improve soil, prevent compaction, promote air permeability, and add appropriate amounts of nitrogen, phosphorus, potassium, and other trace elements. fertilizer. "For the first time, the walnut trees should be made of 30 kg of organic fertilizer, 0.3 kg of biological bacteria, 2 kg of nitrogen, phosphorus and potassium fertilizers, and 200 g/mu of trace elements and fertilizers for Ciba and zinc. Each fruit tree should be given high quality organic fertilizer during fruiting period. 50 pounds, biological bacterial fertilizer 0.5 kg, nitrogen and phosphorus potassium 4 kg, Ciba and zinc trace element fertilizer 300 grams / acre." Liu Chaobin said, when fertilizing, for the 2-4 years of the initial results of the tree, to be under the canopy For trees over 5 years old, fertilization can be carried out in succession, and the fertilizer and soil can be mixed and filled back into the ditch, or the ditch can be turned and the tree plate can be turned over alternately every year. In addition, in order to cooperate with good watering, it is usually timely and fully watered after deep-felling or ditching and fertilizing. During drought years, water can be poured before the soil is frozen.

Pruning requires time and method

When pruning, walnut trees must grasp the right time. Generally dormancy pruning is prone to injury and weakens the tree vigor, and even causes local branches to die. Therefore, pruning time is best controlled before the fall leaves or after spring budding is the most appropriate. “The best pruning period during the autumnal equinox is to help the wounds heal as soon as possible during the year.” Liu Chaobin said that if the pruning workload is large, pruning can be carried out in the winter after 30 days of defoliation—the first 25 days of budding. Injury to the adverse effects of the tree.

The pruning method must also be based on the proper pruning time. Liu Chaobin said that walnut tree saplings are in good nutrition, shoots grow rapidly, and the crown expands year by year. At this time, pruning should pay attention to cultivating the trunk, keeping the main branch, retaining the auxiliary branches, and slowly cutting the densely squeezed branches, legged branches, thin and thin branches. In the crown, multiple branches are left, and pruning is best done in conjunction with pull branches. The densely planted trees are supplemented by pruning branches. Liu Chaobin said that such pruning ensures that the main branch is evenly distributed and well-proportioned. It also allows the canopy to be clearly visible, transparent, and non-biased, ensuring a balanced development of the tree potential, and gradually cultivating a full-sized tree with large results.

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