High temperature and high humidity season, high temperature, high humidity, climatic conditions conducive to the spread of pests and diseases, prevention and control of pests caused by the critical period. At the same time, the new shoots of apple trees have also entered the second prosperous period, and fruit development has entered into the period of enlargement. It is a management focus of the period to do a good job of controlling the tree vigor and promoting the good development of young fruit.
Strengthen water and fertilizer management
1, a reasonable fertilizer. Whether or not topdressing the apple tree depends on the variety, the amount of fruit to be put on, and the previous period of fertilization, etc. The primary phosphorus and potassium fertilizers can be topdressed. The key is mainly potassium fertilizer, and the amount of fertilizer depends on the tree. On the other hand, early-maturing Chinese cultivars No.8 and No.1 were top-dressed in early July, and Fuji apples were chased once every month from mid-July to mid-August. Since July and August are in the rainy season, if the weather is not dry, water can not be used to fertilize with rainfall.
It is recommended that water and fertilizer be applied during the expansion period. The soil moisture content has a great influence on the fertilization effect. In the practice of agricultural production, the soil moisture content is controlled through reasonable irrigation or drainage, so as to increase the soil effective nutrient content, increase the fertilizer utilization, and enhance the fertilization effect. the goal of.
2, foliar spray fertilizer. Combination spraying of phosphorus, potassium, calcium, and iron fertilizers in the combination of drugs in July and August has an important role in increasing the sugar content of fruits, promoting coloration, and reducing the physiological diseases of fruits.
3, orchard drainage. In the rainy season, the orchards cannot accumulate water for a long time, otherwise it will affect the orchard soil permeability and the growth of apple tree roots. After the rainfall, it must be drained in time to keep the orchard soil moisture relatively stable.
Regulatory tree potential
In July and August, it is suitable for the vegetative growth of apple trees, especially the early-fruiting young trees and fruit-bearing mature trees. The unripe growth of summer and autumn shoots, if left unchecked, will affect flower bud differentiation, resulting in nutrient loss, tree-like disorder, and lowering. Fruit quality, therefore, according to the age of the tree, tree vigor, results, etc., take appropriate measures to regulate and maintain a strong tree growth. For the young saplings without fruiting or fruiting, the circumcision of the second trunk or main branch can be carried out at the beginning of July. At the same time, it is necessary to do a good job in summer pruning. The focus is to eliminate standing erect branches on the back, long branches inside the branches, branches and branches of the branches, and useless branches that affect the light, and twist the branches slowly to achieve control. , improve lighting conditions, promote fruit development and flower bud formation purposes.
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