May is the period of post-flowering management, young fruit expansion, new shoot growth, and flower bud differentiation. The quality of management is related to the benefit of the year and the output of the next year. It is necessary to focus on the key points of fruit thinning, fertilizer and water management, summer pruning, pest control, etc. .
Shuding fruit-the best among the best
To determine the reasonable amount of fruit retained by fruit trees, comprehensive consideration should be given to the variety, age, vigor, and management technology level of the tree. In order to ensure the production of high-quality fruits for the trees in the full fruit period, under the general management level, it is appropriate to retain 15,000 fruits per mu. Generally, the fruits are kept according to the distance. Small and medium-sized fruits (Gala). The fruit (Red Fuji) fruit spacing is kept at 20-25 cm.
Fertilizer water-eat and drink well
1. Underground management: The method of planting clover between rows in orchards and covering between plants is promoted, and the height of the grass should not exceed 20 cm.
2. Top dressing: Top dressing is carried out according to the fertility status of the orchard and the amount of fruit set after the fruit is set, and the top dressing is carried out according to the orchard fertility status and the amount of fruit set. Bottom) to promote fruit growth and flower bud formation.
3. Water management: The water management in May has an important impact on the growth of apples. Excessive water content can easily lead to the growth of new shoots, affecting fruit expansion and the absorption and utilization of calcium by the fruit. Excessive soil drought directly affects the absorption and utilization of calcium. Therefore, the soil moisture in the young fruit stage should be kept at 60%-80%.
Controlling the Tree Power-Pulling, Picking, Cutting, Shearing
Comprehensive use of summer pruning measures such as pulling branches, wiping buds, topping, twisting shoots, ring cutting, and removing useless branches to reduce the ineffective consumption of nutrients. In mid-to-late May, saplings that have not been branched, or early-fruit trees that are not branched in place, are branched according to the requirements of different tree shapes. For the first fruit tree, the new shoots should be lightly topped at the right time, that is, about 1 cm of the top of the new shoots are picked, and the new shoots with strong growth potential on the back are twisted from the base to make the nutrition balanced, relax the tree vigor, and benefit the young fruit Grow. Appropriate circumcision (circumcision) treatment of the overwhelming branches. Continue to remove too many new shoots under the cut and on the back of the main branch, as well as new shoots that affect the light in the inner chamber.
Prevent pests and diseases-choose a good medicine
In May, a variety of diseases and insects infested and damaged, mainly powdery mildew, rust, brown spot, anthracnose, ring spot and leaf roller, leaf miner, apple aphid, red spider, etc.
1. Advocate the use of single preparations and try not to use compound preparations.
2. Agents to avoid during the young fruit stage: Bordeaux mixture, Kebo, chlorothalonil, Trimet, mancozeb, etc.; inferior emulsifiable concentrates, penetrants, etc.; sulfur-containing compound preparations. Including carbendazim and thiophanate methyl whose filler is sulfur. At the same time, you should also pay attention: do not spray when there is dew or high temperature at noon; atomization is better when spraying. Pay attention to the alternating use of systemic and protective fungicides, and never use one medicine continuously.
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