[ Agricultural Products Network] After the freeze, the fruit garden will be “indiscriminate.†If left unchecked this year, apple trees will suffer from malnutrition, large-area deciduous or long-lasting trees, flower bud differentiation will be affected, and small years will occur in the second year. So even though there are fewer apples in the tree this year, even the fruit farmers still need to strengthen management, and at the right time, fertilize and fight drugs to prepare for the bumper harvest next year.
First, no flowers
The orchard that suffered from freezing damage temporarily stopped flowering and fruit thinning. After the fruit is stable, it will be flexible and residued according to the high rate of fruit set, the severity of freezing damage, the pros and cons of young fruit and the strength of the tree. The orchard with heavy damage should make full use of the central fruit of the late-opening side flower and the flower bud to increase the income.
In addition, it should be noted that the younger fruit that is less damaged by freezing has the symptoms of “frost ringâ€, that is, the ring rust on the fruit surface of the young fruit will affect the commerciality of the fruit, and may be considered as appropriate.
Second, spraying planting agents to improve the fruit setting rate, commodity
Affected by the high temperature of the previous period and the late frost of the flowering period, even the quality of the fruit already sitting on the tree is not as good as in previous years. Mainly due to the low temperature of apple pollination and fertilization, the formation of less seeds , coupled with the late frost and frost damage to some of the seeds , may be due to the small number of seeds, poor quality resulting in physiological fruit drop and affect the apple's head.
Therefore, it should be sprayed with triacontanol+6-benzylaminogibberellin in time to effectively increase the fruit setting rate, promote the expansion of young fruit, and improve the commerciality (good fruit shape, good surface light).
Third, topdressing strengthens the tree
For the orchard where the freezing damage is not heavy, the frozen young fruit and young leaves are in the stage of restoring growth, and need to consume a lot of nutrients. According to the tree potential, the high-nitrogen type or balanced type trace element water-soluble fertilizer + Guoguanggen should be applied in time to promote Roots, foliage growth and fruit enlargement.
Fourth, timely summer shears
Due to the decrease in load, some of the fruit trees begin to grow. In order to avoid excessive consumption of nutrients, the heart should be topped, twisted, and taken. The trees should be moderately cut or stripped in time to facilitate apple flower bud differentiation. . However, when picking the heart, twisting the tip, and taking the branch, it is easy to damage the tree. It is recommended that everyone combine the plant growth retardant on the basis of the summer shear to control the flower to reduce the workload and cost of the summer shear.
Fifth, the application of phytochemicals to control the promotion of flowers
In the long-term (10-15cm) of apple spring shoots, 50% chlormequat + potassium fertilizer can be used to spray the tip of the shoots, spray once every 15-20 days, and spray 2-3 times during the whole growth period. According to the tree potential fine-tuning use concentration and interval of use, to achieve the purpose of controlling shoot growth and promoting flower bud differentiation.
Because there are many factors affecting the degree of frost damage to apples, if the geographical position and tree strength of the park are strong, the fruit farmers should make the damage to the minimum level according to the damage of the orchard, and prepare for the next year's high yield.