After bagging apples, it also needs to strengthen the management after bagging, which is crucial for producing high quality apples. Zhang Mingke, an associate researcher at the College of Horticulture, Northwest Agriculture and Forestry University, said in an interview with reporters recently that the fruit after bagging has entered an inflated period, which is an important period for fruit development. The management and pest control at this time are of great significance for improving the quality of fruit trees.
Soil management
After bagging apples, the soil should be deep-ripened and ripened on the rainy day. This will increase the permeability of the soil on the basis of the soil improvement, and at the same time it will expand the distribution range of the root system. Zhang Mingke said that the depth of soil deep turning is generally 80 to 100 cm. It is advisable to adopt the method of year-by-year, inter-deep deep turning, which can effectively prevent the problem of excessive deep rooting at one time; at the same time, it is necessary to do orchards well. Grass-covering work is conducive to the absorption and development of roots and has obvious drought-resistance effects. The thickness of the cover is usually 15 to 20 centimeters, covering raw straw, weeds, and leaves as raw materials for on-site extraction.
Rational fertilization
Zhang Mingke stated that the orchard after bagging is different from apple orchard without bag cultivation in terms of fertilizer application amount, fertilization type, fertilization plan, fertilization method, etc. In contrast, the amount of fertilization after bagging is larger than that of bagging. Before the bag, the application amount of trace element fertilizer should be increased. The type of fertilizer to be applied depends on the growth of the tree and the amount of fruit produced. It is generally recommended that fertilization be applied. The ratio of nitrogen, phosphorus and potassium should be controlled at 2:1:1. In the application of basal fertilizer, the time is generally controlled in the early fall season. It is better to use the standard of 2 kg of organic fertilizer for 1 kg of fruit in the full fruit period. To promote fruit fertilizer, compound fertilizer is appropriate; In addition, to do a good job of foliar spray fertilizer, choose to spray potassium dihydrogen phosphate, rare earth, sugar enhancer, etc., to increase the sugar content of bagging fruit, and promote fruit coloring.
Appropriate irrigation
“After the bag is finished, water should be poured once in a timely manner to prevent the occurrence of sunburn phenomenon.†Zhang Mingke said that summer should be based on the soil drought conditions, so that “with irrigation with drought.†Zhang Mingke also reminded that when irrigation, pay attention to the following periods: During the critical period of flower bud differentiation, irrigation should be controlled to promote flower bud differentiation; water should be banned before harvest to increase sugar content of fruit and promote fruit coloration; orchard autumn When hot and dry, in order to prevent the sunburn disease of the fruit, water can be poured before bagging.
Pest prevention and control After bagging, it is necessary to focus on the prevention and control of early defoliation, ringworm disease, spider mites, locusts and other pests and diseases, and at the same time pay attention to prevention and treatment of special diseases and insect pests caused by bagging, such as bitter pit disease, Cornell aphid Wait. Zhang Mingke said that apple should be sprayed with fungicide immediately after bag extraction to prevent rotten fruit disease and avoid use of Bordeaux mixture to avoid contaminating the fruit surface and affecting fruit quality. Early leaves are treated with 70% thiophanate-methyl 800 times; Ringer's disease is 25% with Carbonate 600 times; Red spider is used with 15% broom; 2500 times; Aphid is used with 20% imidacloprid 20%. liquid. Bitter bitter disease sprays 0.3% calcium nitrate before flowering or before bagging for calcium supplementation. When applying drugs before bagging, add 10% imidacloprid 3000 times to prevent the occurrence of Conradronia.
Fruit management after bag extraction
"To carry out autumn cuts in a timely manner, we must clear the branches of the canopy within the canopy, sparsely compete with the outside branches, and the upright shoots on the backs of the trunks, so as to improve lighting conditions within the canopy." Zhang Mingke said that removing the fruits nearby affected the coloration of the fruits. The leaves, after about ten days of picking the bag, are to be transformed once, so that the shade of the fruit can also be directly exposed to direct sunlight and the fruit surface can be fully colored. In addition, naphthalene acetic acid and 0.2% B9 should be sprayed approximately one month before harvest to prevent fruit drop and promote fruit coloration. After taking the bag, supplement the calcium amino acid once to prevent the occurrence of bitter pit disease.
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