Second, timely bagging. Through the research on the effect of different bagging time on the quality of Red Fuji apple, it is proposed that Red Fuji apple is the best time for bagging 45 days after Xiehua. From this, it is inferred that the suitable area around 500 meters above sea level is suitable for bagging before and after June 10, and the film bag can be appropriately advanced 10 days. The eugenic area above 800 meters above sea level is the best bagging time around June 20th.
Third, spray calcium. The photosynthesis of apple sprayed leaves was significantly enhanced, and the fruit growth and fruit quality were significantly improved. In rainy years, bagging orchards are prone to fruit pox disease. In the early period of the end of the timely spraying of calcium orchards, in August, it is necessary to timely spray 2-3 times calcium chloride or calcium calcium and other calcium.
Fourth, phosphorus and potash fertilizer. According to the analysis and analysis, the sugar content of the bagged fruit decreased and the taste became lighter. 0.3-0.5 kilograms of phosphorus and potassium fertilizers can be applied to each apple orchard with more results.
V. Thinning and disease prevention. For bagging orchards with slender spindle-shaped whole trees, the back branches and dense branches should be properly removed in summer to prevent sunburn. If it is endangered by red spider, mink moth, and early defoliation disease, it is necessary to spray the scavenger net or Qizhusu in time, and add Diflubenzuron 3, polyoxin or Nongkang 120. After the removal of the bag, it was selected to spray the water-free emulsion No. 2 800 times, 75% chlorothalonil 600 times, 70% thiophanate-methyl 1000 times + 50% mothaloprene EC 1500 times, to prevent pests and diseases.
6. Check ventilation holes. If there is a lot of rain in late summer and early fall, bagged fruit is susceptible to black spot disease. It is checked every 15 days in the orchard. If obstruction or sealing of the bag corner vent hole is found, open the vent hole with scissors to prevent black spot disease. .
Seven, timely removal of bags. According to the results of continuous photographing of the anthocyanin and chlorophyll in fruit after bag removal, and the results of microscopic changes and color changes in the fruit surface, the harvest period should be determined according to the market, region, and fruit development status, and then the removal period should be determined according to the harvest period. , that is, the first 11-13 days before the collection began to lift the outer bag.
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