Recently, it has been discovered that some orchards have returned to green after unbagging (early maturing varieties include Matsumoto Nishiki, Shinano Red, Meihachi, Chenyang, Qinyang, Gala, etc.). Orchards with serious greening phenomenon, bagging The fruit quality is similar to the ordinary fruit without bagging, which not only affects the quality of the fruit, but also increases the production cost and reduces the economic benefit. Therefore, we investigated and analyzed the reasons why Gala apples turned green after unpacking, and put forward corresponding countermeasures.
The reason why Gala apple turns green after unpacking 1. Unpacking time is too early. Because some fruit farmers have pushed the unpacking time of Gala apples forward in order to sell them early, the unpacking time has been advanced from mid-to-late August to early August, and the unpacking time is 10-15 days earlier than the original. Due to the short growth period of the unbag early fruit in the bag, the fruit cannot completely turn green or the green color is poor. At the same time, the temperature of Gala is still high during the mature period, and the temperature difference between day and night is small, which is not good for the color of the fruit.
2. Use inferior fruit bags. Due to the fact that there are many paper bag processing factories in the society and the sources are wide, the product quality is difficult to guarantee, and the growth period of the mid-ripening variety of Gala apple is short, most fruit farms cannot use high-quality paper bags, causing a large number of low-quality paper bags to flow into the production process. In particular, the use of paper bags with poor light-shielding properties resulted in poor greening of the fruit surface. According to the survey, more than 80% of the paper bags used by most fruit farmers to cover Gala apples are cheap and inferior bags, the price is less than 3 cents, and the high-quality bags are less than 20%, which directly affects the greening of the bagged fruits.
3. Pick up the bag in rainy weather. After unpacking or taking off the bag on a cloudy or rainy day, in continuous rainy weather, the fruit is prone to turn green due to poor light. Especially in the orchard where heavy rainfall occurred within 5 days after unpacking, the fruit returned to green and the surface was rough, and the fruit rust, chicken feet, and red spots were serious. The quality of the fruit is not as good as the fruit without bagging.
4. The orchard is seriously closed. The investigation found that in orchards with serious greening phenomenon after unpacking, the problem of poor permeability of the orchard canopy is common. Due to the large amount of branches and leaves of the tree, poor light, aggravated the occurrence of fruit green.
Countermeasures to prevent Gala apples from turning green after unpacking 1. Unpack the bags in a timely manner. The growth period of the fruit in the bag is not less than 85-90 days, and all the fruits are chlorosis and milky white before being taken out of the bag, and harvested after being fully matured and fully colored.
2. Choose to use high-quality fruit bags. You should choose to use high-quality paper bags with good shading and reliable quality, and use double-layer paper bags with outer gray and inner red to improve the greening effect of fruit bags.
3. Choose a suitable period for unpacking. Choose to pick the bag in a continuous sunny day with mild sunshine, and there will be no cloudy or raining process within 3-5 days after picking the bag. It is beneficial to control the greening of the fruit, promote the coloring, and improve the smoothness of the fruit surface.
4. Pay attention to summer pruning. Renovation of closed orchards, adjustment of tree structure, removal of backbone branches with severe shading, and implementation of high light efficiency management are the main measures to solve the problem of greening the fruit after unbagging.
5. Reasonable fertilization. Scientific fertilization and strict control of the amount of nitrogen fertilizer used to prevent the phenomenon of greening bagged fruits caused by excessive nitrogen fertilizer. The 0.3%-0.5% solution of potassium dihydrogen phosphate should be sprayed 15 and 5 days before unbagging to accelerate the synthesis and transportation of anthocyanins and promote fruit coloring.
6. Lay reflective film. After unpacking, lay the reflective film in time to increase the utilization rate of sunlight, so that the fruit is fully exposed to light, and the synthesis of anthocyanins is promoted to facilitate the coloring of the fruit.
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