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First, picking bags prematurely. According to the survey, some fruit farmers to seize the market in order to sell early, to pull the apple pull bags before the time, from the early eighth month of the appropriate early picking bags to early August, picking time is 10-15 days earlier than the original. Due to the short growing period of bagging in the bag, the fruit can not be completely green or green. At the same time, the temperature during the mature period of Jura is still high, and the temperature difference between day and night is small, which is unfavorable for fruit coloring. Therefore, to pick the appropriate bags, the fruit growth period in the bag is not less than 85-90 days, all the greenish-white milky bags are taken out of the bag, and fully matured to achieve full coloration and harvesting.
Second, use inferior bags. Due to the fact that there are many paper bag processing factories in the society and the source is wide, it is difficult to guarantee the product quality. In addition, the long-term growth of the medium-maturing varieties of Gala apples is short, and most fruit farmers are not allowed to use high-quality paper bags to make a lot of inferior paper bags flow into the production process. In particular, the use of poorly shaded paper bags results in a rough green surface. According to the survey, most of the fruit peasant sets of apple paper bags used in more than 80% of the cheap inferior bags, the price is less than 3 cents, high quality bags less than 20%, directly affect the bagging fruit green. Should choose to use good quality shading, quality and reliable paper bags, it is best to use outside the red double red paper bag to improve the fruit bag's green effect.
Third, picky bags on rainy days. It has been observed that rainy days, after picking up bags or taking off bags, are subject to continuous rainy weather. Due to poor lighting, fruits tend to appear green. In particular, fruit orchards that experienced heavy rainfall within five days after bag extraction had fruits that were heavy green, rough fruit, fruit rust, chicken paw patterns, and red dot disease. Fruit quality is not as good as bagging. To select sunny and sunny sunny picking bags, it is advisable that there be no cloudy or rainy days within 3-5 days after bag removal. If it rains after bag extraction, it should be sprayed 300 times immediately and 1200 times Tianda 2116. It is beneficial to control the greenness of fruit, promote the coloration, and improve the finish of the fruit surface.
Fourth, the orchard is closed. The survey found that the orchards with serious greening phenomenon after bag removal have the problem of poor canopy closure. Due to the large number of branches and leaves of the trees, poor illumination has aggravated the occurrence of fruit turning green. Therefore, the transformation of the closed fruit orchards, the adjustment of the tree structure, the elimination of severely shaven branches, and the implementation of high light efficiency management are the main measures to solve the problem of fruit turning green after bag extraction.
Fifth, excessive nitrogen fertilizer. Surveys have shown that the chlorophyll content of bagged fruits gradually decreases under shading conditions. However, due to the extensive use of chemical fertilizers in orchards, the trees are overwhelmed. After picking the bags, the exchange rate of chlorophyll increases after the fruits are seen. Especially under the condition of insufficient illumination, the chlorophyll content in the fruit increased rapidly, and the phenomenon of turning green was obvious. To achieve scientific fertilization, strictly control the amount of nitrogen fertilizer used to prevent the phenomenon of fruit bagging caused by excessive nitrogen fertilizer.
6. Drainage is not timely. Gala apples generally mature from mid-August to early September and are still in a hot and rainy season. Due to frequent rainfall, it is easy to cause turbulence in the orchard. Because the drainage is not timely and the orchard management is not paid attention during the rainy season, the fruit turning green after picking the bag is also heavier. After the rainfall, the water in the orchard should be promptly eliminated and the park should be reduced to reduce the humidity in the park so as to reduce the amount of bagged fruit to return to green.
Reasons and countermeasures of pulling green apples after picking bags
Gala apples generally mature from late August to early September. Due to the short fruit growing period and the mature period in the high temperature and rainy season, due to factors such as climate and management conditions, in the past two years, some fruit orchards have been found to have returned green after picking the bags in the past two years. The quality of bagged fruit is similar to the non-bagging ordinary fruit, which not only affects the quality of fruit, but also increases the production cost and reduces the economic benefits. Therefore, we investigated and analyzed the causes of the greenness of the Gala apple after bag extraction, and put forward corresponding countermeasures.