Background color back to green
Some of the problem farmers are looking at the prospect of "selling point" in the red Fuji market before the Mid-Autumn Festival, and picking up the paper bag early to late August to early September. As a result, the red Fuji with a white background after the bag was removed, and the background color began to return to green after 5 days, which made it difficult to meet the merchant's acquisition requirements. In this way, the paper bag fruit that could have been sold at a high price can only sell a common fruit price.
The reason is that we know that the fruit of the late-maturing coloring Fuji, such as Changfu No. 2, has a growth period of 180 days. The nutrition of fruits and leaves began to transfer and accumulate in the 30 days before maturity, and the ethylene content gradually increased. Prior to this, the chlorophyll content of the bagged fruit was reduced under shading conditions, but as long as the tree grew normally after the bag was removed, the chlorophyll of the leaves and fruits could be exchanged continuously. The more prosperous the tree, the faster the exchange rate after the fruit sees the light. The tree potential is relatively stable or weak, and the phenomenon of greening the fruit of the early bag is not obvious.
It is the key to ensure that the fine skin of the fruit is bright and tender. It is observed that the red Fuji bag has a long-term survival time of about 100 days. It is estimated that the bag harvesting in Shaanxi Weibei is from September 20 to the end of September.
The eugenic fruit area at a higher altitude (above 800 meters) has a cold climate, and picking up bags from September 20th to 25th is good for coloring.
Some low-altitude (500-700 m) suitable areas in northern Fujian are picking up bags too early, and the temperature difference is not conducive to coloring. Note that the bag removal time is closely related to climate change. It is necessary to prevent the premature color of the bag from returning to green and rough, and to prevent the bag from being too yellow to be colored. It has also been observed that it is suitable to remove the bag during the bag-free period (September 25th to October 1st).
Fruit sunburn
In recent years, fruit farmers have chosen to have a successful experience of “one-time bag removal†in a cloudy day. However, the risk of doing so is very high. If you encounter high temperature and strong sunshine in 1~2 days after taking off the bag, it will cause a lot of sunburn fruits. The light part is white, and the burnt part of the heavy one becomes brown.
The reason for the long-term bagging fruit is in the micro-environment of shading, heat preservation and moisturizing. If the violent and high temperature suddenly changes the environment after the bag is removed, the delicate peel will cause sunburn due to excessive temperature and drastic changes in the environment.
Countermeasure divided bags are an effective measure to avoid and reduce sunburn. The fruit of the double-layer paper bag is advocated to remove the bag first, and the inner bag is removed after 3 sunny days; the single-layer paper bag should first tear the back side of the fruit bag and remove it once every 3 sunny days; the paper bag should be paper bag Torn, remove the paper bag after 3 sunny days, keep the film bag colored, and then take the film bag for storage and storage after the color is full or sell the bag according to the requirements of the merchant. Picking up the bag during the day should avoid the high temperature period at noon, which is conducive to the fruit gradually adapting to environmental changes and reducing sunburn.
Water crack
The problem water cracks mainly occurred in the 3~4 days after picking up the bags in the years when the high temperature and drought lasted for a long time. September 20 to October 10 is a period of rapid expansion before fruit ripening, and it is also a high incidence of water cracks, which should cause enough attention of the majority of fruit farmers.
The reason why water cracks belong to the intermittent water supply during the growing season, the inability of the pericarp cells and the flesh cells to develop synchronously is the main reason for the cracks. The paper film bag and the film bag fruit rarely cause cracks due to the good moisture retention of the whole growth period of the fruit.
Countermeasure Balanced water supply is the main measure to reduce the rate of water cracks. Especially in the second expansion period in August, it should be timely flooded during the drought, but it should not be flooded in the whole garden (without pouring between the plants or between the plants), and the grass after the irrigation can ensure the soil in the growing season. Water balance supply, so that the skin and pulp cells grow and develop simultaneously, reducing the proportion of fruit cracks. According to the survey, from September 20 to October 10, the fruit is rapidly expanding before and after the bag is unpacked. Do not irrigate the water. After the irrigation, the fruit sputum and the fruit stalk rate increase significantly.
Because the water before and after the bag is exposed to high temperature, the fruit is reduced due to the high temperature during the day. At night, the pulp is swollen due to the water, and the skin is broken due to excessive tension, forming a water crack.
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