Multi-dimensional analysis of the effect of air permeability of mango fruit protection bags on mango growth

1. Gas exchange and respiration
Mango is a typical respiratory climacteric fruit, which needs frequent respiration during its growth process to generate energy and maintain normal physiological activities. A well-permeable protective bag allows mango to carry out necessary gas exchange with the external environment, that is, oxygen enters the bag for mango to breathe, and carbon dioxide is discharged from the bag. The smooth conduct of this gas exchange is the basis for mango to maintain normal respiration.

When the air permeability of the protective bag is insufficient, the oxygen concentration in the bag will gradually decrease, while the carbon dioxide concentration will increase. This change in the gas environment will have a negative impact on the respiration of mango, resulting in a decrease in respiration rate and insufficient energy supply, which in turn affects the growth rate and physiological metabolism of mango. Mango may experience slow growth, yellowing of leaves, and poor fruit development if it is in a low-oxygen and high-carbon dioxide environment for a long time.

2. Temperature regulation and prevention of heat damage
Mango is a common fruit tree in tropical and subtropical areas, and has high temperature requirements. Mango fruit protection bags with good air permeability can regulate the heat exchange inside and outside the bag, so that the temperature inside the bag is kept within a relatively stable range, which is conducive to the growth of mangoes. In the hot summer, protective bags with good air permeability can reduce the temperature inside the bag by increasing the convection of air inside and outside the bag, thereby preventing mangoes from being damaged by heat.

If the air permeability of the protective bag is poor, the temperature inside the bag will rise rapidly, forming a small "greenhouse effect". In a high temperature environment, mangoes are susceptible to heat damage, which manifests as leaf burns, fruit sunburn, physiological metabolic disorders, etc. Heat damage will not only reduce the yield and quality of mangoes, but may also cause a series of diseases, such as anthrax and stem rot, which will further affect the growth and development of mangoes.

3. Humidity control and disease prevention
Protective bags with good air permeability can also regulate the humidity inside the bag to a certain extent and maintain a suitable microenvironment. Mangoes need an appropriate amount of water during their growth, but too much water will lead to the growth of diseases. Protective bags with good air permeability can reduce the humidity inside the bag and reduce the occurrence of diseases by promoting the convection of air inside and outside the bag.

On the contrary, if the air permeability of the protective bag is insufficient, the humidity inside the bag will rise rapidly, forming a humid environment. This environment is conducive to the growth and spread of diseases, such as gray mold and anthracnose. The occurrence of diseases will not only affect the growth and development of mangoes, but also reduce the quality and yield of the fruit.

4. Photosynthesis and nutrient accumulation
Although the main function of the protective bag is to protect mangoes from interference from the external environment, the air permeability will also affect the photosynthesis and nutrient accumulation of mangoes. The protective bag with good air permeability allows an appropriate amount of light to penetrate the bag, providing the necessary light conditions for the mango leaves, promoting photosynthesis and nutrient accumulation.

If the air permeability of the protective bag is poor and the light inside the bag is insufficient, the photosynthesis of the mango leaves will be weakened and the nutrient accumulation will be reduced. In the long run, the growth of mangoes will be inhibited, and the quality and yield of the fruit will also decrease.

5. Fruit development and quality improvement
The protective bag with good air permeability can provide a suitable microenvironment for mangoes, promoting the normal development and ripening of the fruit. During the fruit development stage, a well-ventilated protective bag can ensure that the fruit has sufficient oxygen and carbon dioxide supply to maintain normal respiration and metabolic processes. A suitable temperature and humidity environment is conducive to the cell division and expansion of the fruit, and improves the yield and quality of the fruit.

During the fruit ripening stage, a well-ventilated protective bag can promote the improvement of the fruit's uniform color, delicious taste, rich aroma and other qualities. On the contrary, if the protective bag is not well-ventilated, it will lead to problems such as poor fruit development and quality decline.