Full shed plastic film coverage is not desirable
Full-cover mulch film is more commonly used in production practice. The purpose of doing so is to reduce the humidity in the shed and reduce the degree of disease. The full shed mulch film also has its flaws. Firstly, gas exchange between air and soil is hindered, and oxygen is released into the soil and carbon dioxide is released from the soil. The accumulation of carbon dioxide in the soil and the lack of oxygen affect the respiration of the roots of vegetables, and no additional carbon dioxide is produced from the soil. The normal growth of vegetables is blocked. Second, the full shed film covers the soil to increase the harmful gases, it is easy to hurt the roots. As the soil oxygen content decreases, anaerobic respiration of soil microorganisms or denitrification of nitrate nitrogen fertilizers produces reducing gases, such as carbon monoxide and nitrogen oxides, which can seriously affect the normal growth of vegetable roots. Therefore, on the basis of the full coverage of the mulching film in the shed, stalks and rice husks can be applied to the planting belt, which can directly prevent the water in the soil from evaporating and allow the applicator to absorb the moisture in the air. These applicators will also release some heat and carbon dioxide during the decay process, increasing the temperature and photosynthesis of the greenhouse.
Food additives refer to chemically synthesized or natural substances added to food in order to improve the quality, color, aroma and taste of food, as well as for the needs of antiseptic and processing technology. Due to the rapid development of the food industry, food additives have become an important part of the modern food industry, and have become an important driving force for technological progress and technological innovation in the food industry. In the use of food additives, in addition to ensuring that they play their due functions and roles, the most important thing is to ensure the safety and hygiene of food.
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