In recent years, the cultivation area of ​​greenhouses and vegetables in China's greenhouses has rapidly expanded, and more and more varieties have been cultivated, and the yield has risen sharply. Many varieties have grown from single-season cultivation in the past to full-year cultivation, and the melon vegetable market has witnessed unprecedented prosperity. While enriching the dining table, people feel that the sheds are becoming less and less odor. Is this what caused it?
According to the author's investigation, the reason why many greenhouses have no taste is that, in addition to the light and air conditions in the greenhouse, the cultivation and management measures such as fertilization and medication are also the main causes.
As the greenhouses are planted again and again year after year, the soil will be used in high intensity and will not be rehabilitated. The content of organic matter will continue to decline, and the lack of nutrients and imbalance will seriously threaten the production of vegetables. In order to ensure the output of vegetables, farmers will arbitrarily increase the amount of chemical fertilizers, and some greenhouse fertilizers will be used 3 to 5 times a year in open-air cultivation. Excessive use of chemical fertilizers produces large amounts of salt that accumulates in the soil. Secondary salinization builds up in the soil. The beneficial microorganisms are in a long-term disadvantageous state and will inevitably affect the yield and quality of the vegetables.
Nowadays, some watermelons in greenhouses are not good to eat? The reason is that partial application of nitrogen fertilizer is one of the main reasons. Nitrogen is an essential element in the synthesis of amino acids, and no nitrogen crop lives. The level of nitrogen nutrition is directly related to the level of crop yield. If nitrogen is not enough, the growth of watermelon stems and leaves is small, and it is difficult to form big melons. However, if nitrogen is too much, the plants are long and the quality is reduced. Nitrogen fertilizers are inorganic nitrogen. In the process of synthesizing organic products under photosynthesis, crops must convert inorganic nitrogen into organic nitrogen. This conversion process consumes a large amount of carbon. In organic-deficient soils, carbon is severely deficient, and carbon is first absorbed by crops and combined with nitrogen. The synthesis of sugars in plants and the carbon needed for cell wall growth are difficult to satisfy. The more nitrogen fertilizers are applied, the heavier the carbon-nitrogen ratio is, the more carbon the organic nitrogen is converted into, and the less carbon is supplied to the invert sugar, so the sugar content of the watermelon is reduced. Watermelon should stop watering 5 days before the harvest, and some people still watered the harvest the day before the harvest, in order to increase the weight of watermelon, but the sugar content decreased significantly. Unreasonable fertilization, watering, and lack of attention to improving lighting conditions in the sheds will inevitably lead to watermelons that look good or not tasty.
Each pesticide has certain conditions and scope in application, and it must be used strictly in accordance with regulations. If overdosed, it will not only affect the normal growth and development of crops, but also cause pollution of products and the environment. For example, in order to pursue high-yield and morning markets, some people use a large number of plant growth regulators such as chlormequat, gibberellin, chlorhexidine, and ethephon in greenhouses to greatly shorten the growth period of tomatoes and market them in advance. Regardless of the size of the fruit, all of them are red and lustful, but the flesh of the cut is blue and white or light red, and there is no mellow and sweet taste. Because this is not really mature, it is bound to have poor taste.
Fertilizers and pesticides that are used as agricultural production-enhancing technologies have played an irreplaceable role in promoting the development of agricultural production. However, only with the scientific application of these stimulation technologies, can we achieve high output, high quality, and increase production and income. In the prevention and control of pests and diseases, we should actively adopt physics, biology and other pollution-free methods to prevent and minimize the use of chemical pesticides. We must rationally use chemical fertilizers and pay attention to the use of organic fertilizers. Organic fertilizer contains all nutrients, and has a slow and effective fertilizer effect. It is an energy source for soil microorganisms and has the function of activating soil microorganisms. Soil organic matter content increased, soil microorganisms also increased accordingly. The decomposition of organic fertilizers by microorganisms can increase nutrient utilization and release carbon dioxide, which provides raw materials for photosynthesis, thereby promoting the synthesis of photosynthetic products and improving product quality. Before using organic fertilizer, it must be fully cooked to avoid harmful substances after application.
Fertilizer has the advantages of high nutrient content and rapid fertilizer efficiency. Reasonable use can make up for the lack of certain nutrient elements in organic fertilizers, and it also has a great effect on improving crop yield and quality. According to the experiment, during the watermelon results, the control of nitrogenous fertilizers and phosphorus-enhanced potash fertilizers increased the sugar content of watermelons by 11.2% to 14.5%, while the same amount of nitrogen fertilizers alone reduced the sugar content by 1.82%. The melons are good potassium crops, but also chlorine crops, avoid the use of chlorine-containing fertilizers, so as not to reduce the quality. During the growth of melon vegetables, attention should be paid to improving the lighting conditions. Non-dropping film should be used, the reflective film on the back wall should be hung, and fill light should be set up to increase the light intensity of the greenhouse. Water is stopped 5 days before harvest. In order to solve the problem of poor taste of the products, the greenhouses and vegetables will be effectively dealt with according to the above requirements.
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