In summer, the growth period of watermelon is in the hot and rainy season, the plant grows rapidly, and the litchi branches are removed or cut off, which is to reduce the nutrient ineffective consumption and balance the reproductive growth and nutrient growth. The method adopted is basically correct. However, if this measure is carried out in heavy rain or high humidity, it should be noted that the disease spreads with the rain and is easily invaded in the wound, causing the plant to become infected. Second, the general farmland is in the suburbs. There are no tall buildings or lightning protection facilities near the field. If the clouds are low, lightning strikes are very likely. Please pay attention to the rainy days in the future. Safety, to avoid lightning strikes, so as not to lose too much. In addition, high temperature and humidity, it is easier to spread the disease. Such as: blight, anthracnose, downy mildew, etc., the bacteria will invade with the rain of the plant with the rain. Therefore, in the rain-free space, it is necessary to take the sterilizing agent 2-3 times. The recommended drug is 500% thiophanate-methyl, 500% carbendazim, or 600 times 70% carbendazim.
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Fine chemical industry is one of the most dynamic emerging fields in the chemical industry today, and it is an important part of new materials. Fine chemical products have many types, high added value, wide application and high degree of industrial correlation, which directly serve many industries of the national economy and various fields of high-tech industries. Vigorously developing Fine Chemicals has become a strategic focus for countries around the world to adjust the chemical industry structure, enhance the industrial level of a chemical industry and expand economic benefits. The state will issue relevant policies in a timely manner to build a new technology innovation organization that combines production, education and research - the National Fine Chemical Industry Technology Innovation Strategic Alliance, in order to promote the optimization and upgrading of the national fine chemical industry structure and enhance the overall competitiveness of the industry. The rate of fine chemical industry (the ratio of fine chemical output value to total chemical output value) has become an important indicator to measure the development of a country or region's chemical industry and the level of chemical technology.
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