Selenium was considered to be a toxic element in the past. It was not until the 1950s and 1960s that selenium was recognized as an essential trace element in animals. In 1973, the United Nations Health Organization announced that selenium was an essential trace element in the human body. In 1988, the Chinese Nutrition Society selenium Includes one of the daily dietary nutrients. Two thirds of China's areas are selenium-deficient regions, of which one-third are seriously deficient in selenium, and about 700 million people live in low-selenium areas. In view of the fact that most areas in China are poor in selenium and there is a serious shortage of selenium intake by local residents, in recent years, various regions have researched and developed production technologies for selenium-enriched agricultural products, setting off a selenium upsurge in selenium-deficient areas. The development of selenium-enriched rice has important social and economic significance for improving the health of the people, improving the quality of rice, increasing the quality of rice, increasing the added value of rice, and increasing the income of farmers. Especially in the current situation of low grain yield, the development of selenium-enriched rice may be an effective way to increase efficiency. First, the physiological role of selenium In recent years, research results show that selenium has the following main physiological functions: 1, selenium has a strong antioxidant capacity, its role is similar to vitamin E, but more effective, can regulate the body's redox reaction Speed, affecting the metabolism and activity of certain important enzymes, regulating the absorption and consumption of vitamins A, C, E, and K in the body, participating in the synthesis of coenzymes A and Q, improving the body's immunity, and anti-aging. 2. It has strong antagonism for certain carcinogens, can inhibit chemical carcinogens, decompose carcinogens, such as aflatoxin, tetraethyl lead, etc., and can also prevent the accumulation of harmful metal ions in the human body such as lead. Excreted mercury, arsenic, nickel, etc., have natural detoxification and detoxification effects. 3, can maintain the normal structure and function of the cardiovascular system, prevention of cardiovascular disease. In Keshan disease, which is characterized by myocardial damage in our country, selenium deficiency is an important factor. 4, protect the visual organs. Selenium is one of the important components of glutathione peroxidase in the body. This substance can remove peroxides and free radicals in the human body, including the eyes, and protect the eyes from damage. If the human eye has long been deficient in selenium intake, vision loss and many eye diseases such as cataracts, retinopathy, and night blindness will occur. 5. Selenium is essential for fertility and reproduction. Second, the selection and application of selenium-enriched agents Currently on the market more selenium-rich products, it is inevitable that the pros and cons. The selenium-enrichment agent we recommend is the “sunflower†brand solid selenium-enhancing agent developed and produced by the Heilongjiang Academy of Agricultural Sciences. The specification is 100g/bag. The product is a solid foliar fertilizer containing large, medium and micronutrient elements. Trace element selenium is added to the product. The foliar spraying of 1 selenium-enriched production agent per mu for rice from the breakage to the heading stage can significantly improve the late ripening phase, increase the seed setting rate, increase the grain weight, early maturity and increase the yield, and can double the increase of selenium. content. Generally, it can increase rice production by more than 5%, and 2 days ahead of maturity. The selenium content in rice is 2-7 times higher than that of the control. Third, the selenium-enhancing agent application method in the rice break to the heading period with 1 bag of selenium-enriched agent per acre foliar spray, the first bag of the mother agent dissolved with a small amount of water, then add the rest, then add water 20kg, stir well and spray evenly on rice leaves with a sprayer. Spray time should be selected as soon as possible, such as spraying within 8 hours after the rain, to re-spray.
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