The technology and function of mulch film1

Mulch is a petrochemical product polyethylene product. China's plastic film covering technology was introduced from Japan in 1978. In the first few years, the research and development were carried out in 13 provinces, municipalities and autonomous regions, including the three northeastern provinces, Beijing, Shanghai and Inner Mongolia. Science and technology for the transition to modern agriculture. Since 1983, it has been widely promoted nationwide as a national key promotion project. The mulch looks like a thin layer, but it does a great job. It can not only improve ground temperature, water, soil, and fertilizer to improve fertilizer efficiency, but also have many functions such as weed control, pest control, drought and waterlogging resistance, salt suppression and seedling protection, improvement of near-ground light and heat conditions, and hygienic and clean products. For those newly unearthed seedlings, it has the effect of mulching and promoting growth. For the Three North Regions of my country, low temperature, less rainfall, drought and poor ridges, short frost-free period and other factors restricting agricultural development have strong pertinence and applicability. It has been popularized and applied in 31 provinces, municipalities and autonomous regions across the country, and has been used in more than 40 kinds of crops such as grain, cotton, oil, vegetables, melons and fruits, tobacco, sugar, medicine, hemp, tea, forest, etc., which has generally increased the yield of crops by 30%-50%. %, the value-added is 40%-60%, and it is very popular among farmers. In the past two decades, the application and development of mulch film has been very rapid, and the effect of increasing production and income has also been particularly significant. In 1979, a small-scale experiment began with vegetables, and in 1983, the area covered by plastic film for various crops soared to 629,000 hectares. During the 11 years from 1982 to 1992, 25.067 million hectares of plastic film were promoted. In 1996, the area covered by plastic film exceeded 100 million hectares, reaching 7 million hectares, of which crops that reached or exceeded 380,000 hectares included 1.761 million hectares of corn, 1.816 million hectares of cotton, 605,000 hectares of rice seedlings, 589,000 hectares of peanuts, and 743,000 hectares of vegetables. 600,000 hectares of melon and 380,000 hectares of tobacco.