Chang Zongtang, a consultant from the old Yangling Association for Science and Technology and a researcher at Northwest A&F University, said that double-layer film cultivation refers to the use of internal thermal insulation measures in facilities such as large sheds, middle sheds, and solar greenhouses. The method of covering with a plastic film increases heat preservation.
The main advantage is that the heat preservation is increased, the cultivated vegetables can be planted earlier, and they can be matured and marketed earlier, which increases the benefit. Generally, the double-layer membrane greenhouse can increase the night temperature by 1 to 2°C than the single-layer membrane greenhouse. The input and output of double-layer film covering melons and vegetables is relatively high. Currently, it is widely used in the production of facility vegetables and melons.
The main disadvantage is that compared with single-layer film coverage, double-layer film requires sufficient space for the second film in the greenhouse facilities. When double-layer plastic film is covered, it needs to be uncovered on time every day during the day so that the cover crops can fully receive the light; cover two films on time at night to keep heat at night, which is more labor and time consuming.
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