In winter and spring, vegetables grown in plastic greenhouses often suffer from low light due to lack of light.
Preventive measures: mainly to improve lighting conditions in the shed as much as possible. When planting, increase the row spacing and reduce shading between the plants; keep the shed membrane clean and prevent the membrane surface from adhering to water droplets and dust; when the external temperature reaches 15°C in the middle and late stages of vegetable growth and before and after noon, properly expose some of the shed film. The sun shines directly into the shed. According to another experiment, a polyester aluminum film is used to splice a reflective screen that is 2 meters wide and 3 meters long. It is hung on the upper end of a post in a plastic greenhouse (or greenhouse) and hangs down to the ground to add 40-43% of light to the floor. Temperature is increased by 3-4°C, ground temperature is increased by 1.8-2.9°C, tomato yield is increased by 41.8-58.1%, and fruit quality is improved; laying silver gray film or aluminum foil on the ground can also increase light intensity between plants and make the fruit color well, and Can prevent premature aging of the lower leaves.
Disposable Virus Sampling Tube
Disposable virus sampling tubes are divided into two types: inactivated and non-inactivated. Inactivated sampling tubes are used for general detection and automatic nucleic acid extraction and detection programs, and non-inactivated sampling tubes are used for rapid detection programs.
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