The use of plastic greenhouses or mulch film to cover the cultivation of tea trees in the winter can allow spring tea to be harvested 15-30 days in advance, and improve tea yield and tea quality. The main function of greenhouses is thermal insulation and frost protection. Therefore, the time for erecting the cover film depends on the local climatic conditions. Generally, the cover film is erected before the onset of frost, and the film is removed in the middle and early April of the following year. The construction procedure of the greenhouse is roughly as follows: First, according to the design volume of the greenhouse, the plastic film is spliced ​​and ironed with electric iron, and then the column is raised at a distance of 1-1.5 meters in longitudinal direction and 5 to 7 meters in lateral spacing in the selected tea plantation. The ground is 2-2.5 meters, and then the arch is erected on the column and fixed with steel or bamboo. After the bracket is fixed, a hot film is attached and tightened. The upper pressure rod is fixed and the surface is sealed with mud. When covering the film, a long, openable ventilation channel should be set at a height of 1.2 meters above the ground on both sides of the greenhouse so that the temperature and humidity can be adjusted in the future. Both sides of the greenhouse are set in and out. The height of the general shed is about 3 meters in height, about 1.6 meters high on both sides, the roof is arched, spans 5-8 meters (about 3-5 tea lines), and the length of the shed is 40-60 meters, that is, a greenhouse with an area of ​​0.5 Mu is more appropriate. Plastic film greenhouse tea gardens should be managed by special personnel to observe temperature, soil temperature, humidity, and germination of tea shoots in the record shed. In the fall (late October and early November), organic fertilizer should be applied. Mushi 1500 kg of manure or 150-200 kg of cake fertilizer and 40 kg of urea should be applied. After the greenhouse is covered and the weather is continuously fine and the open air temperature is above 10°C, fresh water should be sprayed once every 1-2 days, or sprayed with foliar fertilizer, but the concentration should be lower than that of open-air tea gardens. When the outside temperature suddenly rises on a sunny day and the temperature in the shed exceeds 35°C, the plastic film on both sides should be uncovered in time to ventilate the heat and prevent high temperature from burning tea buds. In case of stormy weather, it is necessary to reinforce the shed in time to prevent rain and snow from collapsing.
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