1, the use of a reasonable shed structure of plastic greenhouses more shed type, different performance. Production should be based on the local climatic conditions, cultivation season, production level and economic conditions, the rational selection of shed type, which is one of the key measures to ensure high yield, high quality and high efficiency of greenhouse vegetables. 2, the choice of non-drop film plastic greenhouse film attached to a layer of water droplets, the transmittance can be reduced by 20% to 30%. Since there is no water drop attached on the surface of the non-drop film, the light transmittance can be increased, the amount of light can be increased, and the yield and quality of vegetables can be improved. 3. Selecting suitable varieties for cultivation in greenhouses Using plastic greenhouses to grow vegetables, the requirements for varieties are more stringent. To cultivate cucumbers in winter-warm plastic greenhouses, we must use low-temperature, low-light varieties, such as Changchun Mimi, Xintai Michong, Luhuang No.4 and 87-2. In the spring-use plastic greenhouses, the early-maturing varieties that can withstand low temperature and low light and can adapt to high temperature environment, disease resistance and high yield in early stage can be selected. Suitable cucumber varieties include Changchun Mimi, Xintai Michong and Luhuang No.4; tomato varieties include Lufen No.2, Zaofeng and Xifen No.3; green pepper varieties include Xiangyan No.1 and Shenjiao No.1. , Bulgarian pepper, sweet hybrid 1, Zhongjiao 2, etc. In late autumn cultivation of greenhouses, it is necessary to select varieties with high temperature resistance, resistance to disease, late low temperature resistance, and relatively concentrated results. The cucumber varieties promoted in production are Luchun 26, Luchun 32, Jinza No. 1, Jinza No. 2, Jinza No. 6 and so on. Tomato varieties are Lufen No. 2, Jinfen No. 65, Zhongshou No. 4 and Jiafen Number 10 and so on. 4. Grafting and nursery techniques The greenhouse vegetables are grafted and nursed, which can overcome the continuous cropping of the soil and prevent the occurrence of root diseases, and can effectively promote the development of the root system, improve the ability of the roots to resist low temperature, and thus enhance the disease resistance of the plants. According to experiments, cucumber grafted seedlings with black-skinned squash as rootstocks were used. When the temperature of the greenhouse was lower than 6°C, no chilling injury occurred within a week. The control effect of grafted seedlings on cucumber wilt was generally over 90%. Root seedlings increased by more than 20%. 5, using carbon dioxide fertilization carbon dioxide fertilization is a new technology in the protection of cultivation of vegetables is very significant a new technology, increase the rate of production are generally about 30%, especially for the winter production of winter greenhouse and spring greenhouse production in early spring, increase production The effect is even more pronounced. 6, using chemical control technology in the flowering period of tomatoes, with 10 ~ 20 mg / kg 2,4-D solution to prevent flowering; cucumber 2 to 3 true leaves, with 100 ~ 150 mg / kg ethephon Foliar spraying of the solution can significantly reduce the male flower node and increase the proportion of female flowers; treatment of tomato seedlings with 1000-1500 mg/kg of Chlormequat solution can prevent leggy. 7, the use of three-dimensional planting technology, plastic greenhouses to build a higher cost, make full use of greenhouse space for three-dimensional planting, can significantly increase production and efficiency. The three-dimensional cultivation of greenhouses can be based on the growth and development characteristics of different vegetables, using the time difference between the growth period of the early and late growth period of the vegetables, the spatial difference between the height of the plants, the level difference of the depth of the root distribution, and the ecological difference that the vegetables require different environmental conditions. Planting and stratified cultivation, so that it can cultivate a variety of vegetables in a certain area of ​​land, to achieve the purpose of high yield, high quality, and high efficiency. 8, the release of biogas in the plastic greenhouse gas discharge, you can increase temperature qi (ie, add carbon dioxide gas), so as to promote the growth and development of vegetables. According to experiments in greenhouses such as cucumbers, tomatoes, green peppers, and cauliflower, they can generally increase production by 20% to 40%. 9, using drip irrigation technology greenhouse vegetables using drip irrigation under the membrane, can reduce the relative humidity within the greenhouse by more than 10%, cucumber production by 10%, spring yield more than 17%. 10, the use of aluminum film reflective screen using polyester aluminum film spliced ​​into a 2 meters wide, 3 meters long reflective screen, hanging in the plastic post after the upper end of the column, hanging down to the ground, so that the ground can add 40% to 43 %, greenhouse temperature increased by 3 ~ 4 °C, ground temperature increased by 1.8 ~ 2.9 °C, cucumber production by 20% ~ 25%, tomato yield increased by 41.8% ~ 58.1%, and the quality has improved. 11. Multi-layer covering winter and spring seasons, vegetables grown in plastic greenhouses are prone to frost damage, and multi-layered coverage is an effective measure to prevent freezing damage. According to observations, a small arch shed in a plastic greenhouse can increase the temperature in the small arch shed by 2 to 4°C and increase the ground temperature by 1 to 2°C. In plastic sheds, it can be made into a two-layer curtain that covers at night to enable sheds. Internal air temperature and ground temperature increase by an average of 1 to 2°C. A layer of grasshoppers of 1 meter in height is covered around the greenhouse to increase the temperature of the greenhouse by 1 to 2°C. 12, see the city under the use of plastic greenhouse cultivation of vegetable varieties, should be determined according to market conditions, targeting the market gap, Shibu replacement, as much as possible to develop fine vegetables and high-grade vegetables, in order to increase market share and greenhouse production economy benefit.
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