The reasons for the small size of tomatoes and the slow rate of expansion are the following: Poor fertility, insufficient organic matter content, poor sand retention and fertility. According to a survey conducted by experts, many of the sheds are sand lands, which have poor water retention and fertilizer retention capacity. The amount of organic fertilizer should be increased and soil improved. However, vegetable farmers are obviously lacking in base fertilizer application. The greenhouses are poor in insulation, and the transmittance of the shed film is low. The conditions of temperature, humidity, and light in the shed can not well meet the growth of tomatoes. Creating suitable temperature and light conditions for the growth of vegetables is the key to ensure its normal growth and development. In the survey, it was found that there are many disadvantages in the construction of the greenhouse farmers' sheds, such as the rear roof angle is too small, the sheds are less arched, and the grass cover is thin. Such facilities have poor insulation and affect the transmittance of the shed film, and cannot meet the optimum temperature requirements for tomato growth (25°C~30°C during the day, 15°C~18°C during the night, and keep the day/night temperature difference at 15°C~17°C conducive to fruit enlargement) And lighting conditions. The leaves were too heavy, the vines were injured, and the handles were bent. Vegetables mainly through the leaves for photosynthesis organic products, and then transported to the fruit part for its expansion. However, when the leaves are picked too early and too heavy, the effective photosynthetic leaves of the tomato plants are reduced, which will inevitably affect their normal growth. This type of situation is prevalent in their sheds, and some of the first fruits have not changed, and the picking leaves have reached the third spike. 7 Inch Face Access Control,Face Recognition Access Control With Fingerprint,7 Inch Ultra Thin Face Recognition Terminal,Dual Camera Recognition Access Control System Chongqing Huifan Technology Co.,Ltd. , https://www.hfsecuritytech.com