The reasons for the small size of tomatoes and the slow rate of expansion are mainly the following aspects. 1. Poor fertility, insufficient organic matter content, and poor water and fertilizer retention capacity on sandy land. According to the survey, many of the sheds are sandy lands, which have poor water retention and fertilizer retention capacity. They should increase the amount of organic fertilizer and improve the soil. 2. The greenhouses have poor heat insulation and the light transmittance of the shed film is low. The temperature, humidity, light and other conditions in the shed cannot meet the tomato growth well. 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 drawbacks in the construction of the shed, such as the angle of the roof is too small, the arch of the shed is small, and the grass is thin. Such facilities have poor insulation, affecting the transmittance of the greenhouse film, and cannot meet the temperature requirements for tomato growth (25°C to 30°C during the day, 15°C to 18°C ​​at night, and maintaining a temperature difference between 15°C and 17°C for fruit enlargement). And lighting conditions. 3. 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. Access Control System is in the field of intelligent building, meaning Access Control System, referred to as ACS. Refers to the forbidden authority of the "door", is the guard against the "door". The "door" here, broadly speaking, includes all kinds of channels that can pass, including the door for people to pass, the door for vehicles to pass and so on. Therefore, access control includes the vehicle access control. In the application of garage management, vehicle access control is an important means of vehicle management, not for the purpose of charging parking fees, mainly to manage the access of vehicles. Access Control System,Intelligence Applicance,Intelligence Electric,Access Control ChangChun E-vida Technology Co.,ltd , https://www.evidatech.com
Entrance and exit access control security management system is a new modern security management system, it sets microcomputer automatic identification technology and modern security management measures as a whole, it involves electronics, machinery, optics, computer technology, communication technology, biotechnology and many other new technology. It is an effective measure to solve the important department entrance and exit to realize security prevention management. Applicable to all kinds of confidential departments, such as banks, hotels, garage management, machine room, armory, confidential room, office, intelligent community, factories and so on.
Access control system has gone beyond the simple door and key management, it has gradually developed into a complete access management system. It plays a larger role in the work environment safety, personnel attendance management and other administrative management.