This greenhouse used in Saudi Arabia is designed with an arched roof and is covered with membrane. Surrounded by solar panels. The top covering film can use a film roll to achieve top ventilation. It is also equipped with a fan and water curtain for cooling. Each span has 3 sets of fans for cooling.

There is also a structure in the form of main and auxiliary beams in the arched circular structure greenhouse. The main beams are directly connected to the columns, and the secondary beams are connected to the gutters. The main beam spacing is the bay size of the greenhouse, which is generally 3~4m. Some greenhouses have the same main beam and auxiliary beam structure, and the main and auxiliary beams are spaced apart; some greenhouse auxiliary beams only use a simple arch rod, and 2 to 3 auxiliary beams are generally set between every two main beams. An extreme variation of this structure is that there are no main beams on the entire roof, which is called a full lead beam structure. It is similar to a floor-standing plastic greenhouse installed on the gutter. In this form, the spacing of the arch poles is usually within 1m.

Natural ventilation systems for different greenhouse types.

In order to achieve natural ventilation, ventilation windows such as roof windows and side windows are set up in the greenhouse to form a greenhouse natural ventilation system. According to the different characteristics of each type of greenhouse, different ventilation window settings and ventilation window opening and closing types are adopted to determine sufficient wind window area to form different types of natural ventilation systems.

 

 

Tomato is a temperature-loving vegetable. Under normal conditions, its optimal growth and development temperature is 15℃--29℃, and the suitable temperature for photosynthesis is 20--25℃. When the temperature is lower than 15°C, it cannot bloom, or pollination and fertilization are poor after flowering, resulting in physiological disorders such as flower and fruit drop; when the temperature is lower than 10°C, the plant stops growing; when the temperature is lower than 5°C, it will cause low temperature damage over time; -2°C ~-1℃, it can be frozen and die in a short period of time; when the temperature is higher than 30℃, its assimilation effect is significantly reduced; when the temperature is higher than 35℃, flowering and fruiting are inhibited, and reproductive growth is interfered with or destroyed; short-term High temperatures of 40°C will also interfere with physiological growth, leading to flower and fruit drop or poor fruit development.

this is 15000 sqaure meter tomato greenhouse