Based on the structural principles of multi-span film greenhouses, strict requirements are placed on the care conditions for these structures. Appropriate temperature and light are essential for the optimal growth of greenhouse crops, necessitating that farmers understand the patterns of temperature and light changes to enhance crop yields. During the day, sunlight passes through the plastic film into the greenhouse, raising the temperature. At night, or on cloudy days with weaker solar radiation, the greenhouse's strict insulation equipment minimizes heat loss. So, how can the light in multi-span film greenhouses be controlled?

Film Greenhouse Cluster Management Measures

Year-round, especially during the winter and summer, there is a significant temperature fluctuation. Growers need to adjust for insulation and cooling to ensure the proper growth of vegetables. Below, we will specifically introduce the light control measures for multi-span film greenhouses:

Proper control measures should be taken for multi-span greenhouses. To protect vegetables from the harm of low temperatures, sufficient lighting should be implemented during the day to increase the temperature inside the greenhouse, and strict protection should be provided at night to shield the temperature from fluctuations in cold and heat. When the temperature inside the greenhouse is low, additional coverings should be added. Upon the arrival of cold waves, when the temperature drops below 0°C, the greenhouse should be covered with straw curtains, raising the temperature by 2°C compared to when it is uncovered at night. A closed greenhouse can maintain a temperature 4°C higher than 6°C. Ground cover can increase soil temperature and reduce humidity inside the greenhouse.

Therefore, the primary goal of the adjustment technology is to increase the amount of indoor light and extend the duration of illumination. Firstly, a reasonable greenhouse structure is necessary, followed by good covering materials with high light transmission rates, which are two crucial conditions. Generally, the light transmission loss of clean films is 20%, and with dirt, the loss increases to 20%.