The role of carbon dioxide monitor in greenhouse control
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Through the monitoring data of the carbon dioxide monitor, it was found that due to the photosynthesis of plants, the day-night variation of carbon dioxide concentration in greenhouses is relatively large. In the greenhouse, the highest concentration of carbon dioxide in the morning reached 1.2 mL/L; as the photosynthesis of plants increased during the day, the concentration of carbon dioxide remained relatively low. After 1600 hours, the photosynthesis of the plant weakened and the carbon dioxide concentration began to rise. At night, carbon dioxide was released under the action of plants and soil, gradually increasing the concentration of carbon dioxide to the highest point of the day. In greenhouses of other crops, there is a similar change in carbon dioxide concentration.
The carbon dioxide concentration control system is based on information such as the crop type input by the user through the panel, the crop sowing date, and the like. The SCM calculated the carbon dioxide concentration control scheme according to the crop variety, the crop growth period, the current season, the temperature in the greenhouse, and the illuminance, and added two proportional liquids through a dilute sulfuric acid feeder and an ammonium bicarbonate feeder. Chemical reaction produces carbon dioxide gas, which diffuses carbon dioxide gas into the greenhouse under the action of a blower. When the concentration of carbon dioxide reaches the specified value, the reaction is stopped, and the solenoid valve is controlled to let go of the remaining material of the reaction and prepare for the next reaction.
The success or failure of the carbon dioxide monitor control system depends to a large extent on the accuracy and completeness of the database related to crop growth and carbon dioxide concentration. China has a vast area and a wide range of climatic conditions. The same control software is not universal. Therefore, it needs a lot of applications and improvements to be more complete and practical.