PROBLEM TO BE SOLVED: To solve the problem that CO2 is conventionally applied using only a CO2 sensor to accelerate photosynthesis of cultivated crops in a facility, but the application of CO2 is started when the sensor senses a set value or less regardless of the temperature and ventilation amount of the facility, and applied CO2 flows out of the facility under the influence of material diffusion due to a concentration gradient with an increase in the ventilation amount of the facility along with a temperature rise, which results in difficulty in obtaining a high concentration CO2 environment in the facility, causes the application waste of CO2 and is unfavorable to the environment.SOLUTION: A newly employed temperature sensor determines the ventilation amount of the facility from temperature, and when the ventilation amount is low, CO2 can be applied to attain a high concentration environment. CO2 can be applied under environmentally-friendly and optimal environment conditions with the reduced application waste because of being uninfluenced by CO2 concentration in the facility only with the CO2 sensor and being hardly influenced by material diffusion due to the concentration gradient. An absolute photosynthetic speed is thereby increased to achieve an optimal growth environment for growth acceleration.COPYRIGHT: (C)2013,JPO&INPIT【課題】 従来の発明は、施設内栽培作物の光合成促進のためにCO2センサのみを用いてCO2を施用していた。施設の温度、換気量と関係なく設定値以下をセンサが感知するとCO2の施用を始める。温度の上昇と共に施設の換気量が大きくなればなるほど濃度勾配による物質拡散の影響で施用したCO2が施設外流出するため、施設内の高濃度CO2環境が困難であった。また、CO2施用の無駄も出ると共に環境にも良くない。【解決の手段】 新たに用いた温度センサが温度から施設の換気量を判断し、換気量の小さいときにCO2を施用できるため高濃度環境が可能。また、CO2センサのみによる施設内のCO2濃度の影響を受けず、濃度勾配による物質拡散の影響を受けにくいため、施用の無駄も減り、環境に優しく、最適環境条件下でCO2施用ができるので、純光合成速度を高め生育促進に最適な生育環境が可能である。【選択図】図1
