An environment management system in a plant cultivation facility used for a cultivation facility that can control the inside of the plant cultivation facility to an appropriate humidity with a simple configuration. SOLUTION: A heating machine that is installed in a plant cultivation facility and that heats the cultivation facility by a combustion process when heating in the cultivation facility is required, and a dehumidifier that dehumidifies exhaust gas generated by the combustion process When the carbon dioxide recovery operation is performed to recover carbon dioxide from the dehumidified exhaust gas when the combustion process is being performed by the warmer, and the supply of carbon dioxide is required in the cultivation facility, A carbon dioxide recovery and supply device that performs a carbon dioxide supply operation to be supplied into the cultivation facility, a humidity sensor that measures humidity in the cultivation facility, and a humidity sensor when the carbon dioxide recovery operation and the carbon dioxide supply operation are not performed When the humidity in the cultivation facility measured in (1) becomes equal to or higher than a predetermined value, a dehumidification control device that dehumidifies the air in the cultivation facility by a dehumidifier is provided. [Selection] Figure 1【課題】簡易な構成で、植物の栽培施設内を適切な湿度に制御することが可能な、栽培施設に用いる植物の栽培施設内の環境管理システムを提供する。【解決手段】植物の栽培施設内に設置され、栽培施設内の加温が必要なときに燃焼処理により栽培施設内を加温する加温機と、燃焼処理で発生した排ガスを除湿する除湿器と、加温機で燃焼処理が行われているときに除湿された排ガスから二酸化炭素を回収する二酸化炭素回収運転を行い、栽培施設内に二酸化炭素の供給が必要になると、回収した二酸化炭素を栽培施設内に供給する二酸化炭素供給運転を行う二酸化炭素回収供給装置と、栽培施設内の湿度を計測する湿度センサと、二酸化炭素回収運転および二酸化炭素供給運転が行われていないときに、湿度センサで計測された栽培施設内の湿度が所定値以上になると、除湿器により栽培施設内の空気の除湿を行う除湿制御装置とを備える。【選択図】図１
