PROBLEM TO BE SOLVED: To provide plant cultivation methods in a plant factory, the methods being able to optimize culture efficiency by improving plant cultivation efficiency and reducing costs for plant cultivation.SOLUTION: The light period and the dark period of artificial lighting for plant cultivation are controlled so as to be periodically repeated, and a plant factory configured to be supplied with carbon dioxide for plant growth promotion has an opening portion at a higher position than a plant cultivation plane in some cultivation chamber wall so that the outside air of the cultivation chamber can ventilate. The plant factory is also configured to obtain carbon dioxide by burning hydrocarbon and to show periodical sawtooth waveform of the concentration of carbon dioxide in the cultivation chamber corresponding to the light-dark period of the artificial lighting, by supplying the combustion gas at a constant speed, being characterized in that the length of a light period of the artificial lighting is set shorter than the length of a dark period.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】植物の栽培効率を向上させると共に植物栽培のための経費を低減させて、栽培効率を最適化し得る植物工場における植物培方法を提供する。【解決手段】植物育成用の人工照明の明期と暗期とが周期的に繰り返されるように制御され、かつ植物成長促進用の二酸化炭素が供給されるようになされた植物工場において、栽培室壁の一部に栽培平面よりも高い位置に開口部を有して栽培室外気と流通できるようになされてあり、また二酸化炭素は炭化水素の燃焼によって得られ、燃焼ガスを一定の速度で供給することにより栽培室内の二酸化炭素濃度が人工照明の明期暗期に対応する周期的鋸歯状波形を示すようになされてあり、このさい人工照明の明期時間長は暗期時間長よりも短く設定されることを特徴とする。【選択図】図2
