PROBLEM TO BE SOLVED: To provide a light supplement system for reducing variations of growing conditions caused by weather and suppressing a supplemental light quantity by making an optical spectrum during the daytime except for in sunny weather closer to an optical spectrum during the daytime in sunny weather under cover culture.SOLUTION: A light supplement system (1) irradiates a plant covered by a covering material (400) with light in a predetermined wavelength region set beforehand in a wavelength region where light quantity during the daytime but not in sunny weather is smaller than during the daytime in sunny weather under covering with the covering material (400).COPYRIGHT: (C)2014,JPO&INPIT【課題】被覆栽培時に晴天時以外の日中の光スペクトルを晴天時の日中の光スペクトルに近づけることで、天候による栽培条件の振れ幅を小さくし、かつ、補光量を少なく抑える。【解決手段】補光システム(1)は、被覆資材(400)で被覆された植物に、被覆資材(400)による被覆下で、晴天時以外の日中に、晴天時の日中に対して光量が不足している波長領域における予め設定された所定の波長領域の光を照射する。【選択図】図3
