PROBLEM TO BE SOLVED: To uniformly control the temperature of a plant root with a member which is cheaper and lighter than a cultivation container holding tray having a heat conducting part such as a metal foil. SOLUTION: The cultivation temperature control cover 4 is placed on the temperature control floor part 2 for controlling the temperature of a plant to be cultivated in the cultivation container, and the cultivation container can be inserted vertically through the cover. By being provided between the top plate portion 4a having the formed through hole 4c and the top plate portion 4a and the temperature control floor portion 2 so as to surround the through hole 4c when viewed from the through direction of the through hole 4c. It has a surrounding wall portion 4b that forms a temperature control space K between the top plate portion 4a and the temperature control floor portion 2. [Selection diagram] FIG.【課題】金属箔等の熱伝導部を有する栽培容器保持トレイよりも安価かつ軽量な部材によって、植物の根を均一に温度調整可能とする。【解決手段】栽培容器で栽培される植物の温調を行う温調床部２上に載置される栽培用温調カバー４であって、上下方向に貫通して栽培容器を挿し込み可能とされた貫通孔４ｃを有する天板部４ａと、天板部４ａと温調床部２との間に介挿されて貫通孔４ｃの貫通方向から見て貫通孔４ｃを囲って設けられることで天板部４ａと温調床部２との間に温調空間Ｋを形成する囲壁部４ｂとを有する。【選択図】図４
