The present invention ripe artificial firefly tree in the house if you want to and water supply and water management by arranging the shelves, as moisture is retained in the proper range, to provide a water supply amount detection table tends to Mizukagen. The A weight the vertical axis 7 Nitori artificial firefly tree, which celebrated its germination time ripe to mushroom, Nitori horizontal axis 8 harvest management period from the first day of the period said time until the day of harvest is finished, in harvest management period , the weight of the proper moisture content of artificial firefly tree expecting the maximum yield, it is the notation the graph line 2 can be seen every day that passes. .BACKGROUND【課題】ハウス内に完熟人工榾木を棚並べして給水し水管理する場合に、水分が適正範囲に保持されるように、水加減しやすくなる給水量検出表を提供する。【解決手段】完熟して茸の発芽時期を迎えた人工榾木の重量を縦軸7にとり、該時期の初日から収穫が終了する日までの収穫管理期間を横軸8にとり、収穫管理期間において、最大収穫量を見込む適正な含水量の人工榾木の重量を、経過する日ごとに分かるようにグラフ線2を表記してなる。【選択図】図1