PROBLEM TO BE SOLVED: To provide techniques for utilizing in the efficient mass production of cutting seedlings of forest trees by an efficient and accurate method which are not methods by the management of a rooting confirmation based on a visual observation or a producer's experience or intuition.SOLUTION: A method for determining the rooting of a plurality of cutting seedlings of forest trees during raising seedlings is a method for determining the rooting of the plurality of cutting seedlings of forest trees during raising seedlings by the change in the tendency of fluctuation in the transpiration amount of a particular plurality of cutting seedlings among the plurality of cutting seedlings.SELECTED DRAWING: Figure 1【課題】発根の確認を目視や生産者の経験あるいは勘に基づく管理による方法ではない、効率的でかつ正確な方法で行うことにより、山林樹木の挿し木苗の効率的な大量生産に資する技術を提供する。【解決手段】育苗中の山林樹木の複数の挿し木苗が発根したことを判定する方法であって、前記複数の挿し木苗のうちの特定の複数の挿し木苗の蒸散量の変動の傾向の変化から、前記育苗中の山林樹木の前記複数の挿し木苗が発根したと判定する、方法である。【選択図】図１
