PROBLEM TO BE SOLVED: To make it possible to determine the active state of Hevea brasiliensis without requiring experience or skill.SOLUTION: A active state determination method comprises a measurement step that measures the surface temperature of the trunk of Hevea brasiliensis and the ambient temperature around the trunk, and a determination step that determines the active state of Hevea brasiliensis on the basis of the measured surface temperature and ambient temperature.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】経験や熟練を必要とすることなくパラゴムノキの活動状態を判別可能とする。【解決手段】活動状態判別方法は、パラゴムノキの幹の表面温度と、前記幹の周囲の周囲温度とを測定する測定工程と、測定した表面温度と周囲温度とに基づいてパラゴムノキの活動状態を判別する判別工程とを有する。【選択図】図2
