Thermal image utilization on the vigor diagnosis of mandarin orange tree

In this study, first of all, it was made that the emissivity of the mandarin orange leaf was obtained in the laboratory, and then thermal image of mandarin orange tree was acquired in the orange grove by the "Thermoshot." The purpose of this study is to clarify the possibility of tree vigor measurement of mandarin orange using thermal image. The thermal images of two leaves were taken by Thermoshot. Each tree vigor is different one another. In the case of leaf of which tree vigor is weak, it was shown that the temperature was high at the central part and low in the peripheral part. On the other hand, in the case of leaf of which tree vigor is strong, the tendency was quite opposite, that is, the temperature was low at the central part and high in the peripheral part.