Abstract
In this research, we examined the possibility of tree vigor diagnosis by hand-held chlorophyll fluorometer (following, FluorPen) through comparison with the existing measuring method aiming at establishment of the simpler and more objective tree vigor diagnostic technique. Photinia glabra Thunb. were divided into the irrigation treatment groups and the non-irrigation treatment groups, and FluorPen, MINI-PAM, a chlorophyll meter, and visual diagnosis compared the decline degree of tree vigor by water stress. As a result, there was a significant difference by all the measuring methods in the irrigation treatment and the non-irrigation treatment after the 7th day of the experiment start. Moreover, only night measurement of FluorPen had a significant difference between the irrigation treatment and the non-irrigation treatment as of the 4th day.
