Abstract
We experienced malfunctions in soil moisture sensors (10HS, ECH2O-TE and 5TE; Decagon Devices Inc.) and different range of output value of Em5 with Em5b and Em50, through column experiments. The per-centages of malfunctions were 17 %, 0 % and 30 % for 10HS, 5TE and ECH2O-TE sensor, respectively. The mal-function was decided that the output value was too high or low to calibrate with data logger which is assumed to work. Also, we found that the range of output value of Em5 data logger was different from that of Em5b and Em50. There-fore, it is needed to specific calibration when Em5 data logger is used with other data logger (Em5b, Em50).
