1Graduate School of Agriculture, Hokkaido University;
Sapporo, 060-8589, Japan.2Research Faculty of Agriculture, Hokkaido University;
Sapporo, 060-8589, Japan.3Fukuda
Hydrologic Center; Sapporo, 001-0024, Japan.
*Corresponding author: Hitoshi
Araki
Email: arakih@agr.hokudai.ac.jp