1. Department of Agribusiness, Faculty of Agriculture, University of Jember, Jember 68121, Indonesia
2. Department of Agricultural Extension, Faculty of Agriculture, University of Jember, Jember 68121, Indonesia
3. Department of Sustainable Agriculture, Rakuno Gakuen University, Ebetsu 069-8501, Hokkaido, Japan
4. Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Hokkaido, Japan