1. National Agric. Res. Center for Tohoku region
2. Aomori Pref. Industrial Technology Res. Center
3. Iwate Agric. Res. Center
4. Miyagi Pref. Furukawa Agric. Res. Center
5. Akita Pref. Agric. For. Fish. Res. Center
6. Fac. Agric., Yamagata Univ.
7. Fukushima Agricultural Technology Center
8. National Agirc. Res. Center for Hokkaido region
9. Fac. Agric., Iwate Univ.