About Hirai Goh
About Tokachi Agricultural Experiment Station, Hokkaido Research Organization (HRO)
About Horticulture Journal
About cultivation by direct seeding
About Hokkaido
About cold region
About Allium cepa
About mulch
About mulching culture
About nonwoven fabric
About row
About feeding damage
About crop yield
About plant growth
About lodging
About subpolar zone
About onion maggot
About seed emergence
About soil temperature
About Vegetables
About Influence on plants
About 寒地
About 播種
About タマネギ
About Allium
About 出芽
About 成長
About 球根
About 収量
About 不織布
About 浮遊
About うね