About NAKATSU SATOSHI
About 北海道十勝農試
About TAMURA HAJIME
About 北海道十勝農試
About 日本土壌肥料学雑誌
About organic fertilization
About compost
About crop residue
About soil component
About Carbon
About kuroboku soil
About Nitrogen
About bulk density
About soil aggregate
About Glycine max
About spring seeding wheat
About potato
About Beta vulgaris var.rapa
About rotation cropping
About Fertilizer application and efficiency
About Field crops in general
About 有機物
About 牛ふん
About バーク堆肥
About 収穫
About 残さ
About 北海道
About 淡色
About 黒ボク土
About 全炭素
About 全窒素
About 物理