About KONDO KATSUNOBU
About YAMAMOTO YASUTAKA
About 北大 大学院農学研究院
About SHIN Yongkwang
About 韓国農村経済研究院
About 農林業問題研究
About Republic of Korea
About cultivation
About productivity analysis
About productivity
About economy(efficiency)
About statistical data
About worth
About rice crop
About scale merit
About Agricultural economy,agricultural management
About 規模
About 経済
About 韓国
About 稲作
About 生産性分析