About UKAWA HIROKI
About 秋田県大 生物資源科学
About Zea mays
About case study
About agricultural management
About business management
About combine
About work time
About economy(efficiency)
About analysis of profitability
About furtherance
About forage crop
About large-scale management
About Agricultural economy,agricultural management
About Forage crops,pasture
About 子実
About トウモロコシ
About 可能性
About 展開
About 耕種
About 経営
About 大規模