Development of upland field [cropping system] in a mountainous district [Japan]: Engaged in own farming [rice, tobacco and Amorphophallus cultivation]

agricultura de regadio amorphophallus analisis analyse analysis araceae arroz arroz irrigado cereales cereals condiciones de trabajo condition de travail cropping systems crops cultivos cultivos de grano dicotiledoneas dicotyledons economic analysis economic plants ergonomia ergonomics ergonomie exploitation agricole explotaciones agropecuarias farming systems farms grain crops irrigated farming irrigated rice methode methods mixed farming monocarpos ornamentales monocotyledons nicotiana nicotiana tabacum ornamental monocarps ornamental plants plantas plantas estimulantes plantas ornamentales plante plante de culture plante ornementale plante ornementale monocarpique plante stimulante plants rice riz sistemas de cultivo solanaceae spathiflorae stimulant crops tubiflorae working conditions