Intensification and responses of smallholder farmers to productivity decline in Northeastern Ethiopian highland: a case study from Tehulederie district

agriculteur agricultores analyse input output animal production comportamiento humano comportement humain cropping systems ethiopia etiopia facteur de rendement factores de rendimiento farm income farm inputs farm management farmers gestion de l'exploitation agricole hogares households human behaviour input output analysis insumos agricolas land diversion manejo de fincas mixed farming moyen de production agricole petite exploitation agricole plant production production animale retrait des terres revenu de l'exploitation sistemas de cultivo small farms yield factors