Constraints and possible opportunities of sustainable agricultural production. A Case of Ukara Island, Mwanza, Tanzania

analyse statistique animal husbandry commercialisation conduite de la culture crop management crop yield cultivation cultivo farm inputs farm management farming systems ganado gestion de l'exploitation agricole hogares households insumos agricolas livestock manejo de fincas manejo del cultivo marketing mercadeo moyen de production agricole petite exploitation agricole pratique culturale recherche rendement des cultures rendimiento de cultivos research small farms sostenibilidad statistical analysis sustainability tanzania tanzanie