Risk analysis of a rainfed rice production system in Tarlac, Central Luzon, Philippines

abonos nitrogenados agriculteur agricultores arroz conduite de la culture crop management crop yield farm management farmers filipinas gestion de l'exploitation agricole income manejo de fincas manejo del cultivo nitrogen fertilizers oryza sativa philippines rendement des cultures rendimiento de cultivos renta revenu rice riesgo risk risk assessment risk reduction risque riz