Ceylon: Mahaweli Ganga irrigation and hydro/power survey, vol 8, agricultural economics, part A, first stage of the survey

air temperature arroz budget budgets climatologia climatologie climatology conduite de la culture cost benefit analysis crop management crop rotation cultivated land cultural methods exploitation agricole explotaciones agrarias farm income farm management farm size farms gestion de l'exploitation agricole humedad humidity land classification land suitability land use manejo de fincas manejo del cultivo methode methods mode de culture population density population rurale precipitation presupuesto production production possibilities rendement rendimiento revenu de l'exploitation rice riz rural population soil types taille de l'exploitation agricole temperatura del aire tenencia tenure tierras cultivadas tipos de suelos type de sol utilisation des terres yields