Socio-economic aspects of improvements in small scale production [plantation crop, Sri Lanka]

agricultura comercial agricultural structure agriculture commerciale agronomic characters asia asie cash crops commercial farming cultivos comerciales culture de rapport empresas enterprises entreprise facteur de production farm size farm structure farming systems income ingresos labour petite entreprise procesamiento processing production production factors productividad productivity profitability rendement rendimiento rentabilidad revenu sri lanka structure agricole structure d'exploitation agricole trabajo traitement travail yields