Report of the meeting of the ad hoc working group on the problems of mechanization of rice production under wet paddy conditions - Peradeniya, Ceylon, 14-18 May 1958.

arroz costos costs cultural methods engineering equipment equipo farm equipment farm management gestion de l'exploitation agricole labour productivity manejo de fincas maquinaria de labranza mechanization mode de culture operating costs plant production productividad del trabajo rice riz tillage equipment