Effects of different water management practices and water use efficiency of some [yields of] cash crops grown on the latosols of the north western dry zone of Sri Lanka

agricultura comercial agriculture commerciale arid zones asia asie augmentation de rendement aumento del rendimiento breeding breeding aims cash crops clima climat climate climatic zones commercial farming condiciones ambientales condition de milieu cultivos comerciales culture de rapport environment environmental conditions environnement farming systems irrigation medio ambiente objetivo de mejoramiento riego site factors sri lanka water management zone aride zone climatique