A new cropping system strategy for the poorly irrigated rice lands of the dry zone [irrigation, rice cultivation, Sri Lanka]

agricultural chemicals agronomic characters arroz asia asie cereales cereals clima climat climate climatic zones condiciones ambientales condition de milieu cropping systems crops cultivation cultivo cultivos cultivos de grano economic plants engrais environment environmental conditions environnement fertilizers grain crops irrigation labranza medio ambiente methode methods plantas plante plante de culture plants pratique culturale productividad productivity produit agrochimique profitability rendement rendimiento rentabilidad rice riego riz sistemas de cultivo site factors sri lanka tillage travail du sol yields zone climatique zone semi-aride