Increased yields and incomes from improved fertilizer management practices at the Katupotha Cropping Systems Project [rice, Sri Lanka]

agricultural chemicals arroz asia asie augmentation de rendement aumento del rendimiento breeding breeding aims cereales cereals crops cultivos cultivos de grano economic plants engrais fertilizers grain crops income ingresos objetivo de mejoramiento plantas plante plante de culture plants produit agrochimique revenu rice riz sri lanka