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Input use, productivity and efficiency of rice cultivation in the Kiridi Oya project area
(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1986) Hector kobbekaduwa Agrarian Research and Training Institute
Environmental and social contraints on paddy production under existing conditions:a case study in Hambantota District
(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1974) Izumi, K.; Ranatunga, A.S.; Hector Kobbekaduwa Agrarian Research and Training Institute
Profitability and resource characteristics of paddy farming
(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1977) Ranatunga, A.S.; Abeysekera, W.A.T.; Hector Kobbekaduwa Agrarian Research and Training Institute