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water resource board the national water supply & drainage board mahaweli authority irrigation department international water management institute dairy india dairy indian dairy industry gps yield mapping geographic information system sigatoka disease banana disease private sector pension scheme private sector pension fund act problems and suggestions economics banks matara ergonomics waste managemnet environment pollution land disposal safety land disposal methods indigenous language of paddy culture in sri lanka paddy field based language kamath basa paddy language integration carbon foot print hybrid energy systems cfp solar electricity electricity usage hes