Abeyratne, F.Gunasena, H.P.M.Tennakoon, D.Agrarian Research and Training Institute2014-07-172014-07-171986https://dl-harti.nsf.gov.lk//handle/1/1895vi, 148p.Farming systemsSri LankaShifting farming:towards stability, a study of four rainfed farming systems in Sri Lanka