Jayasundara, H.P.S.Mathes, D.T.Liyanage, M de S.2014-06-032014-06-031989Annual Sessions of SLAAS, Sri Lanka. Colombo, 1989:p...https://dl-cri.nsf.gov.lk//handle/1/3345Farmng SystemsIntegrated farmingImpact of an integrated farming model on the productivity of lands