2019-01-312019-01-311998p.242-247. In: Ranaweera, N.F.C. ; Gunasena, H.P.M. ; Senanayake, Y.D.A. (eds.) Changing agricultural opportunities: the role of farming systems approaches. Proceedings of the 14th International Symposium on Sustainable Farming Systems.https://hdl.handle.net/20.500.12348/2511Concept of sustainability in relation to agricultural systems is discussed.application/pdfBook Chapter