Gunapala, N.Amarasiri, S.L.2020-09-022020-09-021989Tropical Agriculturist, 145:p.61-74https://dl-doa.nsf.gov.lk/handle/1/2686ORGANIC FERTILIZERC/N ratioNatural pesticidesOrganic fertilizersRenewable resourcesGreen manuring of rice fields in the central region of Sri LankaArticle