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Distribution of phosphorus and potassium in selected rice cultivated soils and their accumulation in rice grains under farmer-managed field conditions in Sri Lanka
(NSF:Colombo, 2023-09) Suriyagoda, L.D.B.; Neththasinghe, N.A.S.A.; Chandrasekara, E.D.C.T.; Ekanayake, E.M.S.; Dissanayaka, D.M.S.B.; Ariyarathne, M.; Marambe, B.
Nitrogen use and economics of intercropping in Sri Lanka
(National Science Council:Colombo, 1981) Gunasena, H.P.M.
Optimum cropping pattern for Mahaweli system C
(Natural Resources Energy Science Authority of Sri Lanka:Colombo, 1988) Bogahawatte, C.; Jayasuriya, M.R.T.