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Competitive performance of purple nutsedge (Cyperus rotundus L.) and onion (Allium cepa L.) as affected by different sources of Nitrogen
(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2012) Geretharan, T.; Sangakkara, U.R.; Arulnandhy, V.
Lysimetric studies on N-losses under different fertilizer management systems
(National Agricultural Society of Sri Lanka:Peradeniya, 1988) Premaratne, K.P.; Gunasena, H.P.M.
Deep placement:a method of nitrogen fertilizer application compatible with algal nitrogen fixation in wetland rice soils
(1980) Roger, P.A.; Kulasooriya, S.A.; Tirol, A.C.; Craswell, E.T.
Nitrogen fixation in some rice soils in Sri Lanka
(Oxford University Press, 1987) Granhall, U.; Kulasooriya, S.A.; Hirimburegama, W.K.; De Silva, R.S.Y.; Lindberg, T.