Local literature
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Item Biological N2 fixing capacity of Gliricidia sepium and Calliandra calothyrsus under different agroclimatic conditions(University of Ruhuna, Faculty of Agriculture:Kamburupitiya, 2000) Gunaratne, W.D.L.; Heenkenda, A.P.; Premakumara, K.V.S.; Bandara, W.M.S.R.Item Biofertilizers and their application(Eastern University:Chenkalady, 1999) Bagyaraj, D.J.; Suvarna, C.V.Item Effect of associative nitrogen fixing and phosphate solubilising bioagents on growth, yield and quality of sugarcane(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2000) Shankaraiah, C.; Hunsigi, G.Item 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.Item Nitrogen fixation in rice fields(2005) Kulasooriya, S.A.Item Azolla as a biofertilizer for rice in Sri Lanka(Martiness Nijhoff and W. Junk Publishers:Leiden, 1984) Kulasooriya, S.A.; Hirimburegama, W.K.; Abeysekera, S.W.Item Survival and effect of Azorhizobium caulinodans on rice roots(1993) Van Holm, L.H.J.; Van Nieuwenhove , C.; Kumari, I.A.D.C.T.; Kulasooriya, S.A.; Vlassak, K.Item Cyanobacteria and Azolla as biofertilizer for rice(Oxford and IBH Publ.:New Delhi and Calcutta, 1996) Kulasooriya, S.A.Item 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.Item Eco-friendly technologies for sustainable plantation agriculture(National Institute of Plantation Management:Athurugiriya, 2007) Yogaratnam, N.