7.Bio Farming

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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.
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.
Growth and nitrogen fixation in Azolla pinnata under field conditions
(National Science Council:Colombo, 1982) Kulasooriya, S.A.; Hirimburegama, W.K.
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.