7.Bio Farming
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Item 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.Item Selected notes on the manuring of tea(1982) Eden, T.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 Biological nitrogen fixation and crop production(Department of Agriculture:Peradeniya, 1988) Thirukkumaran, P.; Mudannayake, C.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 Growth and nitrogen fixation in Azolla pinnata under field conditions(National Science Council:Colombo, 1982) Kulasooriya, S.A.; Hirimburegama, W.K.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.