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Item A mulch roller for the management of cover-crops(Coconut Research Institute. Lunuwila, 1989) Fernando, A.M.A.Item A comparison of a slurry and a perfusion system to quantify potential and heterotrophic nitrification rates in soils(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1993) Fernando, A.M.A.; Giller, K.