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Item Conservation of residual Nitrate Nitrogen with winter cover crops(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1998) Fernando, M.F.S.W.; Mosley, A.R.; McMorran, J.P.; Clough, G.Item Potato management and cover crop effects on soil residual nitrate(Soil Science Society of Sri Lanka:Colombo, 1998) Fernando, M.S.W.; Mosely, A.R.; McMorran, J.P.; Clough, G.