N.T.Q. THUAN and D.S. RANA 2001. Productivity and response of quality brassicas (Brassica sp.) cowpea (Vigna unguiculata) sequence under different sources of nutrients and sulphur levels. Indian Journal of Agronomy. 55, 4 (Oct. 2001), 264–269. DOI:https://doi.org/10.59797/ija.v55i4.4761.