T.B. GHIMIRE and O.P.S. BANA 2001. Effect of fertility levels on mustard (Brassica juncea) seed yield, quality and economics under varying poplar (Populus deltoides) tree densities. Indian Journal of Agronomy. 56, 4 (Oct. 2001), 346–350. DOI:https://doi.org/10.59797/ija.v56i4.4699.