V.B. UPADHYAY and S.K. VISHWAKARMA 2001. Long-term effect of integrated nutrient management in rice (Oryza sativa)wheat (Triticum aestivum) cropping system. Indian Journal of Agronomy. 59, 2 (Oct. 2001), 209–214. DOI:https://doi.org/10.59797/ija.v59i2.4566.