KATKAR, R.N. et al. 2011. Long-term effect of fertilization on soil chemical and biological characteristics and productivity under sorghum (Sorghum bicolor)–wheat (Triticum aestivum) system in Vertisol. The Indian Journal of Agricultural Sciences. 81, 8 (Aug. 2011). DOI:https://doi.org/10.56093/ijas.v81i8.8437.