SINGH, V. K., & KUMAR, V. (2013). Delineation of sulphur deficiencies in Trans-Gangetic Plain and on-farm sulphur management for higher productivity and profits in rice (Oryza sativa)-wheat (Triticum aestivum) system. The Indian Journal of Agricultural Sciences, 83(12). https://epubs.icar.org.in/index.php/IJAgS/article/view/35956