B. BISWAS, and R. PODDAR. “YIELD AND NUTRIENTS UPTAKE OF SUNFLOWER (HELIANTHUS ANNUUS L.) AS INFLUENCED BY DIFFERENT LEVEL OF NITROGEN AND SULPHUR”. The Bioscan, vol. 10, no. Supplement 1, Feb. 2015, pp. 439-44, https://thebioscan.com/index.php/pub/article/view/1540.