SUMANT KUMAR DIWAKAR, et al. “EFFECT OF FORMS OF ZINC AND LEVELS OF IRON ON GROWTH AND YIELD OF SUMMER MAIZE (Zea Mays L.)”. The Bioscan, vol. 16, no. 1, Jan. 2021, pp. 77-80, https://thebioscan.com/index.php/pub/article/view/413.