Bharathi, S., et al. “Productivity and Nitrogen Requirement of Maize (Zea Mays L.) in Rabi As Influenced by Kharif Cropping Practices”. International Journal of Bio-Resource and Stress Management, vol. 6, no. Aug, 4, Aug. 2015, pp. 447-51, https://ojs.pphouse.org/index.php/IJBSM/article/view/734.