PARMAR, D K, and VINOD SHARMA. 2014. “Nitrogen Requirement of Single Hybrid Maize (Zea Mays) - Wheat (Triticum Aestivum) System under Rainfed Conditions”. The Indian Journal of Agricultural Sciences 71 (4). https://epubs.icar.org.in/index.php/IJAgS/article/view/39723.