Kumar, Manoj, S P Trehan, S. K. Singh, and S. N. Singh. 2013. “GROWTH-PERIOD SPECIFIC NITROGEN REQUIREMENT OF POTATO IN THE INDO-GANGETIC PLAINS OF BIHAR”. Potato Journal 33 (3 - 4). https://epubs.icar.org.in/index.php/PotatoJ/article/view/33236.