N. K. Jain and A. K. Dhama, “Residual effect of phosphorus and zinc on yield, nutrient content and uptake and economics of pearlmillet (Pennisetum glaucum)-wheat (Triticum aestivum) cropping system*”, Indian J Agri Sci, vol. 75, no. 5, May 2005, Accessed: Oct. 27, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/9354