MANN, K. K., BRAR, B. S., & DHILLON, N. S. (2011). Influence of long-term use of farmyard manure and inorganic fertilizers on nutrient availabiIity in a Typic Ustochrept. The Indian Journal of Agricultural Sciences, 76(8). https://epubs.icar.org.in/index.php/IJAgS/article/view/3036