Ramesh, P., Panwar, N. R., Singh, A. B., & Ramana, S. (2008). Effect of organic manures on productivity, soil fertility and economics of soybean (Glycine max) - durum wheat (Titicum durum) cropping system under organic farming in Vertisols. The Indian Journal of Agricultural Sciences, 78(12). https://epubs.icar.org.in/index.php/IJAgS/article/view/9973