L. N. VERMA and A. K. RAWAT, “Low grade rockphosphate:A complimentary phosphorus source in soybean (Glycine max)-wheat (Triticum aestivum) cropping system*”, Indian J Agri Sci, vol. 69, no. 4, Jan. 2013, Accessed: Oct. 26, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAgS/article/view/26708