Zia, M Sharif, M Salim, Arshad Ali, and Rahmat ullah. “?PRODUCTIVITY OF RICE-WHEAT SYSTEM IN RELATION TOAZOLLA GREEN MANURE FERTILIZED WITH NITROGEN AND PHOSPHORUS”. Biological Sciences - PJSIR 41, no. 1 (February 16, 1998): 32–35. Accessed July 3, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/2226.