Zia, M. S., Salim, M., Ali, A., & ullah, R. (1998). ?PRODUCTIVITY OF RICE-WHEAT SYSTEM IN RELATION TOAZOLLA GREEN MANURE FERTILIZED WITH NITROGEN AND PHOSPHORUS. Biological Sciences - PJSIR, 41(1), 32–35. Retrieved from https://v2.pjsir.org/index.php/biological-sciences/article/view/2226