Zia, M. S., Salim, M., Ali, A. and ullah, R. (1998) “?PRODUCTIVITY OF RICE-WHEAT SYSTEM IN RELATION TOAZOLLA GREEN MANURE FERTILIZED WITH NITROGEN AND PHOSPHORUS”, Biological Sciences - PJSIR, 41(1), pp. 32–35. Available at: https://v2.pjsir.org/index.php/biological-sciences/article/view/2226 (Accessed: 24 November 2024).