?PRODUCTIVITY OF RICE-WHEAT SYSTEM IN RELATION TOAZOLLA GREEN MANURE FERTILIZED WITH NITROGEN AND PHOSPHORUS. Pakistan Journal of Scientific & Industrial Research [Internet]. 1998 Feb. 16 [cited 2026 Apr. 25];41(1):32-5. Available from: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/2226