“?EFFECTS OF UREA, AZOLLA AND SESBANIA INCORPORATION ON THE CONCENTRA- TION AND UPTAKE OF N, P, K AND S IN RICE (ORYZA SATIVA)”. Biological Sciences - PJSIR 42, no. 3 (June 21, 1999): 145–149. Accessed March 10, 2026. https://v2.pjsir.org/index.php/biological-sciences/article/view/2137.