[1]
“EFFECTS OF NITROGEN AND COPPER FERTILIZATION ON RICE YIELD AND FERTIL- IZER NITROGEN EFFICIENCY: A 15N TRACER STUDY”, Pakistan Journal of Scientific & Industrial Research, vol. 47, no. 1, pp. 50–55, Feb. 2004, Accessed: Mar. 18, 2026. [Online]. Available: http://www.v2.pjsir.org/index.php/biological-sciences/article/view/1457