Amin, M., Razzaq, A., Ullah, R., & Ramzan, M. (2006). EFFECT OF PLANTING METHODS, SEED DENSITY AND NITROGEN PHOSPHORUS (NP) FERTILIZER LEVELS ON SWEET CORN (Zea mays L.). Journal of Research (Science), 17(2), Pages: 83-89. http://jorscience.com/index.php/JRS/article/view/235