EFFECTS OF IRRIGATION INTERVALS AND NITROGEN LEVELS ON PHYSIOLOGICAL GROWTH PARAMETERS OF RICE (Oryza sativa L.) VARIETIES IN DADIN KOWA, NORTHERN NIGERIA - MUSTAPHA , Y.; GUNGULA , D. T.; MUSTAPHA, A. B.; MANU, I. (The Faculty of Agriculture Obafemi Awolowo University, Ile-Ife, Nigeria., 2020)