A field study was carried out during summer seasons of 2018 and 2019 at the Experimental Farm Faculty Environmental Agricultural Sciences, Arish University, El-Arish, North Sinai Governorate. Egypt, This aimed to investigate response three sunflower genotypes (Helianthus annus L., i.e. Giza-102, Sakha-53, Line 120 nitrogen levels N1=15, N2= 30, N3= 45 kg N fed-1to maximize seed oil yields crop ...