A Study was carried out to investigate the impact of split application of nitrogen fertilizer, flag leaf and leaf under ear removal on grain yield and its components in corn (Zea mays L.). The study included a field experiment in two locations for autumn season 2014. First location was in Mosul city, while the second was in Al-Namrood (30 Km southern from Mosul). The split plot arrangement in Randomized Complete Block Design (R.C.B.D) with three replications was uased. The split application of nitrogen fertilizer treatment, flag leaf and leaf under ear removal treatment represented as Main plots and sub plots respectively. The experiment included five level of splitting nitrogen fertilizer treatment which is: half of recommended level was added at sowing، half after 30 days ASD, one third of recommended level was added at sowing, one third after 30 days ASD and one third was applied 60 days ASD، one fourth of recommended level was added at sowing, half after 30 days from sowing and one fourth after 60 days from sowing، half of recommended level was added at sowing، one fourth applied 30 days ASD and one fourth after 60 days from sowing، one fourth of recommended level was added at sowing, one fourth after 30 days ASD and one half 60 days ASD. Four levels of flag leaf and leaf under ear removal treatment which is: no flag leaf and leaf under ear removal, flag leaf removal, leaf under ear removal، removing flag leaf and leaf under ear. Gave the split application of nitrogen fertilizer third treatment higher rate significantly to number of ears per plant, number of grain per cob,500-grain weight (g), cobs yield (ton.ha-1), cob yield (ton.ha-1), grain yield per plant (g) and grain yield per area (ton.ha-1), in both locations. Achieved flag leaf removal treatment, removing flag leaf and leaf under ear treatment lower rate significantly to 500-grain weight (g), cob yield (ton.ha-1), grain yield per plant (g) and grain yield per area (ton.ha-1)، in two locations.