Abstract

Factorial experiment was carried out in two sites (north of Dhi Qar Governorate) in Al-Dawaya and Al-Shatra, 45 km for each other in summer season (2017) to study the response of sweet corn (which was planted in first time in south of Iraq) to three planting dates (1/8, 15/8 and 1/9) and four treatments of additional (40 kg/ha) N fertilizer (without N, all at 8 or 12 leaf stage and separated at 8+12 leaf stages). Randomized Complete Block Design was used with three replications. The results could be summarized as follows: Planting dates caused a significant effect on sweet corn yield components and (15 August) showed the highest values of ear rows number (11.90 and 13.58), row grains number (31.05 and 31.58), ear grains number (367.3 and 421.2), grain yield (6, 317 and 6, 047 t/ha) in both the sites, respectively, compared to 1 August. Additional N fertilization caused significant effect on yield traits and the separated treatment (8 and 12) gave the highest ear rows number (13.40 and 12.03), row grains number (31.28 and 31.83), ear grains number (430.6 and 374.8) and grain yield (6.269 and 5.989 t/ha) for both the sites, respectively, compared to control treatment (without additional N fertilization).