This research was conducted during spring and fall seasons, 2015 , at the fields of Field Crop Department – College of Agriculture –University of Baghdad . The objective was to evaluate the impact of corn grain moisture at harvesting of original population  to some agronomic traits  in subsequent generation of the variety 5018. In spring season 2015 , a seeds population  of this variety were  planted. When the  moisture of ear grains was go to the first treatment (37-42%) , ten ears were harvested . Ear harvesting dates were performed manually when the grains had 37-42% , 34-36% , 30-33% , 25- 28% and 19-22%  moisture content . Ten ears were harvested from each treatment . In fall season  2015 , varietal trail was carried out to the five treatment materials , using Randomized Complete Bock Design , with four replicates . The results were revealed significant differences among treatments in  number of days from planting to maturity , crop growth rate. g. plant .day ^-1 , crop growth rate . g .m². day ^-1 and grain yield kg. m^-2 . The highest grain yield ( 1.07 kg. m^-2 ), was produced from plant seeds , which harvested with moisture (19-22)% .It can be concluded the best harvesting  moisture to produce  seeds for plating in subsequent generation was ( 19-22 )%  .