Abstract
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 study the effect of grain moisture at harvesting on some agronomic traits of the corn next generation , by using synthetic variety 5018 . In spring season 2015 , seeds of this variety was planted ,when moisture of the ear grains was (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. In fall season 2015 , varietal trail was carried out to the five treatment materials , using Randomized Complete Bock Design , with four replicates. The results revealed , that non significant differences between treatments (19-22)% and (25-28)% , in all the studied traits . The plants grown from the seeds of (25-28)%, were produced highest vegetative mass (116.30 g.plant-1) , total dray matter (269 g. plant-1) and total dray matter ( 1.80 kg.m-2 ) . Highest grain yield ( 1.07 kg.m-2 ) and harvesting index ( 0.63) were produced from plants grown from seeds harvested with (19-22)% moisture content . It can be concluded that the best moisture contents of the grains for seed production was (19-28)%.
Highlights
The corn (Zea mays L.) grains moisture content at harvesting has great impact on seeds for second generation uses ( 1, 19 )
The corn grain yield and it's quality in fall season production in Iraq, can be guaranteed by early harvest, due to its less exposure to adverse environmental conditions, insect attack, fungus and exposure to un appropriate of climatic factors, such as early rainfall, highest humidity and lowest temperature, in addition, it provides better utilization of the production and processing infrastructure, even if the harvesting of immature seeds occur ( 3, 6, 11 ) corn grains harvested with high moisture content are more susceptible to mechanical damage caused mainly by machinery during harvest and husking ( 16, 20 )
The proper time to grains harvest is as close as possible to the physiological maturity point, where quality -ative and quantitative grain losses are at the minimum and the highest grain quality is obtained
Summary
The corn (Zea mays L.) grains moisture content at harvesting has great impact on seeds for second generation uses ( 1 , 19 ). The plants grown from the seeds of [25-28]%, were produced highest vegetative mass (116.30 g.plant-1) , total dray matter Highest grain yield ( 1.07 kg.m-2 ) and harvesting index ( 0.63) were produced from plants grown from seeds harvested with [19-22]% moisture content .
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