3. Results and discussion
3.1. Grain protein
In the 2008 growing season, grain protein concentration was
15.3% under [aCO2] and 13.4% at [eCO2] showing a 12.4% reduction
of grain protein concentration at [eCO2]. In 2009, grain protein concentration
was 15.5% at [aCO2] and 13.5% at [eCO2], indicating an
almost similar reduction of grain protein at [eCO2]. Reduction in
grain protein concentration at [eCO2] has been reported elsewhere,
particularly under high temperate irrigated cropping systems
(Högy et al., 2009; Kimball et al., 2001).