241-7 Using a Nitrification Inhibitor in Maintaining Wheat Grain Protein Under Elevated CO2.
Tuesday, October 24, 2017: 2:40 PM
Marriott Tampa Waterside, Room 4
Atmospheric carbon dioxide (CO2) concentration has been increasing since the industrial revolution. Elevated CO2 generally reduces wheat grain protein but increases nitrous oxide (N2O) emission from cropping systems. While the suppression of nitrate (NO3–) photoassimilation under elevated [CO2] may explain the reduction of protein, the manipulation of the form of soil mineral N source (NO3– vs. ammonium (NH4+)) has the potential of improving grain protein. The aims of this research were to investigate whether N management (the use of nitrification inhibitors) can (i) improve grain protein concentration and fertiliser N recovery under future CO2 concentration, and (ii) counteract the potential positive effect of elevated CO2 on N2O emission. The research was undertaken at the free-air CO2 enrichment (FACE) in Australia. Preliminary results suggested that the nitrification inhibitor has the potential to reduce N2O emission under elevated CO2 and maintain grain protein. The findings provide implications for food security, grain industry and the environment.