Greenhouse Gas Emissions From Cotton and Grain Sorghum Cropping Systems Under Different Nitrogen and Tillage Treatments.

Globally agriculture accounts for more than 10% of anthropogenic greenhouse gas (GHG) emissions. According to the United Nations’ Intergovernmental Panel on Climate Change (IPCC), agricultural activities are responsible for 21-25% of all anthropogenic CO₂ fluxes, 50% of total CH₄ emissions, and 60% of total N₂O fluxes. Different cropping and tillage management practices have the potential to alter atmospheric CO₂, N₂O, and CH₄ concentrations. The atmospheric emission of N₂O is related to N fertilizer use in cropping systems. This study was conducted in the Texas Rolling Plains and aims to compare the greenhouse gas fluxes from cotton and grain sorghum under different management practices. The GHG emission trends in response to fertilizer N application will also be reported. Small flux chambers were used to measure GHG fluxes from soil at fixed time intervals. The concentrations of GHG were determined by gas chromatography.