effects of tillage methods and irrigation on greenhouse gasses emission under wheat cultivation in the north of khuzestan

increasing the concentrations and emissions of greenhouse gases makes the weather warmer and affects land uses. carbon dioxide emission is recognized as one of the most important factors in global warming. the objectives of this research were to investigate the amount of co2 emission from soil to atmosphere during the wheat growth under two different tillage and irrigation methods. in this study, an experiment with a combination of tillage practices (conventional and conservation tillage) and two irrigation practices (flooding and furrow irrigation), using 45% surface residue, with 6 times of sampling from soil gases and 3 replications was done. the statistical design of split plot in time with covariance analysis was used. a closed chamber method and gas chromatography were applied at ramin agricultural university research station. in order to measure the amount of water used, the submerged siphon method was used. the results showed that, the overall carbon gas emissions were influenced by soil moisture and tillage systems. conventional tillage systems caused more fluxes because of mixing soils, the increase for co2, was 67%. the amount co2 gas emission for the flooding system was 33% more than of that furrow irrigation. conservation tillage with furrow irrigation produced the lowest (p≤0.05) carbon dioxide emission. this value was 1143 mg/ m3 whereas the conventional tillage-flood irrigation, with an average of 2592 mg/m3 showed the maximum (p≤0.05) emission.