Abstract
One of the most important sources of greenhouse gas emissions resulting from human activities is agricultural activities. Many factors such as tillage, fertilizer use, irrigation, soil properties, etc. can affect greenhouse gas emissions. However, their effects on greenhouse gas emissions are still among the important research topics today. In this study, the effects of different irrigation levels on CO2, CH4, N2O emission in soil were investigated in silage maize irrigated with drip irrigation system. The study was carried out for two years, 4 different irrigation levels (S1:100%, S2:70%, S3:40%, S4:0) were applied. ADA 9516 silage mazie variety was used as the test plant. Static cylinders were used in each plot for greenhouse gas measurements. Greenhouse gas Cylinders (cells) consisting of 2 pieces made of PVC placed on trial plots were used in the research. Gas samples were analyzed with gas chromatograph (Agilent GC 7890A) and gas emission values of CO2, CH4 and N2O were calculated. In the study, the highest cumulative CO2 emission values by years were obtained for S1 with 1470.4 and 1129.6 kg ha−1, respectively (p<0.01) and the CO2 emission values measured after irrigation were found to be higher than the pre-irrigation emission values. The highest cumulative N2O emission values were obtained for S1 with 0.54 and 0.50 kg ha−1, respectively, over the years (p<0.001), N2O emission values were higher after irrigation. In CH4 analyzes, it was determined that the trial area soil behaved as a CH4 sink. The highest cumulative CH4 uptake in both years of the study occurred in S1 with -1.79 and -3.17 kg ha−1, respectively (p<0.01). Similarity was observed in CH4 flux values before and after irrigation. In the research, it was determined that irrigation practices increased greenhouse gas emission statistically. On the other hand, it has been determined that producing with irrigation using less agricultural land can help reduce greenhouse gas emissions.
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