title: Comparison greenhouse gas (GHG) emissions and global warming potential (GWP) effect of energy use in different wheat agroecosystems in Iran.
abstract: The aims of this study were to determine energy requirement and global warming potential (GWP) in low and high input wheat production systems in western of Iran. For this purpose, data were collected from 120 wheat farms applying questionnaires via face-to-face interviews. Results showed that total energy input and output were 60,000 and 180,000 MJ ha(-1) in high input systems and 14,000 and 56,000 MJ ha(-1) in low input wheat production systems, respectively. The highest share of total input energy in high input systems recorded for electricity power, N fertilizer, and diesel fuel with 36, 18, and 13 %, respectively, while the highest share of input energy in low input systems observed for N fertilizer, diesel fuel, and seed with 32, 31, and 27 %. Energy use efficiency in high input systems (3.03) was lower than of low input systems (3.94). Total CO2, N2O, and CH4 emissions in high input systems were 1981.25, 31.18, and 1.87 kg ha(-1), respectively. These amounts were 699.88, 0.02, and 0.96 kg ha(-1) in low input systems. In high input wheat production systems, total GWP was 11686.63 kg CO2eq ha(-1) wheat. This amount was 725.89 kg CO2eq ha(-1) in low input systems. The results show that 1 ha of high input system will produce greenhouse effect 17 times of low input systems. So, high input production systems need to have an efficient and sustainable management for reducing environmental crises such as change climate.
authors.affiliation: Department of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran. m.y6126@yahoo.com.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Yousefi
authors.affiliation: Department of Agroecology, Environmental Sciences Research Institute, Shahid Beheshti University, Tehran, Iran.
authors.forename: Abdolmajid
authors.initials: A
authors.lastname: Mahdavi Damghani
authors.affiliation: Department of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran.
authors.forename: Mahmud
authors.initials: M
authors.lastname: Khoramivafa
mesh_terms: D000383:Agriculture / Q000379:methods*; D000393:Air Pollutants / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D004560:Electricity; D005308:Fertilizers; D005742:Gasoline; D057232:Global Warming; D017752:Greenhouse Effect; D007492:Iran; D008697:Methane / Q000032:analysis; D009584:Nitrogen; D009609:Nitrous Oxide / Q000032:analysis; D014908:Triticum
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D005742:Gasoline; D002245:Carbon Dioxide; D009609:Nitrous Oxide; D009584:Nitrogen; D008697:Methane
keywords: Energy requirement; Global warming potential; Greenhouse gas emissions; Wheat