Effect of Organic Fertilizers and Cropping Systems on Carbon Sequestration Performance (Case study of Tabriz plain)

Climate change is a major threat to sustainable development and food security due to the impact of greenhouse gases of the Earth's atmosphere, especially in arid and semi-arid regions of the world such as Iran. Carbon sequestration in soils and plant ecosystems is one way to overcome this problem. Organic carbon content in soil is three times higher than carbon in all plant tissues and twice as high as atmospheric carbon. In this study, the effects of crop production and manure and straw application on carbon sequestration were evaluated, based on some soil physical and chemical properties. Soil samples (n = 308 in total) were collected from the surface depth (0-30 cm). Soil properties such as soil texture, pH, electrical conductivity, organic carbon, bulk density, carbon sequestration and etc. were estimated. Data were analyzed using SPSS software. Descriptive statistics, mean, standard deviation, etc. were used to determine the distribution of specimens. Stepwise regression was used to present the model. Analysis of the results showed the significant relationship between carbon sequestration and all soil properties, except sand. Soil carbon sequestration in the third crop year (onion) increased from 4.84 to 5.68 kgm-2. In the onion crop grown in the third year after wheat, straw produced by organic fertilizer increased by 30% and organic fertilizer by 70%. Finally, carbon sequestration was mapped for both crops using locomotor data and Arc map software.