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Impact of Nitrogen Fertilization and Cropping System on Carbon Sequestration in Midwestern Mollisols

^a Dep. of Natural Resource Ecology & Management, Iowa State Univ., Ames IA 50011
^b USDA-ARS, National Soil Tilth Lab., Ames IA 50011
^c Dep. of Agronomy, Iowa State Univ., Ames IA 50011

View larger version (20K): [in a new window]   Fig. 1. Average soil organic C concentrations, C/N ratio, and bulk density, 0–100 cm at two long-term cropping system experiments conducted in north central (Kanawha) and northeast (Nashua) Iowa, and a native undisturbed prairie site located 50 km from the Nashua cropping system experiment. Data for soil inorganic C (SIC, g kg–1) are for Kanawha, the only site with measurable concentration of carbonates.