Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/3/2006
Publication Date: 5/3/2006
Citation: Follett, R.F., Del Grosso, S.J., Wallace, J., Kimble, J. 2006. Effect of crop rotation, tillage, and soil series on soil organic carbon sequestration. American Society of Agronomy Abstracts. Interpretive Summary:
Technical Abstract: Farm fields in eastern Virginia with corn-soybean and corn-small grain-soybean rotations from multiple farms were sampled to depths of 0-10 and 10-20 cm to measure soil organic carbon (SOC) sequestration for ‘complete no-till’ (no-till) vs. ‘conventional-till’ (conv-till) (tillage prior to small grain). Cropping sequences include combinations of corn, small grain, and soybean for 3 coarse-textured soils. Soil samples were analyzed for SOC and soil bulk density. Extensive prior information (past 5 years) on crop rotations, nutrients applied, tillage, and crop yields were collected for each field. Tillage significantly affected SOC in the 0-10 and in the 0-20 cm depth increments. Soil series was different in the 10-20 cm depth increment and there was a soil by depth interaction when both depths were considered. Importantly, the data collected allow the ‘DAYCENT’ computer model to be calibrated to these soils. Corresponding weather records were obtained for the same 5-year period from the Richmond climate station and model simulations were run for each field. Use of the DAYCENT model provides a practical method to project rates of SOC sequestration and N2O emissions into the future under no-till and conv-till systems. DAYCENT can also provide information that may be useful should carbon (C) trading or C markets develop for agricultural producers. A SOC increase is projected for each of the soil series with that for the Alta Vista being the largest. SOC sequestration increased for both no-till and conv-till to 10 years but the increase was larger for no-till.