Monday, 6 October 2008

George R. Brown Convention Center, Exhibit Hall E

Y. Raut, The Ohio State University South Centers, 1864 Shyville Road, Piketon, OH 45661, Irfan Aziz, Dept. of Agronomy, University of Arid Agriculture, Rawalpindi, Pakistan and Khandakar Islam, Ohio State University - OARDC, OSU South Centers, 1864 Shyville Rd, Piketon, OH 45661-9749

Management practices influencing soil organic matter quality responsible for carbon sequestration are still not very clear. A randomized block experiment in 2 (tillage) x 3 (crop rotation) factorial arrangement was laid-out to evaluate tillage and crop rotation impact (1990 to 2007) on organic matter quality at different soil depths. An untilled grassy was used as control. Tillage treatments (conventional tillage, CT and no-till, NT) were factored into continuous corn (CC), corn-soybean (CS), and corn–soybean-wheat-cowpeas (CSW) rotation. Soil cores were randomly collected at 0-7.5, 7.5-15, 15-22.5 and 22.5-30 cm depths, 2-mm sieved, air-dried, extracted humic substances with 0.5M NaOH (pH 13.4). The extracts were filtered, air-dried, and analyzed for functional group components by using Fourier Transformation Infrared (FTIR) Spectroscopy. Results showed that extracted humic substances were dominated by OH, C=C and C-C groups. In both NT and CT, the functional groups were dominated by OH and C=C for corn and corn-soybean rotation. Including wheat in the rotation under both NT and CT showed C-C peak. Likewise, humic substances extracted from grass land showed peaks of OH, C=C and C-C groups. However, continuous corn under NT showed only OH peak.

See more of: Nutrients and Soil Structure: II (includes Graduate Student Competition) (Posters)
See more of: S11 Soils & Environmental Quality

2008 Joint Annual Meeting (5-9 Oct. 2008): Tillage and Crop Rotation Impact on Soil Organic Matter Quality.

607-22 Tillage and Crop Rotation Impact on Soil Organic Matter Quality.