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Title: THE SOIL ORGANIC POOL FOR DIFFERENT LAND USE AND AGRICULTURAL LMANAGEMENT SYSTEMS IN NORTH APPALACHIAN EXPERIMENTAL WATERSHED

Author
item HAO, Y - OHIO STATE UNIVERSITY
item LAL, R - OHIO STATE UNIVERSITY
item Owens, Lloyd
item IZAURRALDE, C - PACIFIC NW NATIONAL LAB
item POST, W - OAK RIDGE NATIONAL LAB

Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: 1/17/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Land use and agricultural management systems strongly impact the soil organic carbon (SOC) pool. At the North Appalachian Experimental Watershed research station near Coshocton, OH, several land uses and agricultural management practices have been maintained from 1939 to 1999. A native forest (mixed oaks) SOC pool was 73 Mg/ha to 30 cm depth. SOC pools in 4 pastures established in 1939 ranged from 45 to 48 Mg/ha to 30 cm depth in 1998. SOC pools in the 3 pastures established from 1972 to 1975 ranged from 41 to 61 Mg/ha to 30 cm depth in 1998. The SOC pool in a 25-year old meadow established in 1974 for hay production was 42 Mg/ha to 30 cm depth. Other land use included moldboard tillage corn-wheat-meadow-meadow rotation (MTR) with prevailing farming (MTRP, straight row, 56 kg/ha 5-20-20 fertilizer, 4.5 Mg/ha cattle manure, liming to pH 5.4) or improved farming (MTRI, contour row, 225 kg/ha 5-20-20 fertilizer, 6.7 Mg/ha manure, liming to pH 6,8). SOC pools in 1970 ranged from 29 to 46 Mg/ha to 30 cm depth. On average, the SOC pool was 24 Mg/ha higher in the MTRI than in MTRP to 30 cm depth. The SOC pool in moldboard tillage continuous corn (MTC) from 1984 to 1998 (15 years) was 33 Mg/ha to 30 cm depth. In comparison with MTR, the SOC pool to 30 cm depth was 5 to 10 Mg/ha greater in watersheds with 15 years of paraplowing (PTR, 50 cm depth) and no tillage(NTR) for corn-soybean rotation, but was 5 to 10 Mg/ha lower in a corn-soybean rotation (CTR). The SOC pools in no tillage continuous corn (NTR) for 36 and 30 years were similar without cattle manure (30-year NTC) but was 21 Mg/ha higher to 30 cm depth with application of 6 to 11 Mg/ha cattle manure. Adoption of recommended practices have a potential to enhance the SOC pool.