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2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM

Paper No. 10
Presentation Time: 8:00 AM-6:00 PM

Tillage and Fertilizer Application Methods Effects on Greenhouse Gas Flux (CO2, CH4 and N2O)


WATTS, Dexter B.1, SMITH, Katy E.2, TORBERT, H. Allen1 and WAY, Thomas R.1, (1)Waste Management Research, USDA-ARS National Soil Dynamics Lab, 411 S Donahue Dr, Auburn, AL 36832, (2)Global Change Research, USDA-ARS National Soil Dynamics Lab, 411 S Donahue Dr, Auburn, AL 36832, dwatts@ars.usda.gov

Tillage and fertilization practices used in row crop production are thought to alter greenhouse gas emissions from soil. Thus, a field experiment was conducted at the Sand Mountain Research Station located in the Appalachian Plateau region of Northeast Alabama on a Hartsells fine sandy loam. Measurements of CO2, CH4, and N2O emissions were evaluated using GRACEnet protocols to assess the effects of different tillage (convention vs. no-till) and fertilizer application (banding vs. surface application) practices in a corn cropping system. Fertilizer sources consisted of urea-ammonium nitrate (UAN), ammonium nitrate (AN) and poultry litter (PL) applied at a rate of 170 kg ha-1 of available N. Surface application of fertilizers resulted in the greatest concentration of gaseous loss compared to banding of fertilizers. Conventional tillage practices also resulted in higher concentrations of gas emissions compared to no-tillage practices. These results suggest that banding fertilizers in no-tillage systems minimizes greenhouse gas emissions; and thus increase retention of soil nutrient including C and N that can be utilized by agronomic crops.

Session No. 68--Booth# 42

J22. U.S. Agriculture’s Role in Soil Carbon Sequestration and Greenhouse Gas Mitigation (GRACEnet) (Posters)
Tuesday, 7 October 2008: 8:00 AM-6:00 PM
, p.58
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