2012 Annual Report
Oxford - Two studies will be conducted at the Northeast Mississippi Experiment Station at Verona. In one study, we will evaluate the effects of FGD gypsum on an existing set of no-till cotton plots. FGD gypsum application rates of 0, 1, 1.5, 2, and 3 tons/acre would be applied on a replicated plot experiment. The other study will evaluate the effects of tillage-gypsum interactions on soybean yields. The three tillage treatments are no-till, fall chisel-harrow, and conventional. Plot sizes, gypsum application rates, and replications are identical to those for no-till cotton. Crop yields will be measured by the experiment station personnel responsible for all agronomic practices. Following harvest each growing season, soil cores will be collected to a depth of 36 inches from each plot and characterized for water dispersible clay as a measure of erodibility, particle size distribution, organic carbon content, pH, exchangeable Al, exchangeable bases, total calcium, sulfur, nitrogen, and phosphorus.
This cooperative project with the Tennessee Valley Authority investigates the effects of flue gas desulfurized gypsum (FGD-gypsum) on forage production, soil properties, and movement of phosphorus in association with land applications of poultry litter as a source of nutrients for southeastern soils. The overall project involves three Agricultural Research Service (ARS) locations (Auburn, Alabama, Oxford, Mississippi, and Watkinsville, Georgia). The U.S. Environmental Protection Agency’s (USEPA) Office of Resource Conservation and Recovery is cooperating in the project for risk assessment. In 2012 Watkinsville was one of 10 ARS locations closed on the basis of the U.S. Department of Agriculture (USDA) full-year appropriation for FY2012 signed by the President on November 18, 2011. All field and laboratory research activities ceased as of that date. The research team continued data processing and analysis and has submitted two journal manuscripts for publication. The project was transferred to USDA-ARS Southeast Watershed Research Lab after mid-June 2012. We contributed to a risk assessment for FGD-gypsum in cooperation with USEPA with sample analysis conducted at ARS’ Environmental Management and Byproducts Utilization Laboratory in Beltsville, Maryland. Annual reports were given to participating utilities and USEPA.