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United States Department of Agriculture

Agricultural Research Service

Research Project: USE OF FGD GYPSUM TO IMPROVE CROP AND FORAGE PRODUCTION ON ERODIBLE SOILS OF THE SOUTH Project Number: 6420-12000-010-07
Project Type: Trust

Start Date: Feb 28, 2008
End Date: Feb 27, 2013

Objective:
We propose to evaluate FGD gypsum influences soil physical properties and losses of P from poultry litter on pastures. The research would help establish proper combinations of rates of FGD gypsum and poultry litter to reduce losses of P in runoff and improve soil productivity and provide documentation of water quality improvements associated with FGD gypsum needed to help qualify practices for use as a BMP and water quality improvement credits.

Approach:
Auburn – FGD gypsum and poultry litter will be applied at four rates (0, 2, 4, 6 Mg ha-1) to bermudagrass pasture to evaluate changes in available soil P over three years. FGD gypsum and poultry litter would be applied annually and measurements of soil P fractions (Total P, water soluble P, Mehlich P, and organic P) would be made at 6 month intervals. In addition we would evaluate FGD gypsum and poultry litter effects on forage production and quality along with the potential for nutrient removal by grazing and haying which is important for management of high P soils. Forage would be harvested at regular intervals to simulate haying and evaluated for P content (P removal) and forage quality. Results would establish potential for using FGD gypsum as an amendment to increase poultry litter application rates and improve water use efficiency on pasture and hay land.

Last Modified: 11/26/2014
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