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• Increased Crop Yield and Economic Return and Impro

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  FGD-gypsum is a soluble source of Ca and S, thus improving plant nutrition. FGD products, applied at rates sufficient to supply 30 lbs/acre of S, increased corn grain yields over a three year period from 113 bu/acre to 120 bu/acre. The relative yields of corn grain were greater at low N than at high N fertilizer rates suggesting improved N use efficiency. This will provide more profit to farmers and help reduce N pollution of the environment. In addition to improving nutrient levels in soil, FGD-gypsum applied at much higher rates (1,500-3,000 lbs/acre) also improves soil physical properties. This resulted in increased yield of corn grain under a no-tillage system, presumably by promoting soil aggregation and by increasing water surface infiltration rates and water movement into and through the soil profile. Chemical properties improved by application of FGD-gypsum include the mitigation of subsoil acidity and Al toxicity. Preliminary results suggest that the gypsum/no-tillage system had economic advantages compared to the no-gypsum/conventional tillage system for soybean production. Download report here

• Use of FGD Gypsum on a Bermudagrass in the Appalac

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  Gypsum additions to bermudagrass pastures, whether it is commercial gypsum, FGD gypsum or FGD gypsum + fly ash did not have a negative impact on yield. Thus, FGD gypsum or FGD gypsum + fly ash could potentially be used as a low cost alternative to commercial gypsum when gypsum is needed, such as a binding agent to reduced potential loss of soluble P 6 or as a calcium and sulfur additives.

• FGD Gypsum Filters Remove Soluble Phosphorus from

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  Three years of data provide evidence that the FGD gypsum filter is chemically effective at reducing soluble P, and there is no mercury or arsenic loss that would have a negative environmental impact.

• Coal Combustion Products Production & Use Statisti

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  Coal Combustion Products Production & Use Statistics. 

• Comparison of Mined Gypsum Pellets and FGD Gypsum

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  Water quality does not appear to be negatively affected by application of either FGD or PG at the maximum rate.

• Effects of FGD-Gypsum, Used-Wallboard and Calcium

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  Corn root length for plants grown with FGD applications was not different from that of used-wallboard treatment. Byproducts enhanced corn root growth but not that of soybean. Soybean was more sensitive to the materials than corn; therefore one should take into account the crop to which these materials will be applied. The reduction observed in soybean root length with increasing byproduct application rate may not occur if these materials are applied to soil which has higher buffering capacity than sand. Also in this study cups were not allowed to drain compared to field condition where drainage will occur.

• Evaluation of FGD-Gypsum to Improve Forage Product

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  Results from the one time application of FGD gypsum indicate positive reduction in P levels in runoff. FGD gypsum should therefore be useful for reducing risk of P loss and improving water quality in runoff from areas where poultry litter is used as a nutrient source. The data also indicates limited or no losses of elements of environmental concern from the FGD gypsum. At this point FGD gypsum appears to have significant potential for beneficial uses in agricultural systems.