Flue Gas Desulfurization Gypsum and Flooding Effects On Soybean Growth and Water Quality.

Waterlogging of soil can greatly reduce soybean yield. Gypsum amendments can improve the physical and chemical properties of soils by increasing soil aeration and water infiltration and reducing Al toxicity. However, there is a lack of information about the impacts of FGD gypsum on soybean grown on flooding wet soil and water quality. One greenhouse study using two varieties (Wooster and Wyandot) of soybean (Glycine max L.) and two types  of soils (sandy and clay soils) was conducted by application of FGD gypsum at 3.4 Mg ha^-1 to soil surface and waterlogging of the soils for 11 days. Soybean plant biomass, elements in shoots and leachate, chlorophyll in leaves, soluble P in ponding water and soil water extract were determined.