The application of FBC or FGD byproducts to selected areas of an agricultural watershed has the potential to reduce the phosphorus enrichment of surface runoff without appreciably reducing plant-available phosphorus concentration levels. Use of FBC or FGD would allow soil phosphorus levels to be reduced through cropping over time, while controlling phosphorus export to surface waters in the short term. Clearly, this presumes that erosion from phosphorus source areas are controlled, otherwise the amendment effect on export of algal available phosphorus would be much less.

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