| The fate of phosphorus from long-term biosolids application to agricultural land is of interest. The primary goal of this study is to determine the fate of phosphorus after many years of biosolids application to nearby farmland by the City of Sioux Falls' wastewater Treatment Plant. The secondary goal is to then give further recommendations to the city of Sioux Falls regarding their current biosolids application practices based on results of the primary goal.;Two sites were selected that have had 10 years of surface application of biosolids. One site was a grass pasture the other an alfalfa field. Soil samples were collected starting at the summit and continuing down slope to the toe taking samples at various landscape positions. This pattern of sampling allowed for the tracking of phosphorus down slope.;The soil samples were then analyzed for the following parameters; total phosphorus, organic phosphorus, inorganic phosphorus, plant available phosphorus, phosphorus buffering, free Fe and Mn, inorganic carbon, bulk density and pH. (Abstract shortened by UMI.). |
