Studies have shown that the biosolids application reduce runoff from treated rangeland. Results were attributed to increase increased ground surface roughness and water adsorption by the dry biosolids. Over time, the biosolids should decompose and have a less direct effect on surface runoff. However, the increase in vegetative cover in response to the fertilizer effect of the biosolids should further improve the surface hydrology of the treated rangeland. Potential surface water contamination by constituents in biosolids does not appear to be a problem. Nitrate-nitrogen, copper, and cadmium concentrations in the runoff water, both during natural and simulated rainfall, were below limits for groundwater and for livestock and wildlife watering areas. Potential surface water pollution by biosolids contaminants was not a problem with a one time application of 22.5 to 45 dry Mg/ha (10 to 20 dry ton/ac). The following are some case studies that you can read through to get an idea of typical applications.
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