Abstract
The upper north Bosque River in Erath County is an impaired watershed, one of the causes being high concentrations of dairy effluent runoff. Dairies are seeking economical solutions for managing large volumes of manure in an environmentally friendly manner. This study identifies soil properties that contribute to P sequestration and specific soils in Erath County that effectively sequester P, thereby reducing P runoff. Chemical soil properties and clay percentages were analyzed and three tests were conducted to determine soil P sequestration potential: an ex situ lysimeter study, a P sorption capacity study, and an in situ lysimeter study. Clay, calcium carbonate equivalents, and soil reaction were properties with the greatest influence on P sequestration. Calcareous clay loam soils were identified as most effective in Erath County for manure effluent application because of the formation of calcium-phosphate bonds.
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