EVALUATION OF SOIL TEST PHOSPHORUS ACCUMULATION FROM SWINE MANURE APPLICATIONS
Applied Research
Gerald Alexander
CEA-STAFF CHAIR
HOPE
Abstract
Beef cattle, poultry and swine livestock enterprises in Hempstead County Arkansas complement each other by providing cash flow and fertilizer for pastures. There is a dark side to this equation in the form of excess phosphorus deposition on soils and the potential for the movement of phosphorus into ground and surface waters of the state. In December 2002, a study to measure the increase in pounds per acre of Soil Test Phosphorus (STP) from application of liquid swine manure was initiated on a five acre plot within the broadcast area of an underground sprinkler system.Twenty plots measuring 0.25 acres in size were initially sampled and the soil samples were sent to the University of Arkansas Soil Testing Laboratory for analysis. The procedure has been conducted a total of 7 times since 2002 with STP levels rising in areas closest to the underground irrigation heads. Soil Test Phosphorus levels in pounds of phosphorus per acre since 2002 have indicated a slight rise in STP, but still below the arbitrary figure of 300 pounds STP per acre where no additional phosphorus fertilization is recommended.
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Authors: G. W. Alexander, M.B., Dr. Daniels
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Alexander, G. County Extension Agent - Staff Chair, University of Arkansas Cooperative Extension Service, Arkansas, 71801
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Daniels, M. Extension Water Quality and Nutrient Management Specialist, University of Arkansas Cooperative Extension Service, Arkansas, 72203