ARS | Publication request: CAN P SOIL TEST BE USED FOR PREDICTING RUNOFF P CONCENTRATIONS?

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: May 17, 1999
Publication Date: October 1, 1999
Citation: DANIEL, T.C., POTE, D.H., SHARPLEY, A.N., TORBERT, A., MOORE JR, P.A. 1999. CAN P SOIL TEST BE USED FOR PREDICTING RUNOFF P CONCENTRATIONS? SOIL SCIENCE SOCIETY OF AMERICA ANNUAL MEETING. p. 247.

Technical Abstract: To investigate which soil test P (STP) method best predicts P runoff concentration, soil and runoff samples were collected from seven soils in permanent pasture exhibiting a wide range of P levels due to prior manure applications. The STP was extracted by traditional (Mehlich III, Bray- Kurtz P1, and Olson) as well as potential environmental soil P (distilled water and iron-oxide paper) techniques. Simulated rain was used to produce runoff which was collected for 30 min. The r values for STP by each extraction method correlated with dissolved reactive P (DRP) and bioavailable P (BAP) concentrations in runoff, being highest for distilled water and iron-oxide paper (r-0.90). The relationship between the level of P in the soil and runoff was shown to vary with soil type and depth of sample.