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Phosphorus Relationships in Runoff from Fertilized Soils¹

ABSTRACT

The effect of P fertilizer mixed into soil on the P composition of runoff was studied. Runoff samples from artificial rainstorms on fallow plots of Russell sil soil, and P enriched soil-water mixtures (1:50) of Russell sil and selected other soils were analyzed for water soluble orthophosphate and extractable, total, and organic P in sediment. The relation of P addition rate to the soluble orthophosphate or sediment extractable phosphorus level in runoff was approximately linear. The relation of soluble orthophosphate to extractable P in soil-water systems was linear for most soils studied. Soluble orthophosphate and extractable P in sediment were not related to total P or to organic P in sediment. A procedure was suggested for estimating the soluble orthophosphate concentration in runoff from fertilized wet soil using laboratory analyses.

Key Words: sediment • pollution

¹ Contribution from ARS, USDA, in cooperation with the Purdue Agr. Exp. Sta. Purdue Journal Series Paper no. 5029.

² Soil Scientist, ARS, and Assistant Professor of Agronomy; and Assistant Professor of Agronomy, respectively.

Received for publication March 30, 1973.