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Original Articles

Effects of Source and Amount of Phosphorus on Sorption Kinetics in the Topsoil of a Highly Weathered Soil

, &
Pages 885-893 | Received 16 Jun 2005, Accepted 16 Mar 2006, Published online: 24 Apr 2007
 

Abstract

Soil chemical and physical reactions involving phosphorus (P) must be understood to predict the risk of P being transported from agricultural land to streams and lakes. The kinetics of P sorption by an Ultisols from West Virginia, USA, receiving P from fertilizers were compared to soils amended with turkey litter. Addition of 6.6 and 13.2 Mg turkey litter ha−1 increased Bray 1P levels to about the same level as adding 53 and 115 kg P ha−1, respectively. Phosphorus binding capacity decreased to a greater extent when P was added as fertilizer as compared to turkey litter. For example, P binding maximum was 360 mg P kg−1 dry soil when soil was amended with 6.6 Mg turkey litter ha−1 as compared to 260 mg P kg−1 dry soil when amended with 53 kg P ha−1. This study demonstrates that the decrease in P‐binding capacity with increasing soil P is less when P is added as turkey litter.

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