My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in SSSAJ

  1. Vol. 63 No. 5, p. 1455-1462
     
    Published: Sept, 1999


    * Corresponding author(s): wayne_robarge@ncsu.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2136/sssaj1999.6351455x

Soil Characteristics and Management Effects on Phosphorus Sorption by Highland Plateau Soils of Ethiopia

  1. Miressa Dufferaa and
  2. Wayne P. Robarge *a
  1.  aDep. of Soil Science, North Carolina State Univ., Box 7619, Raleigh, NC 27695-7619 USA

Abstract

Differences in crop and fertilizer management are known to influence P retention by soils. An experiment was conducted to study the effect of soil characteristics and management practices on P sorptoin behavior of the highland plateau soils of Ethiopia. Surface samples from two Vertisols, an Andisol, and an Alfisol were collected from farmers' fields, research station farms, and from non-cultivated-non-fertilized areas. Phosphorus sorption data were obtained by equilibrating 3-g soil samples in 30 mL of 0.01 M CaCl2 containing various amounts of KH2PO4 Inorganic P fractions were determined by the Hedley P fractionation scheme. There was little variation in P sorption among Vertisol samples of alluvial origin as a result of cultivation-fertilization practices. For soils of volcanic origin (Vertisol2 and Andisols), and the Alfisol, samples collected from farmers' fields sorbed more P than the non-cultivated and research station samples. Least amounts of applied P sorbed by the non-cultivated Andisol samples reflect the relatively large amounts of resin extractable P initially present in these soils and demonstrate that labile P initially present in the soil can influence subsequent P sorption. Stepwise regression analysis of the P sorption data showed that resin P accounts for 81% of the variation in P sorption at 0.2 mg P L−1 in solution. The highest amount of P was sorbed by samples collected from farmers' fields and was mainly due to the practice of continuous cropping with minimal P fertilization, which depletes labile P, and therefore requires higher levels of P fertilization for optimum crop yield.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 1999. Soil Science SocietySoil Science Society of America