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

Abstract

 

This article in SSSAJ

  1. Vol. 54 No. 4, p. 979-982
     
    Received: Aug 1, 1988
    Published: July, 1990


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions

doi:10.2136/sssaj1990.03615995005400040007x

Organic Selenium Distribution in Selected California Soils

  1. M. M. Abrams,
  2. R. G. Burau  and
  3. R. J. Zasoski
  1. Dep. of Environmental Science and Engineering, Oregon Graduate Inst. of Science and Technology, 19600 N.W. Von Neumann Dr., Beaverton, OR 97006-1999
    Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616

Abstract

Abstract

The distribution of organic Se was determined in seven soils from central California. Six of these soils (one Typic Pelloxerert, three Typic Torriorthents, one Vertic Torriorthent, and one Entic Chromoxerert) were in a toposequence from an area thought to be relatively high (>1000 µg total Se kg−1) in native Se. The seventh soil, Yolo (a Typic Xerorthent), thought to be low in native Se, was included for comparison. Three of the soils in the toposequence had total Se levels less than 1000 µg kg−1; the basin soil (Tachi; Typic Pelloxerert) had less than the Yolo soil. A solution of 0.1 M NaOH/0.1 M Na4P2O7 (alkaline pyrophosphate) extracted an average of 12% of the total Se, but this ranged from 5 to 32%. Organic Se accounted for 50% or more of the NaOH-Na4P2O7 extractable Se in all but the poorly drained Ciervo clay (Typic Torriorthent), which had about 40% in an organic form. Extracted organic Se compounds were fractionated into humates and hydrophobic and hydrophilic fulvates. Selenium associated with hydrophobic fulvates was high in the soils of intermediate toposequence elevation. Selenomethionine was identified by gas chromatography/mass spectrometry in the hydrophilic fulvate fraction of the Yolo soil and in three soils from the toposequence. The high percentage of extractable Se associated with organic matter in these soils represents a pool of potentially plant-available Se.

Contribution from the Dep. of Land, Air and Water Resources, Univ. of California and the California Agric. Exp. Stn.

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

Copyright © . Soil Science Society of America

Facebook   Twitter