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Distribution of selenium in soils of agricultural fields, western San Joaquin Valley, California

Soil Science Society of America Journal

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DOI: 10.2136/sssaj1988.03615995005200050011x

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Abstract

Soils from three agricultural fields in the Panoche Creek alluvial fan area in the western San Joaquin Valley, California, were analyzed for soluble, adsorbed, and total concentrations of selenium (Se) to assess the distribution and forms of Se in relation to the leaching of Se from soils. This assessment is needed to evaluate the importance of soil Se in affecting ground water concentrations. Soil samples were collected from three fields with drainage systems of different ages (6, 15, 1.5 yr) and different Se concentrations in drain water (58, 430, 3700 µg L−1, respectively). Concentrations of soluble Se and salinity were highest in soils from the field drained for 1.5 yr and lowest in the field drained for 6 yr. Of the total concentration of soil Se from all three fields, the proportion of adsorbed and soluble Se ranged from 1 to 11% and <1 to 63%, respectively. Most of the soluble Se was present as selenate and most of the adsorbed Se was found to be selenite. Consistent with a model of evaporative concentration of Se and salinity in soils and shallow ground water in this area, most of the variance in soluble Se is explained by salinity (r2 > 0.68) in saturation extracts of soils sampled from below the water table. In contrast, most soluble salts and Se apparently have been leached from the unsaturated soils in the fields drained for 6 and 15 yr. For the leached soils, dissolution and precipitation of evaporite minerals containing Se may no longer control concentrations of soluble Se.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Distribution of selenium in soils of agricultural fields, western San Joaquin Valley, California
Series title:
Soil Science Society of America Journal
DOI:
10.2136/sssaj1988.03615995005200050011x
Volume
52
Issue:
5
Year Published:
1988
Language:
English
Publisher:
Soil Science Society of America
Description:
10 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Soil Science Society of America Journal
First page:
1274
Last page:
1283
Country:
United States
State:
California
Other Geospatial:
San Joaquin Valley