Guidelines for selenium in irrigation waters. [Medicago sativa L]
- Univ. of California, Riverside (USA)
Because of the relatively high concentration of Se in the agricultural drainage water of the west side of the San Joaquin Valley (SJV) in California and the potential for reuse of these waters on salt tolerant crops, a reassessment of quality criteria for Se in irrigation waters for this area was needed. The specific conditions for this area that justified a reassessment were (i) the Se in the drainage waters of the West Side is largely in the selenate (SeO{sub 4}) form which is not appreciably adsorbed by soils and is thus readily leached from the root zone, (ii) the waters containing high concentrations of Se have substantial concentration of sulfate (SO{sub 4}) that dramatically reduce SeO{sub 4} adsorption by plants, (iii) the salinity of the waters that contain high Se concentrations demand leaching fractions (LF) that insure that Se is also leached from the root zone, and (iv) kinetics of Se-species transformations. Recent research with alfalfa (Medicago sativa L.), which is one of the most sensitive as crop growth for Se accumulation, suggests that this crop can tolerate an average soil solution Se concentration (Se{sub ss}) of 250 {mu}g/L without exceeding the limit of 4 mg Se/kg in the dry weight of forage that has been set to protect bovine animals from Se toxicity. The recommended maximum Se{sub iw} for alfalfa grown on the West Side of the SJV is 100 {mu}g/L. Guidelines for other crops can be established if the relationships among Se{sub iw}, Se{sub ssm}, LF, the Se in harvested products Se{sub hp}, and the maximum Se{sub hp} for various uses of products for protection of wildlife, domestic animals, and humans are known.
- OSTI ID:
- 6958121
- Journal Information:
- Journal of Environmental Quality; (USA), Vol. 18:3; ISSN 0047-2425
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALFALFA
PLANT GROWTH
SELENIUM
POLLUTION REGULATIONS
CALIFORNIA
IRRIGATION
RECOMMENDATIONS
SALINITY
SULFATES
TOXICITY
WATER POLLUTION
ELEMENTS
FEDERAL REGION IX
GROWTH
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NORTH AMERICA
OXYGEN COMPOUNDS
PLANTS
POLLUTION
REGULATIONS
SEMIMETALS
SULFUR COMPOUNDS
USA
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology