Full TGIF Record # 125176
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DOI:10.1080/00103620701327976
Web URL(s):http://www.informaworld.com/smpp/section?content=a778484401&fulltext=713240928
    Last checked: 06/29/2007
    Access conditions: Item is within a limited-access website
Publication Type:
i
Report
Author(s):Lin, C. H.; Lerch, R. N.; Garrett, H. E.; Jordan, D.; George, M. F.
Author Affiliation:Lin, Garrett, and George: Center for Agroforestry, School of Natural Resources, University of Missouri, Columbia, Missouri; Lerch: United States Department of Agriculture - Agricultural Research Service, Cropping Systems and Water Quality Research Unit, Columbia, Missouri; Jordan: Department of Math and Science, Alabama State University, Montgomery, Alabama
Title:Ability of forage grasses exposed to atrazine and isoxaflutole to reduce nutrient levels in soils and shallow groundwater
Source:Communications in Soil Science and Plant Analysis. Vol. 38, No. 9/10, May 2007, p. 1119-1136.
# of Pages:18
Publishing Information:New York, NY: Marcel Dekker
Keywords:TIC Keywords: Bioremediation; Denitrification; Herbicides; Lysimeters; Buffer zones; Atrazine; Isoxaflutole; Nutrients; Nitrates; Leaching; Groundwater
Abstract/Contents:"Successful implementation of vegetative buffers requires inclusion of plant species that facilitate rapid dissipation of deposited contaminants before they have a chance to be transported in surface runoff or to shallow groundwater. Thirty-six field lysimeters with six different ground covers [bare ground, orchardgrass (Dactylis glomerata L.), tall fescue (Festuca arundinacea Schreb.), smooth bromegrass (Bromus inermis Leyss.), timothy (Phleum pratense L.), and switchgrass (Panicum virgatum L.)] were established to evaluate the ability of grasses to reduce nutrient levels in soils and shallow groundwater. Nitrate (NO3-) and orthophosphate (PO43-) were uniformly applied to each lysimeter. In addition, half of the lysimeters received an application of atrazine, and the other half received isoxaflutole (Balance) at levels indicative of surface runoff from cropland. The leachate from each lysimeter was collected after major rainfall events during a 25-day period, and soil was collected from each lysimeter at the end of the 25-day period. Water samples were analyzed for NO3-N and PO4-P, and soil samples were analyzed for NO3-N. Grass treatments reduced NO3-N levels in leachate by 74.5 to 99.7% compared to the bare ground control, but timothy was significantly less effective at reducing NO3-N leaching than the other grasses. Grass treatments reduced residual soil NO3-N levels by 40.9 to 91.2% compared to the control, with tall fescue, smooth bromegrass, and switchgrass having the lowest residual levels. Switchgrass decreased PO4-P leaching to the greatest extent, reducing it by 60.0 to 74.2% compared to the control. The ability of the forage grasses to reduce nutrient levels in soil or shallow groundwater were not significant between herbicide treatments. Quantification of microbial NO3- dissipation rates in soil suggested that denitrification was greatest in switchgrass, smooth bromegrass, and tall fescue treatments. The overall performance of these three grasses indicated that they are the most suitable for use in vegetative buffers because of their superior ability to dissipate soil NO3- and reduce nutrient transport to shallow groundwater."
Language:English
References:47
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lin, C. H., R. N. Lerch, H. E. Garrett, D. Jordan, and M. F. George. 2007. Ability of forage grasses exposed to atrazine and isoxaflutole to reduce nutrient levels in soils and shallow groundwater. Commun. Soil. Sci. Plant Anal. 38(9/10):p. 1119-1136.
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DOI: 10.1080/00103620701327976
Web URL(s):
http://www.informaworld.com/smpp/section?content=a778484401&fulltext=713240928
    Last checked: 06/29/2007
    Access conditions: Item is within a limited-access website
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MSU catalog number: S 590 .C54
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