Document Detail

Effect of grasses on herbicide fate in the soil column: infiltration of runoff, movement, and degradation.
MedLine Citation:
PMID:  15379004     Owner:  NLM     Status:  MEDLINE    
The objective of the present study was to evaluate if the presence of grass or the type of grass influences the environmental fate of herbicides within a soil column. Intact soil columns were planted with either smooth brome, big bluestem, tall fescue, switchgrass, or a mixture of prairie grasses or were left unvegetated. Artificial runoff containing atrazine, metolachlor, and pendimethalin was applied to the columns and allowed to infiltrate, and the resulting leachate was collected at the bottom of the soil column. This process was repeated on day 7 with herbicide-fortified runoff and on days 14 and 21 with water only. Following the leaching experiments, soil from the columns was fortified with either [14C]atrazine or [14C]metolachlor to measure pesticide degradation potential. The mean time necessary for infiltration of the artificial runoff decreased from 7.5 h for unvegetated to 3.4 h for grassed soil columns, and the type of grass did not have a significant effect. Neither the type of grass nor the presence of grass caused a significant change in the total amount of herbicide that leached through the columns. However, the presence of some grasses did decrease the amount of herbicide that leached in the final two events (i.e., additions not fortified with herbicide). Fescue was the least effective, reducing the amount of leached atrazine and metolachlor by 13% and 33% respectively, and mixed prairie grass was most effective, with reductions of 43% and 44%, respectively. In addition, atrazine and metolachlor degraded more rapidly in soil vegetated by some grasses. Mixed prairie grass had the greatest effect, increasing atrazine mineralization by 260% and formation of metolachlor-bound residue by 760%.
Jason B Belden; Joel R Coats
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental toxicology and chemistry / SETAC     Volume:  23     ISSN:  0730-7268     ISO Abbreviation:  Environ. Toxicol. Chem.     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-09-21     Completed Date:  2005-04-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8308958     Medline TA:  Environ Toxicol Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2251-8     Citation Subset:  IM    
Department of Entomology, Iowa State University, Ames, Iowa 50014, USA.
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MeSH Terms
Acetamides / analysis,  chemistry
Aniline Compounds / analysis,  chemistry
Atrazine / analysis,  chemistry
Biodegradation, Environmental
Environmental Pollution / prevention & control
Herbicides / analysis*,  chemistry,  metabolism
Poaceae / chemistry,  metabolism*
Soil Pollutants / analysis*
Time Factors
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Acetamides; 0/Aniline Compounds; 0/Herbicides; 0/Soil Pollutants; 0/Water Pollutants, Chemical; 1912-24-9/Atrazine; 40487-42-1/pendimethalin; 51218-45-2/metolachlor

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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