Enhanced Mineralization of [ 14 C]Atrazine in Kochia scoparia Rhizospheric Soil from a Pesticide-Contaminated Site
✍ Scribed by Perkovich, Brenda S.; Anderson, Todd A.; Kruger, Ellen L.; Coats, Joel R.
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 532 KB
- Volume
- 46
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
Mineralization of atrazine (6-chloro-NZ-ethyl-N4-isopropyl-1,3,5triazine-2,4-diamine) in soil treated with a mixture of atrazine and metolachlor (2-chloro-6'-ethyl-N-(2-methoxy-1-methylethyl)acet-o-toluidide at concentrations typical of point-source contamination (50 p g g -' each) was significantly greater ( P < 0.001) in rhizospheric soil from Kochia scoparia (L.) Roth., a herbicideresistant plant, than in non-vegetated and control soils. Soils were collected from an agrochemical dealership contaminated with several herbicides, including atrazine, metolachlor, trifluralin (cr,a,~-trifluoro-2,6-dinitro-~,N-dipropyl-p-toluidine and pendimethalin (N-( l-ethylpropyl)-2,6-dinitro-3,4-xylidene), at concentrations well exceeding the field application rates. Mineralization rates of ring-labeled atrazine in both rhizospheric and non-vegetated soils were quite high (>47% of the initial I4C applied after 36 days) compared to literature values. These results suggest that plants such as Kochia might be managed at pesticide-contaminated sites to help facilitate microbial degradation of wastes such as atrazine in soil.