| Abstract: | The loss of the preemergent herbicide atrazine in surface runoff from experimental field plots growing corn (Zea mays L.) was significantly reduced using a starchencapsulated formulation versus a conventional powdered formulation. Field edge losses of starch-encapsulated atrazine were described as following a Rayleigh distribution totaling 1.8% of applied herbicide compared to exponential powdered atrazine losses of 2.9% applied - a 40% decrease. This has important implications for the reduction of nonpoint source contamination of surface water by agricultural chemicals. Unsaturated zone release of starchencapsulated atrazine was gradual, but comparable weed control was maintained. Deethylatrazine was a major dealkylated metabolite from each formulation, and deisopropylatrazine was a minor metabolite. The determination of soil partition coefficients for deethylatrazine and deisopropylatrazine (0.4 and 0.3, respectively), aqueous solubilities (3200 and 670 mg/L, respectively), and melting points (133 and 177 ??C, respectively) confirmed that the dealkylated metabolites should move more rapidly through the soil profile to groundwater than atrazine. |
| Genre: | Article |
| ProdID: | 70017473 |
| Citation Author: | Mills, M. S.; Thurman, E. M. |
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| Citation End Page: | 79 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Reduction of nonpoint source contamination of surface water and groundwater by starch encapsulation of herbicides; 1994; Article; Journal; Environmental Science and Technology; Mills, M. S.; Thurman, E. M. |
| Citation Start Page: | 73 |
| Citation Volume: | 28 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Reduction of nonpoint source contamination of surface water and groundwater by starch encapsulation of herbicides; 1994; Article; Journal; Environmental Science and Technology; Mills, M. S.; Thurman, E. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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