HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Google Scholar Articles by Bayless, E. R. Articles by Lampe, D. C. PubMed Articles by Bayless, E. R. Articles by Lampe, D. C. Agricola Articles by Bayless, E. R. Articles by Lampe, D. C. Related Collections Vadose Zone Processes and Chemical Transport Pesticides Best Management Practices

Simulated Fate and Transport of Metolachlor in the Unsaturated Zone, Maryland, USA

^a USGS, 5957 Lakeside Blvd., Indianapolis, IN 46278
^b USGS, 500 Pillsbury Dr., Minneapolis, MN 22807
^c USGS, 934 Broadway, Tacoma, WA 98402
^d USGS, MS 412, Denver Federal Center, Denver, CO 80225-0046
^e USGS, 1730 East Parham Rd., Richmond, VA 23228
^f USGS, 5957 Lakeside Blvd., Indianapolis, IN 46278. Commercial names are provided for purposes of identification only and should not be interpreted as an endorsement by the U.S. Geological Survey

View larger version (8K): [in this window] [in a new window]   Fig. 1. Measured and simulated bromide concentrations at 0.5 m depth. Squares indicate measured bromide concentrations; triangles indicate bromide concentrations less than the minimum reporting limit.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Measured and simulated soil-water contents at 1.1 m depth.

View larger version (16K): [in this window] [in a new window]   Fig. 3. Simulated and measured (A) metolachlor ethanesulfonic acid (MESA) and (B) metolachlor oxanilic acid (MOXA) concentrations at 0.5 m. Diamonds indicate measured degradate concentrations.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Simulated distribution of aqueous and sorbed concentrations of (A) metolachlor, (B) metolachlor ethanesulfonic acid (MESA), and (C) metolachlor oxanilic acid (MOXA) in the unsaturated zone. Units of adsorbed species are µg g–1; aqueous species are mg L–1.

View larger version (24K): [in this window] [in a new window]   Fig. 5. Plot of (A) metolachlor after 3, 5, 10, 15, and 20 yr of biannual metolachlor applications, (B) metolachlor ethanesulfonic acid (MESA) with aerobic-soil zone (only) degradation, and (C) MESA with uniform soil-profile degradation.