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Author Gish, Timothy J. ♦ Prueger, John H. ♦ Kustas, William P. ♦ Daughtry, C. S. T. ♦ McKee, Lynn G. ♦ Russ, Andy ♦ Hatfield, Jerry L.
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Agronomy
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Social sciences ♦ Social problems & services; associations ♦ Social welfare problems & services ♦ Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Technology ♦ Medicine & health ♦ Human physiology ♦ Personal health & safety ♦ Pharmacology and therapeutics ♦ Diseases ♦ Agriculture & related technologies ♦ Techniques, equipment & materials
Subject Domain (in MeSH) Inorganic Chemicals ♦ Organic Chemicals ♦ Chemical Actions and Uses ♦ Chemicals and Drugs ♦ Physical Phenomena ♦ Biological Phenomena ♦ Biological Sciences ♦ Environment and Public Health ♦ Health Care ♦ Geographic Locations ♦ Geographic Locations
Subject Keyword Discipline Environmental Health ♦ Acetamides ♦ Analysis ♦ Environmental Monitoring ♦ Herbicides ♦ Soil Pollutants ♦ Chemistry ♦ Maryland ♦ Time Factors ♦ Volatilization ♦ Water ♦ Water Movements ♦ Comparative Study ♦ Journal Article
Abstract A 3-yr study was conducted to focus on the impact of surface soil water content on metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide) volatilization from a field with different surface soil water regimes created by subsurface water flow paths. Metolachlor vapor fluxes were measured at two locations within the field where local meteorological and soil conditions were relatively constant, except for surface soil water content, which differed significantly. Surface soil water content at the two sites differed in response to the presence of subsurface flow pathways. Detailed soil moisture observations over the duration of the study showed that for the first 2 yr (2004 and 2005), surface soil water contents at the dry location (V1) were nearly half those at the wetter location (V2). Cumulative metolachlor vapor fluxes during 2004 and 2005 at V1 were also about half that at V2. In the third year (2006), early-season drought conditions rendered the soil water content at the two locations to be nearly identical, resulting in similar metolachlor volatilization losses. Analysis of infrared soil surface temperatures suggests a correlation between surface soil temperatures and metolachlor volatilization when soils are wet (2004 and 2005) but not when the soils are dry (2006). Field-averaged metolachlor volatilization losses were highly correlated with increasing surface soil water contents (r(2) = 0.995).
Spatial Coverage Maryland
Description Country affiliation: United States
Author Affiliation: Gish TJ ( USDA-ARS Hydrology and Remote Sensing Laboratory, Beltsville, MD, USA.
ISSN 00472425
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2009-09-01
Publisher Place United States
e-ISSN 15372537
Journal Journal of Environment Quality
Volume Number 38
Issue Number 5

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Source: WHO-Global Index Medicus