U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            McKee, Lynnitem
                                            Gish, Timothyitem
                                            Prueger, John
  Submitted to: American Society of Agronomy Meetings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 4/30/2003
                                    Publication  Date: 11/4/2003
                                    Citation: McKee, L.G., Gish, T.J., Prueger, J.H. 2003. Impact of climate on watershed scale volatization fluxes of metolachlor and atrazine [CD-ROM].  Crop Science Society, Soil Science Society of America.  Denver, Colorado:  Agronomy Society of America.Interpretive Summary:
                                Technical Abstract: Agricultural chemicals can enter environments where they were not intended by one or more of three major processes, volatilization, surface runoff, and/or subsurface leaching.  Although soil moisture and temperature have been cited as influencing pesticide volatilization, the relevance of climatic conditions on watershed scale pesticide volatilization is poorly understood.  In this study, the impact of climate on watershed scale pesticide volatilization fluxes is studied by evaluating metolachlor and atrazine volatilization fluxes over 5 years at the USDA-ARS Optimizing Production Inputs for Economic and Environmental Enhancement program in Beltsville, Maryland.  Throughout the 5-year study, tillage, management practice and pesticide formulation where held constant. Volatilization rates of pre-emergent herbicides metolachlor and atrazine, applied as a broadcast spray, were calculated with a flux-gradient technique using data from eddy correlation measurements.  Regardless of weather conditions, pesticide flux profile concentrations of metolachlor and atrazine were large during the first 24 hours and quickly declined for the duration of the study.  However, climatic conditions had a dramatic impact on the total pesticide loss to the atmosphere, with metolachlor vapor losses ranging from 3 to 20% of that applied.  As a result, temperature and timing of precipitation events relative to chemical application will have a critical impact on pesticide volatilization losses.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov