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
                                            Malone, Robert

                                                         - *Rob*item
                                            Shipitalo, Martinitem
                                            Wauchope, Robert

                                                         - *Don*item
                                            Sumner, Harold
  Submitted to: American Society of Agronomy Meetings
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 11/5/2000
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: The pre-emergence herbicides normally used for corn and soybean production (atrazine,  alachlor, metribuzin, linuron) are sometimes detected in runoff and groundwater at high levels. This problem may be reduced by growing transgenic, glufosinate-tolerant corn (Liberty-Linked) and glyphosate-tolerant soybean (Roundup Ready). Therefore, atrazine, alachlor, ,linuron, and glufosinate were surface applied to 3 large monolith lysimeters, and alachlor, metribuzin, and glyphosate were surface applied to 4 other large (2.4 m deep) monolith lysimeters. Herbicide losses in percolate were monitored throughout the growing season after a worst-case scenario: 10 cm of simulated rainfall in 2 hr shortly after herbicide application. Eight grab samples were collected from each lysimeter within 24 hours of rainfall initiation and composite samples were collected throughout the growing season. The highest concentrations of atrazine  (79-95 ppb), alachlor (4-13 ppb), linuron (4-14 ppb), and metribuzin (8-15 ppb) were generally detected within two hours of rainfall initiation on all eight lysimeters. Only a few glyphosate and glufosinate samples were above detection limits (5 ppb). The post-emergence herbicides are of lower toxicity compared to the pre-emergence herbicides and we generally observed less transport to shallow groundwater, therefore, they should have less adverse environmental impact.


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