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
                                            Gish, Timothyitem
                                            Daughtry, Craigitem
                                            Walthall, Charlesitem
                                            Russ, Andrew

                                                         - *Andy*item
                                            McKee, Lynnitem
                                            KUNG, K - UNIV OF WISCONSIN
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 10/7/2008
                                    Publication  Date: 10/7/2008
                                    Citation: Gish, T.J., Daughtry, C.S., Walthall, C.L., Russ, A.L., McKee, L.G., Kung, K. 2008. Using surface hydrology to improve nitrogen use efficiency [abstract]. Joint meeting between the Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Society of America, and the Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM. 2008 CDROM.Interpretive Summary:
                                Technical Abstract: Water availability and efficient use of nitrogen are critical to a sustainable and profitable crop production system.  At the ARS-USDA Optimizing Production Inputs for Economic Enhancement site in Beltsville, Maryland, two corn production fields about 4 ha each were studied over a four year period to evaluate nitrogen use efficiency under two different management practices.  One field, field B, used split application of nitrogen, receiving 30 kg/ha at planting and then about 120 kg N/ha as side-dressing when the corn was about 60 to 80 cm high.  The second field, field D, was under precision management -- receiving 30 kg N/ha at planting and then 0 to 140 kg N ha as side-dressing (same time as field B).  The amount of N applied in field D, for each 10 m by 10 m cell, at side-dressing depended primarily upon crop yield history and the location of subsurface flow pathways, previously determined with ground-penetrating radar.  The hypothesis was that nitrogen was typically excessively applied – leaving considerable N to leach and move through the subsurface.  If subsurface flow pathways could be quantified then corn plants down gradient would be feed via subsurface channels.  Knowing where the subsurface flow channels existed allowed less N to be applied down slop along the subsurface flow pathways.  The precision site generally received about 40% less nitrogen than the split application site however there was no significant reduction in yields.  This work demonstrates that knowledge of the subsurface hydrology can improve nitrogen use efficiency and thereby increase farm sustainability.


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