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
                                            HIVELY, WELLS - Us Geological Survey (USGS)item
                                            Lang, Meganitem
                                            McCarty, Gregoryitem
                                            Sadeghi, Aliitem
                                            KEPPLER, JASON - Maryland Department Of Agriculture
  Submitted to: Soil Science Society of America Annual Meeting
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/15/2009
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: The Choptank River Watershed Conservation Effects Assessment Project (CEAP) has now accumulated a four-year set of quarterly SPOT satellite images taken over the Eastern Shore of the Chesapeake Bay watershed. Imagery collected in December and March of each year were used to estimate the productivity and nutrient uptake associated with 2390 farm fields that were enrolled in Maryland Agricultural Cost Share (MACS) programs for winter cover crops between 2005 and 2009. Agronomic data for each field (planting date, planting method, species, previous crop) were provided by MACS documentation, and on-site sampling of approximately 90 on-farm locations per image date were used to calibrate the correlation between satellite NDVI and aboveground cover crop biomass, to measure tissue nitrogen concentrations, and to observe cover crop effects on residual soil nitrate.  Results show significant reduction in nutrient uptake efficiency when compared to optimal management, with performance reductions largely affected by late planting dates and species choice.  Results can be used to calculate watershed nitrogen uptake associated with winter cover crops on a watershed basis, to improve cover crop implementation strategies, and to calculate the observed dollar costs per kilo of N sequestered for various cover cropped fields and locations.


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