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
 Soil Management Research: Morris, MN
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                                    Software
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Midwest Area Morris, Minnesota Soil Management Research 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
                                            Johnson, Janeitem
                                            Archer, Daviditem
                                            Barbour, Nancy
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 11/8/2007
                                    Publication  Date: 11/8/2007
                                    Citation: Johnson, J.M., Archer, D.W., Barbour, N.W. 2007. Three years of greenhouse gas flux from contrasting management scenarios in the northern Corn Belt [abstract][CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting. Nov. 4-8, 2007, New Orleans, LA.Interpretive Summary:
                                Technical Abstract: Long-term cropping systems field plots were established in 2002 in west central Minnesota to compare tillage, rotation and fertilizer treatments and to identify and develop economically-viable and environmentally-sustainable farming systems. It is hypothesized that minimized tillage and diversified crop rotation can improve soil quality and enhance sustainability. As part of the USDA-Agricultural Research Service, Greenhouse gas Reduction through Agricultural Carbon Enhancement (GRACEnet) project, greenhouse gas emission was monitored in a subset of treatments. Treatments were selected to represent three different scenarios: "business as usual," "maximum C sequestration" and "optimum greenhouse gas benefits." The "business as usual" scenario has conventional tillage (chisel or moldboard plow), and receives high fertilizer inputs in a corn-soybean rotation. The "maximum C sequestration" scenario is strip tilled with a mole-knife, and receives high fertilizer inputs in a corn-soybean-wheat/alfalfa-alfalfa rotation. The "optimum greenhouse gas benefits" scenario is strip tilled with a mole-knife but receives no fertilizer inputs in a corn-soybean-wheat/alfalfa-alfalfa rotation. Nitrous oxide and carbon dioxide emission have been monitored using vented static chambers, since April 2004, methane since March 2005. Collateral information collected included weather data, soil temperature and volumetric soil moisture at time of sampling. Two collars were installed in each plot sampled: for row crops, one collar was positioned adjacent to the row and the second collar was in the inter-row; in wheat and alfalfa, collars were positioned randomly with regard to plants. A total of 40 plots (80 collars) were sampled typically every other week. The greatest nitrous oxide flux occurred during spring thaw events, which accounted for 33% to 55% of the flux for 2005 and 2006. Additional events corresponded primarily to nitrogen fertilizer events. Under these managements the soil tended to be neutral to slight methane sinks. Economic and environmental impact among the scenarios will be compared.


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