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 and Water Management Research: St. Paul, 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 St. Paul, Minnesota Soil and Water 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
                                            MOLINA, JAE - UNIV. OF MINNESOTAitem
                                            Clapp, Charlesitem
                                            ALLMARAS, RAYMOND - RETIRED USDA-ARSitem
                                            LAYESE, M - UNIV. OF MINNESOTAitem
                                            Baker, John
  Submitted to: American Chemical Society Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 12/2/2002
                                    Publication  Date: 12/2/2002
                                    Citation: Molina, J., Clapp, C.E., Allmaras, R.R., Layese, M.L., Baker, J.M. 2002. Dynamics of n-exchange between corn (zea mays l.) roots and soil microbes. American Chemical Society Abstracts. p. 105.Interpretive Summary:
                                Technical Abstract: Organic N released in soil by roots is mineralized by microbes to be recycled in roots.  The dynamics of this N mineralization-immobilization turnover between corn roots and microbes was quantified by the model NCSWAP/NCSOIL with data from corn field plots. The kinetics of inorganic N-15 in the 0- to 15- and 15- to 30-cm soil layers and organic N-15 in the above-ground corn was documented for 10 years of continuous corn fertilized with 20 and 200 kg NH4+-N ha-1 enriched with 8.0 kg N-15 ha-1 (4.0 and 40.0 atom-% N-15, respectively). N-15 was added for 5 consecutive years, then stopped to obtain relaxation kinetics. Residues were not returned to allow full impact of roots and root exudation on the system's dynamics. The soil was rototilled. The experimental kinetics are presented. Gross and net rates of the processes underlying these kinetics as described by the model are discussed.


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