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
 Columbia Plateau Conservation Research Center: Pendleton, OR
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Related TopicsSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Pacific West Area Pendleton, Oregon Columbia Plateau Conservation Research Center 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
                                            Gollany, Heroitem
                                            ALLMARAS, RAYMOND - USDA-ARS RETIREDitem
                                            Albrecht, Stephanitem
                                            Copeland, Stephenitem
                                            DOUGLAS, JR, CLYDE - USDA-ARS RETIRED
  Submitted to: Agronomy Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/22/2005
                                    Publication  Date: 11/6/2005
                                    Citation: Gollany, H.T., Allmaras, R., Albrecht, S.L., Copeland, S.M., Douglas, Jr, C.L. 2005. Tillage and nitrogen fertilizer influences on carbon and soluble silica relations. Agronomy Abstracts.Interpretive Summary:
                                Technical Abstract: Long-term experiments are ideal for evaluating the influence of agricultural practices on soil organic carbon (SOC) accretion.  Little is known about the influence of tillage and nitrogen (N) fertilization on SOC distribution and silica (Si) movement in a soil. This study: i) determined the effect of tillage and N fertilizer on SOC accretion in a Walla Walla silt loam soil (coarse-silty, mixed, superactive, mesic Typic Haploxeroll), and ii) examined the subsequent influence of fine organic matter on silica movement. A long-term fallow-wheat (Triticum aestivum L.) experiment with two tillages (moldboard plow and sweep) and two N rates (45 and 180 kg N/ha) was established in 1940, in a randomized block with split-plot design and three replications. Soil cores (2-cm depth increments) were used to measure coarse organic matter, fine organic matter, pH, bulk density, water-soluble C, and water-soluble Si. The fraction for the sweep (6.6 kg C/m^2) was 14% higher than the moldboard plow (5.8 kg C/m^2) for the 180 kg N/ha in the 0- to 60-cm depth. After 44-yr of N addition, the SOC storage for 180 kg N/ ha rate (6.2 kg C/m^2) had increased only 3% compared to 45 kg N/ha rate (6.0 kg C/m^2).  Total water-soluble Si in the B horizon were 34% and 39% greater than in the Ap horizon for the moldboard plow and sweep systems, respectively. Interaction of tillage and N with water-soluble Si suggests that SOC provides a mechanism to suppress Si solubility, which impacts siliceous pan formation, reduces soil mechanical resistance, and enhances drainage and plant growth.


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