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
                                            Halvorson, Jonathanitem
                                            Gonzalez, Javieritem
                                            HAGERMAN, ANN - MIAMI UNIVERSITY-OHIOitem
                                            Smith, Jeffrey
  Submitted to: Soil Biology and Biochemistry
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 7/9/2009
                                    Publication  Date: 7/21/2009
                                    Citation: Halvorson, J.J., Gonzalez, J.M., Hagerman, A.E., Smith, J.L. 2009. SORPTION OF TANNIN AND RELATED PHENOLIC COMPOUNDS AND EFFECTS ON SOLUBLE-N IN SOIL. Soil Biology and Biochemistry. 41:2002-2010.Interpretive Summary: Tannins, produced by plants, appear to rapidly attach to soil and affect the solubility of soil N but a more complete understanding of the nature and persistence of tannin-soil interactions is needed.  Forest and pasture soils were treated with several compounds to distinguish between the phenol and tannin effects on soil, and determine if tannin effects persist.  Tannins had little effect on the amount of inorganic-N remaining in soil while a simple related phenol removed most of it.  Significant amounts of the C, added with treatments, appeared to affix to soil and tannins decreased soluble-N in soil extracts.  Effects of the single application of tannins persisted through 12 washings with hot water resulting in less net cumulative extraction of C and N.  Tannins increased the amount of total C remaining in pasture soil but did not affect forest soil.  Both soils retained more N when treated with tannins.  In this study, effects of a simple tannin were greater than a related phenol compound and persisted.  These effects are likely to vary with land use and could be especially important near the surface where quantities of soil organic matter and biological activity are comparatively large and most easily affected by management.  This information will contribute to an assessment of the impacts of tannins and other phenolic compounds on soil organic matter formation, nutrient cycling and toxicity risk of some metals and improve the management of soils.
                                Technical Abstract: Some tannins, plant-derived polyphenolic compounds, can rapidly affix to soil and affect the solubility of labile soil-N but a more complete understanding of the nature and persistence of tannin-soil interactions is needed.  Forest and pasture soils from two depths were treated for 1 h with cool (23 C) water (Control)
or solutions that added 10 mg g-1 soil tannic acid (TA), an  imprecisely defined mixture of galloyl esters, gallic acid (GA), a phenol, or b-1,2,3,4,6-penta-O-galloyl-D-glucose (PGG), a  hydrolyzable tannin.  Soluble-C and N, in treatment supernatants, was measured to uncover evidence for sorption of treatments or
effects on extraction of soil-N.  Significant amounts of soluble-C, added with treatments, were not recovered in supernatants indicating sorption of nearly 90% of the PGG-C, about 75% of the TA-C but less than 25% of the GA-C in surface soil.  Disappearance of soluble-C from treatment supernatants was accompanied by a corresponding reduction of total phenolic content.  Treatments added a negligible amount of N to soil; but while PGG and TA reduced soluble-N, in extracts from surface soil, GA had little
effect.  Soluble-N in extracts was composed mainly of organic-N.  Effects of tannins persisted in surface soil through 12 washings with hot water (80 C), suggesting the formation of stable complexes with soil.  The proportion of initial soil-C and N remaining after all extractions was higher in samples treated with
PGG or TA than either the Control or GA treatment.  We conclude PGG readily sorbs to soil and reduces the solubility of soil organic-N unlike GA, its simple monomeric constituent.  These differences could be especially important near the surface where quantities of soil organic matter and biological activity are
comparatively large and most easily affected by management.


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