Characterization of Humic Acids from Idaho 'Slickspot' Soils. (5712)
Authors:
R.S. Vial - USDA-ARS, St. Paul, MN C.E. Clapp* - USDA-ARS, St. Paul,MN J.J. Clapp - USDA-ARS, St. Paul, MN T.J. Cary - USCOE-CRREL, Hanover, NH A.J. Palazzo - USCOE-CRREL, Hanover, NH N. Senesi - Univ. of Bari, Bari Italy
G. Brunetti - Univ. of Bari, Bari Italy
M.H.B. Hayes - Univ. of Limerick, Limerick Ireland K. Schmitt-Rohr - Iowa State Univ.
J.D. Mao - Iowa State Univ.
Abstract:
Naturally-occurring humic substances in soils hold promise as a factor related to restoring native plants. We have characterized the humic acids (HAs) of the Juniper Butte Range (JBR) soils, in Idaho, and determined carbon compounds that may promote the establishment of slickspot peppergrass (Lepidium papilliferum)
seedlings. Research included isolation and characterization of JBR soils in terms of HA content and relating this information to soil type and climate. Humic acids were extracted using a modified IHSS method, and isolated by membrane filtration, precipitated, dialyzed, and freeze-dried. Elemental analyses showed minor differences between HAs, with surface samples having higher C and N values.
Differences were also noted between sample sites for carbohydrates, amino acids, and acidity components. FTIR, fluorescence, and CPMAS 13C-NMR spectra provided valuable characterization and compositional information.
Speaker Information: C. E. Clapp, USDA-ARS, St. Paul,MN, Dept. of Soil, Water &
Climate Univ. of Minnesota 1991 Upper Buford Circle, St. Paul, MN 55108; Phone:
612-625-2767; E-mail: [email protected]
Session Information: Wednesday, November 3, 2004, 12:00 PM-2:00 PM Presentation Start: 12:00 PM (Poster Board Number: 2726)
Keywords: Humic Acid; Peppergrass; Slickspot Soil; NMR
