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Nature of Clay-Humic Complexes in an Agricultural Soil

I. Chemical, Biochemical, and Spectroscopic Analyses

^a USDA-ARS, National Soil Tilth Lab., 2150 Pammel Drive, Ames, IA 50011
^b USDA-ARS, Southwest Watershed Research Center, 2000 E. Allen Road, Tucson, AZ 85719-1596
^c Dep. of Plant and Soil Sciences, Mississippi State Univ., P.O. Box 9555, Mississippi State, MS 39762

View larger version (25K): [in a new window]   Fig. 1. X-ray diffraction (XRD) patterns of H2O2-treated clay fractions from the Webster soil. The samples were Ca-saturated, oriented on glass slides, air dried, and analyzed using Cu K radiation.

View larger version (19K): [in a new window]   Fig. 2. Solid state-magic angle spinning 13C-NMR spectra of the (a) untreated coarse and (b) fine clay fractions from the Webster soil.