Results 171 to 180 of about 2,661 (199)

A NUMERICAL EVALUATION OF SOME FLORIDA SPODOSOLS

Physical Geography, 1996
The POD Index, a numerical index of soil classification developed by Schaetzl and Mokma (1988) in the mesic to cryic temperature regimes of northern North America, was applied to 425 pedons in Florida to test its utility for soils in thermic and hyperthermic temperature regimes.
A. Goldin, J. Edmonds
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Tropical Spodosols in northeastern Amazonas State, Brazil

Geoderma, 2004
Abstract The white sand formation found in northeastern Amazonas State in Brazil showed three horizons—E, B, and C. The superficial horizon (E) was formed by sandy friable material of grayish to whitish colour with accumulations of organic matter in the form of wavy bands.
Adriana Maria Coimbra Horbe, Marco Antonio Horbe, Kenitiro Suguio   +2 more
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Kinetics of chemical weathering in b horizon spodosol fraction

Water Resources Research, 1991
Studies on a B horizon soil from Maine have been conducted to determine the weathering rate dependence on hydrogen ion concentration in soil solution. Effects of soil concentration and solution chemistry on chemical weathering rate were also investigated. Studies were conducted using a laboratory pH‐stat semicontinuous reactor at pH 2.7 and 3.5 for two
S.R. Asolekar, R.L. Valentine, J.L. Schnoor   +2 more
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Amorphous Material and Aluminum Interlayers in Quebec Spodosols

Soil Science Society of America Journal, 1980
Abstract Clay fraction from spodic B horizons of Appalachian and Laurentian soils was recovered after organic matter and sesquioxides removal. Sodium citrate and sodium hydroxide further extracted various amounts of Al, Si, and Fe. Samples from the Appalachian sites released < 5% Al 2
C. R. De Kimpe, M. R. Laverdiere
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pH‐Dependent Bonding of Potassium by a Spodosol

Soil Science Society of America Journal, 1969
Abstract A Spodosol Ap high in extractable Al and pH‐dependent CEC was limed to pH 6.3, producing deficiency of K in tomato seedlings. This was evidenced by lowered plant yields and concentrations of K in the tissue, compared with plants grown in acid samples of the soil.
R. J. Bartlett, J. L. McIntosh
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A Spodosol‐Entisol Transition in Northern Michigan

Soil Science Society of America Journal, 2002
Soils in northern lower Michigan, all formed in sandy glacial outwash, were examined to determine the effects of vegetation and fire frequency vs. climate on their development. To accomplish this, soil development was quantified for 13 pedons that span a region known as the Grayling Fingers.
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Clay Mineral Genesis of Some New York Spodosols

Soil Science Society of America Journal, 1972
Abstract Some Spodosols in northern New York previously shown to have well crystallized montmorillonite in the albic horizon but only amorphous clay sized material in the spodic horizon were studied to determine the source or genesis of the montmorillonite.
Gerald M. Coen, Richard W. Arnold
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Mineralogy of Two Sandy Spodosol Hydrosequences in Michigan

Soil Survey Horizons, 1995
This study was conducted to determine the effect of natural drainage on sand‐, silt‐, and clay‐size minerals in two sandy hydrosequences of Spodosols in northern Michigan. Depth to water tables were monitored using piezometers. Minerals in the dominant sand fraction were identified and quantified using a petrographic microscope.
S. Haile‐Mariam, D. L. Mokma
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Continuity of Ortstein in Sandy Spodosols of Michigan

Soil Survey Horizons, 1994
The presence of orstein adversely affects many agricultural and urban land uses. This study in Michigan was conducted to determine the nature of ortstein in mapped areas of Spodosols using conventional field techniques and ground‐penetrating radar (GPR).
D.L. Mokma, J.A. Doolittle, L.A. Tornes
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EXTRACTION OF PHENOLIC COMPOUNDS FROM A SPODOSOL PROFILE

Soil Science, 1985
The authors extracted phenolic compounds from each horizon of a Spodosol profile using three extractants: 0.1 M sodium pyrophosphate at pH 7.0 and 10.2, and 0.5 N sodium hydroxide at pH 13.4. Of 28 standard compounds evaluated seven phenolic compounds were identified: three carboxylic acids - protocatechuic, p-hydroxybenzoic, and vanillic acids; two ...
G. F. VANCE, S. A. BOYD, D. L. MOKMA
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