Results 141 to 150 of about 461 (186)

Electrokinetic determination of the buffer capacity of Andisols

Science of The Total Environment, 2007
Among methods which involve the flow of electric current, the electro-remediation techniques have shown useful both for the removal of polluting species, and for obtaining a series of parameters in relatively laboratory simple experiments which can be used to characterize soils.
Mario V, Vázquez, Felipe, Hernández-Luis, Dora, Benjumea, Domingo, Grandoso, Mercedes, Lemus, Carmen D, Arbelo   +5 more
openaire   +2 more sources

Lytell Series: A Nonvolcanic Andisol

Soil Science Society of America Journal, 1987
Abstract In 1978, a proposal was made to form a new order of Andisols in Soil Taxonomy . This new order would allow greater recognition of the unique properties of soils that developed in volcanic tephra.
C. R. Hunter, B. E. Frazier, A. J. Busacca   +2 more
openaire   +1 more source

Nanoclays from an Andisol: Extraction, properties and carbon stabilization

Geoderma, 2011
Abstract Soils contain an abundance of nano-size particles. Because of their tendency to aggregate and associate with organic colloids, however, soil nanoparticles are difficult to obtain and characterize. Here we report on a simple and rapid method of extracting mesoporous nanomaterials from the clay fraction of an Andisol with narrow size ...
Mark Welland, Maria Luz Mora, Cornelia Rumpel   +2 more
exaly   +9 more sources

Allophane, imogolite, and gibbsite in coatings in a Costa Rican Andisol

Geoderma, 1995
Abstract Neoformation of allophane, imogolite, and gibbsite has been studied extensively in soils in humid climates, but little is known about their micro distribution patterns. such information may provide insight about the conditions at the micro-site scale, responsible for their formation and disappearance.
Jongmans, Ag, Verburg, P., Nieuwenhuyse, A., van Oort, Folkert, F.   +3 more
openaire   +3 more sources

Inheritance of 2:1 Phyllosilicates in Costa Rican Andisols

Soil Science Society of America Journal, 1994
Abstract The occurrence of 2:1 phyllosilicates in Andisols is variously ascribed to in situ pedogenic origin, aeolian addition, or the presence of hydrothermally altered rock fragments. We studied the origin of 2:1 phyllosilicates that occur in Holocene Hapludands on andesitic, sandy beach ridges in Costa Rica by micromorphological ...
Jongmans, Ag, van Oort, Folkert, F., Nieuwenhuyse, A., Buurman, P., Jaunet, A.M., van Doesburg, J.D.J.   +5 more
openaire   +3 more sources

Separation of melanic and fulvic andisols

Soil Science and Plant Nutrition, 1988
Abstract It has been recognized in Japan and Alaska that vegetational effects in particular, of grass and forest ecosystems contribute significantly to the formation of melanic and fulvic Andisols, respectively (SHOJI et al. 1988a, b). Although the two Andisols have thick, humus-rich horizons, they indicate remarkable differences in the humus ...
openaire   +1 more source

Relationship between stable carbon and nitrogen isotope ratios of humic acids extracted from Andisols and non-Andisols

CATENA, 2015
Abstract To relate the isotopic composition of soil humic acids (HAs) to their source plants and their degree of humification (as indicated by the degree of darkening), as well as to soil type, we determined the stable isotope ratios for carbon (δ13C) and nitrogen (δ15N) of HAs extracted from 26 virgin soil samples (14 Andisols and 12 non-Andisols ...
Naoya Katsumi, Koyo Yonebayashi, Nobuhide Fujitake, Masanori Okazaki   +3 more
openaire   +1 more source

Nitrate leaching in an Andisol treated with different types of fertilizers

Environmental Pollution, 2003
Nitrate (NO3) leaching was studied in an Andisol treated with four N fertilizers (SC: swine compost, CU: coated urea, AN: ammonium N, or NF: no fertilizer) for 7 years. Sweet corn (Zea mays L.) was grown in summer, followed by Chinese cabbage (Brassica rapa L. var. amplexicaulis) or cabbage (Brassica oleracea L. var. capitata) in autumn each year.
Morihiro, Maeda, Bingzi, Zhao, Yasuo, Ozaki, Tadakatsu, Yoneyama   +3 more
openaire   +2 more sources

Morphology, Chemistry, and Mineralogy of Isotropic Aluminosilicate Coatings in a Guadeloupe Andisol

Soil Science Society of America Journal, 1994
Abstract Few micromorphological and in situ submicroscopical studies exist of neoformed amorphous and crystalline clay coatings, and little is known about the genesis and distribution patterns of these coatings and their dependence on site conditions.
Jongmans, Ag, van Oort, Folkert, F., Buurman, P., Jaunet, A.M., van Doesburg, J.D.J.   +4 more
openaire   +3 more sources

Predictive Models for Selected Chemical Properties of Andisols

Soil Survey Horizons, 2001
Particle size and chemical properties are important in interpretations for many soils. In this study, statistical models developed from field textures, or apparent textures, and simple chemical tests predict the commonly measured chemical properties of Andisols.
W. D. Nettleton, S. H. Brownfield, E. C. Benham, R. Burt, K. Hipple, C. L. McGrath, H. R. Sinclair   +6 more
openaire   +1 more source