Results 101 to 110 of about 625 (126)

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

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

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

Andisols

2022
Thor Thorson, Chad McGrath, Dean Moberg, Matthew Fillmore, Steven Campbell, Duane Lammers, James G. Bockheim   +6 more
openaire   +1 more source

INFLUENCE OF ELECTROLYTE ON CADMIUM INTERACTION WITH SELECTED ANDISOLS AND ALFISOLS

Soil Science, 1997
The adsorption-desorption of cadmium (Cd) as a function of pH, ionic strength, and composition of the electrolyte was examined for four variable charge soils: two Alfisols from Zimbabwe (Mazowe and Bulawayo) and two Andisols from Spain (Realejos=l and Realejos=2).
openaire   +2 more sources

Repeated Bray‐2 extractions of an Inceptisol and an Andisol

Communications in Soil Science and Plant Analysis, 1999
Abstract Bray‐2 extractable phosphorus (Bray2‐P) is commonly used to measure plant‐available P in soil. The pool size of extractable P in the residual soil should be reduced after extraction. Phosphorus, once released with the Bray‐2 solution, is resorbed by the soil during the extraction‐filtration period.
openaire   +1 more source

Improving phosphorus availability in Andisols and Oxisols

2016
Low phosphorus (P) availability limits plant growth in many soils, particularly in Andisols and Oxisols, due to their large content of minerals that strongly sorb P (e.g. Al/Fe oxyhydroxides, allophane). Because of the strong P retention, P fertilizer requirements are high in these soils.
openaire   +2 more sources