Showing papers in "Geoderma in 1972"

TL;DR: In this paper, a sequence of soils developed under different climatic conditions has been investigated micromorphologically to study the evolution of the pedogenic calcite formations in the Indo-Gangetic plain (India).

TL;DR: In this article, the results of these studies indicate that short term exposures of clay minerals to humic acids yield mainly physically bound organo-clay complexes while some chemisorbed bonding takes place through carboxyl groups.

TL;DR: In this article, the results are consistent with the prediction of crystal field theory, that elements with higher crystal field stabilization energies will displace manganite from the surface layers of the manganese oxides.

TL;DR: In this paper, a minimum chord control device enables to measure the features in several diameter classes, and a closed-circuit monitor, a detector unit and a computer are used to detect void complexes.

TL;DR: There are two distinct levels of interpretation of most soil fabric features: the relatively simple interpretation that certain constituents have been concentrated or rearranged, and the more difficult interpretation of the details of the chemical and physical processes and conditions under which these concentrations and rearrangements have occurred.

TL;DR: In this paper, two complex profiles in slope deposits in Galicia, Spain, were examined both in the field and in the laboratory, and the shortcomings of existing systems of soil horizon nomenclatures and classification schemes of slope deposits became very evident.

TL;DR: In this paper, the major exotherm for untreated fulvic acid, signalizing the decomposition of the nucleus, occurred at 450° C, while for metal-fulvic acid with monovalent ions, the main exotherms tended to decrease as the size of the metal ion increased.

TL;DR: In this paper, the authors evaluated the micromorphological properties of basaltic soils from Nicaragua and compared these changes with other physico-chemical properties, including changes in plasmic fabric with respect to pedogenesis.

TL;DR: In this paper, it is proved that an important number of intermolecular interactions can be reduced to charge-transfer progresses and many properties and patterns of humic substances are derived from the formation of electron-donor and acceptor complexes between these materials as with non-humic substances.

TL;DR: In this paper, the replacing efficiency of H-ion for exchangeable cations is expressed by the quotient ΔM/ΔH, ΔM meaning replaced amount of M by added ΔH of acid.

TL;DR: In this article, the authors investigated the development of five soils in basalt flows of ages ranging from 6,200 to about 4 million years in Victoria, Australia in conjunction with a radioisotope retention study reported elsewhere.

TL;DR: Gel-filtration of humic and fulvic acid with Sephadex G-50 yielded low and high molecular weight fractions with different chemical and spectral characteristics as discussed by the authors.

TL;DR: In this paper, the use of selective dissolution and difference infrared spectroscopy has been studied as a means of quantitative determination of amorphous constituents in volcanic-ash soil clays.

TL;DR: In this paper, the effects of different experimental conditions on the ESR spectra of a number of humic substances were examined, including no pretreatment vs. hydrolysis with 6N HCl, running samples as powders vs. in 1N NaOH solution, the presence and absence of oxygen, analyzing samples at room temperature and at -196°C, and decreasing the modulation and microwave power.

TL;DR: In this paper, total manganese was determined in soils and soil clays from catenary sequences on basalt, dolomite and limestone, including Terra Rossa, Brown Mediterranean, Krasnozem, Grumusol, and Lithosolic soils.

TL;DR: In this paper, a vertical section, 12 m deep, in Permian phyllites was examined with the aim of studying the changes which take place in the mineral suite on weathering of the phyllite from fresh rock to the weathered material existing as shaly chips in the surface soil.

TL;DR: An automatic, highly sensitive instrument for the continuous measurement of vertical expansion and shrinkage has been erected in a montmorillonitic grumusol pedon in a wet-dry Mediterranean climate (Akko, Israel).

TL;DR: The morphological characteristics of the soils are closely related to the moisture and temperature regimes in different parts of the profile as mentioned in this paper, which have resulted in distinct local sorting of materials within layers, poorly expressed indications of downward migration of substances, and limited evidence of the destruction and synthesis of substances.

TL;DR: In this article, selected horizons of three present-day New Zealand soils and paleosols underlying them were studied, using standard soil chemical and mineralogical methods of the New Zealand Soil Bureau and a sensitive amino acid method.

TL;DR: In this article, the long-term effects of two cropping systems and of manure, fertilizer and lime treatments on products resulting from the permanganate oxidation of humic acids extracted from a gray wooded soil were investigated.

TL;DR: In this paper, individual horizons of a number of profiles were sampled for micromorphological study and no clay films were observed in thin sections representing the B-horizons free in carbonate.

TL;DR: Luvisolic soils (Alfisols) developed in calcareous glacial till in cold continental subhumid, moderately warm continental humid and moderately cool perhumid regions of Canada were compared as discussed by the authors.

TL;DR: In this paper, three soil profiles derived from Pleistocene eolian loess were compared according to their micromorphological properties, which are expressed by differentiation of horizons and by their micro-morphological properties.

TL;DR: Chrysotalunin, a hydroxybianthraquinone has been found in 27 Irish soils and in 1 Canadian soil, or approximately in 1 of every 30 soil samples examined.

TL;DR: In this article, the response to K by potted millet (Pennisetum spp.) and sorghum (S. vulgare) was determined in soils taken from nine soil groups in twenty locations in Eastern Nigeria and correlated with K extracted with five laboratory methods.

TL;DR: In this article, the shape, size and smoothness of Kankar nodules are somewhat dependent on the texture of the soils, which is controlled by the hematite and limonite, which are the sources for iron and manganese.

TL;DR: In this article, the clay fraction of volcanic-ash derived soils was isolated using an ultrasonic vibration technique and the isolated fraction was analyzed for allophane, iron, and amorphous aluminum and silicon compounds and each of these types of compounds then removed.

TL;DR: In this article, it was shown that thermal gradients in the upper soil layer, changing parallel to the surface production flux of carbon dioxide, may be responsible for this production cycle.