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Phosphate adsorption and desorption studies provide insight for developing P management strategies. Very few studies have concentrated on P desorption which provides information on the reversibility of adsorbed P. Phosphate adsorption and desorption studies were carried out on seven rice-growing soils from three countries in West Africa, with the objective of relating these processes to P management...
The impact of the surface properties of Fe oxides formed both in the absence and the presence of citric acid at the citrate concentration of 10 -5 M on their kinetics and mechanisms of Pb sorption was investigated by using pressure-jump relaxation spectrometry. The adsorption edge of Pb on these two Fe oxides can be described by the modified triple layer model (TLM) using the FITEQL program...
The effects of the inoculation of two fluorescent Pseudomonas strains (P. mendocina and Pseudomonas sp.) on the soil aggregation in the rhizosphere have been tested. Their indirect effects on the conservation of spores of Pasteuria penetrans, a bacterial endospore-forming parasite of plant-parasitic nematodes Meloidogyne spp., and on the infection of Meloidogyne javanica juveniles were investigated...
Knowledge about cation and anion exchange and pH buffering in soils is essential for developing an efficient nutrient management system, especially in tropical soils where nutrient retention capacity may be low. Sorption characteristics and pH buffering of an Amazonian Ultisol were studied in sequential batch experiments. The objective was to gain additional information on the cation and anion exchange...
Pedological soil surveys usually based on auger sampling encounter methodological and economic difficulties. Electrical resistivity (ER) techniques could be used as a simple and practical method to determine their spatial variability. However, attempts to map soils using ER techniques have very often limited success, especially in bottomland areas, due to large variations inherent in ground data....
The aim of this study was to determine the impact of the interactions between different earthworm species on the individual burrowing activity and especially on the characteristics of burrow systems. Towards this end, individuals of different earthworm species (Lumbricus terrestris, Aporrectodea giardi, A. caliginosa) were inoculated as single or paired species treatments into artificially packed...
In this paper, we compare different types of patterns that emerge when applying methylene blue dye as a tracer on soils to detect preferential flow paths as a result of large cracks. Patterns on channels, vughs and cracks are analyzed with the J-function and with indicator variograms. By means of a combined analysis, we obtained a better understanding of the patterns as well as some clear indications...
A non-parametric approach for assessing the probability that heavy metal concentrations in soil exceed a location-specific environmental threshold is presented. The methodology is illustrated for an airborne Cd-contaminated area in Belgium. Non-stationary simple indicator kriging, using a soft indicator coding to account for analytical uncertainty, was used in combination with declustering weights...
To quantify the gradient of plant-available nutrients on high-elevation coastal sites that support growth of Pacific silver fir (Abies amabilis (Dougl. ex Loud.) Forbes) in southern British Columbia, we collected samples of forest floor and mineral soil (0-30 cm) from montane and subalpine sites within maritime-windward, maritime-leeward, submaritime, and subcontinental climatic strata. The samples...
Extensive deforestation of natural forests in the Ethiopian highlands and their conversion to low-input agriculture and plantations have caused severe soil degradation and significant changes in the ecosystem. We investigated the influence of land use changes on the amount, form and distribution of sulfur (S) in bulk soils and size separates of the sub-humid highlands of southern Ethiopian. Surface...
Soils and landscapes are subject to historical and spatial contingency, leading to locally unique pedologic features. This can make broad-scale generalizations difficult, impractical, or even impossible. The development of vertical texture-contrast soils with argillic horizons, for example, is potentially subject to all general forms of spatial and historical contingency. A case study in east Texas...
Humic acid (HA) participates in a variety of electron transfer reactions, but its fundamental redox properties, such as formal electrode potential and oxidation capacity, are not well characterized. Specific functionalities in HA, such as semiquinone free radicals, have been hypothesized to participate in redox reactions; however, few supportive data exist. To address these issues, three standard...
The paper reviews eight well-known and accepted pedo-transfer functions used for evaluation of soil hydraulic conductivity (saturated and unsaturated) from routinely available soil data. A comprehensive data set containing detailed measurements of 63 German soil horizons, to which none of the models had been previously calibrated, were used for the evaluation of pedo-transfer functions. The paper...
Soil phosphorus pools vary due to changes in the stability of organic matter and secondary Fe and Al oxyhydroxides and non-crystalline aluminosilicate minerals along a climosequence sampled from 85 to 505 cm of annual rainfall in Hawaii. Observations of soil morphology and monthly Eh measurements demonstrate that as annual rainfall increased so does the intensity and duration of reducing conditions...
Reclaimed mine soils in Lusatia/Germany are heterogeneous sandy sediment mixtures, which often contain significant portions of lignite (brown coal). Water-repellent aliphatic organic compounds may cause preferential finger-type flow in mine soils. The objective of this study was to analyse the significance, spatial scales, and spatial variability of potential water repellency in a lignitic mine soil...
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