Results 231 to 240 of about 20,693 (272)

Sorption of Paraquat on Clay Components in a Taiwan's Oxisol

Journal of Environmental Science and Health, Part B, 2003
The sorption of herbicides in soils is mainly influenced by clay components. The objectives of this study were to evaluate the contribution of clay components on paraquat sorption. The surface soils (0-20 cm) of a Laopi pedon (Fine, mixed, Hyperthermic Typic Hapludox) were separated clays into whole (< 2.0 microm), coarse (0.2-2.0 microm), and fine ...
Zeng-Yei, Hseu, Shih-Hao, Jien, Shuang-Fu, Cheng   +2 more
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Phosphate supplying power of rock phosphates in an oxisol

Plant and Soil, 1980
The P-supplying power of triple superphosphate, three apatitic rock phospates and a calcined aluminum rock phosphate were tested by measuring the quantities of fertilizer P recovered in soybean and in four chemical extractants, after 3-day and 75-day periods of contact between soil and fertilizer.
van Raij, B., van Diest, A.
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Magnetic properties of iron-rich oxisols

Physics and Chemistry of Minerals, 1988
Four occurrences of highly magnetic soil in Brazil have been analysed with a view to identifying the magnetic minerals and quantifying the soil magnetization. Techniques used include X-ray diffraction, X-ray fluorescence and Mossbauer spectroscopy. This approach leads us to identify several ways that these soils, which have spontaneous magnetization in
Jacqueline E. M. Allan, J. M. D. Coey, Mauro Resende, J. D. Fabris   +3 more
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Water fluxes in oxisols: A comparison of approaches

Water Resources Research, 1992
Two approaches to simulating soil water flow were evaluated: a capacity‐type water flow model combined with a plant water uptake model based on the concept of plant‐available water, and a numerical solution to the Richards equation combined with a potential‐driven water uptake model.
I. W. Buttler, S. J. Riha
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Tree growth on a compacted Oxisol

Soil and Tillage Research, 1991
Abstract For a site at Barora, Solomon Islands, assessment was made of survival and growth of Gmelina arborea and Terminalia brassii planted on a heavy clay soil degraded by crawler tractor logging of primary forest and other processes. Experimental paired plots were established in 1981 on six classes of degraded soil and in undisturbed forest as a ...
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On the Measurement of Permanent Charge in Oxisols

Soil Science Society of America Journal, 1983
Abstract It is shown that the method used recently by Tessens and Zauyah to measure net permanent charge in Oxisols, based on a recommendation by Gillman and Uehara, can be justified theoretically without an appeal to diffuse double‐layer theory, or to any other detailed, molecular model of the interfacial region.
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Microstructure and water retention of Oxisols in Thailand

Soil Research, 2005
The moisture characteristics and related pore size distributions of Thai Oxisols were determined for 11 representative pedons. These soils are Kandiustox and Kandiudox located in the North-east Plateau, South-east Coast, and Peninsular Thailand. They are generally acidic (pH 5–6), clayey, have low cation exchange capacity (5–15 cmolc/kg) and have low ...
S. Tawornpruek, I. Kheoruenromne, A. Suddhiprakarn, R. J. Gilkes   +3 more
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Physical properties of a Mollisol, an Oxisol and an Inceptisol

Soil and Tillage Research, 1990
Abstract An Inceptisol (Andept) from Ecuador, an OOxisol (Ustox) from Columbia and a Mollisol (Udoll) from the U.S.A. were studied. The clay in the Andept was >85% amorphous with allophane being predominant. The Ustox contained sesqui-oxides of iron and aluminum and kaolinite, while the Udoll contained hydrous mica, quartz and kaolinite in the clay ...
W.E. Larson, W.A. Padilla
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Soil aggregate hierarchy in a Brazilian oxisol

2002
Light and electron microscopy were used to investigate the applicability of the aggregate hierarchy model of Tisdal and Oades [1] to the micromorphology of the A horizon in a Brazilian Xanthic Hapludox soil under both forest and agricultural crop cover. The arrangement of minerals, amorphous material, organic matter, and biota in aggregates of diameter
G. Vrdoljak, G. Sposito
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Application of Calorimetry to Microbial Biodegradation Studies of Agrochemicals in Oxisols

Journal of Environmental Quality, 2001
ABSTRACTCalorimetry was used to monitor the inhibitory effect caused by the bipyridynium diquaternary salts paraquat, diquat, and phosphamidon on microbial activity in a Red Latosol soil (Oxisol). The thermal effect was recorded on samples composed of 1.50 g of soil, 6.0 mg of glucose, 6.0 mg of ammonium sulfate, and different masses of an inhibitor ...
S A, Critter, C, Airoldi
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