Results 251 to 260 of about 176,766 (307)

Soil aggregates as mass fractals

Australian Journal of Soil Research, 1995
Soil aggregates have a fractal mass. That is, they are porous and, as they are studied in greater detail, more pores may be observed. Mass fractals have scale-dependent bulk density. Larger objects, or soil aggregates, have a smaller bulk density. Bulk density in soil studies is sometimes assumed to be constant.
AN Anderson, AB Mcbratney
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Dynamics of Soil Aggregation

1966
Publisher Summary This chapter discusses the factors and mechanisms governing the formation and destruction of water-stable soil aggregates. The formation and degradation of water-stable aggregates comprise a complex interrelationship of physical, biological, and chemical reactions.
R.F. Harris, G. Chesters, O.N. Allen
openaire   +1 more source

Aggregation in swelling clay soils

Australian Journal of Soil Research, 1973
Dry sieving, wet sieving, and aggregate bulk density measurements were used to study the mechanisms of dry aggregate formation in three swelling clay soils. These experiments showed that, for a given soil, a single probability function can be used for all dry aggregate fractions to predict their water stability and the distribution of water stable ...
KJ Coughlan, WE Fox, JD Hughes
openaire   +2 more sources

Soil aggregates and water retention

2004
Publisher Summary This chapter explains the way aggregate-size distributions affect soil water retention from saturation to the wilting point. It uses the van Genuchten approximation of gravimetric water retention data and describes the effects of both aggregate-size distributions and particle-size distributions (PSDs) on parameters of the van ...
A. Guber, Ya. Pachepsky, E. Shein, W.J. Rawls   +3 more
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INCIPIENT FAILURE OF SOIL AGGREGATES

Journal of Soil Science, 1962
Summary A comparison of the rate of wetting of aggregates taken from a virgin and continuously cultivated Red‐brown Earth has been made. The aggregates were placed on a glass sinter which was connected to a horizontal capillary. The rate of water uptake was obtained from the rate of meniscus travel as water was adsorbed from the ...
J. P. QUIRK, C. R. PANBOKKE
openaire   +1 more source

Soil Aggregates — Formation and Stability

1990
The first requirement for the efficient production of most agricultural crops is that sufficient water derived from rainfall or irrigation is accepted by the soil. Otherwise, water is not only wasted, but erosion may result. The second requirement for crops other than rice is that waterlogging does not occur, and that soil aggregates at field capacity ...
W. W. Emerson, D. J. Greenland
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FRACTAL DIMENSION OF SOIL AGGREGATES

Soil Science, 1995
Researchers have used scale-invariant bulk density, ρ, to estimate values of fractal dimension, D, for soil aggregate fragmentation. Justification for this assumption has not been fully explored. The objectives of this study were to compare values of D obtained using (i) scale-invariant and scale-variant ρ and (ii) linear (defined D l ) and nonlinear ...
V. RASIAH, V. O. BIEDERBECK
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Soil aggregates and humus systems

2016
The survey of few main morphological soil aggregates (with intrinsic biological, chemical and physical contents) reveals the existence of different humus systems. Recognizable by naked eyes in the field, each humus system is confined in an ecological frame (climate, vegetation, substrate and soil) and results from a specific process of plants and soil ...
Zanella, Augusto, Ponge, Jean-François, Juilleret, Jérôme, Bernier, Nicolas, Topoliantz, Stéphanie, Blouin, Manuel   +5 more
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Microorganisms and Soil Aggregate Stability

1985
A soil aggregate has been defined as “a naturally occurring cluster or group of soil particles in which the forces holding the particles together are much stronger than the forces between adjacent aggregates” (Martin et al., 1955). The terms soil structure and soil aggregation are often used synonymously, but soil aggregates are the basic units of soil
J. M. Lynch, Elaine Bragg
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Soil Aggregate Stability

Soil Science Society of America Journal, 1951
D. O. Robinson, J. B. Page
openaire   +1 more source