Results 161 to 170 of about 149,416 (211)

Fractal Fragmentation, Soil Porosity, and Soil Water Properties: I. Theory

Soil Science Society of America Journal, 1991
Abstract Recent efforts to characterize soil water properties in terms of porosity and particle‐size distribution have turned to the possibility that a fractal representation of soil structure may be especially apt. In this paper, we develop a fully self‐consistent fractal model of aggregate and pore‐space properties for structured ...
Michel Rieu, Garrison Sposito
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Soil Gas Permeability as Influenced by Soil Gas‐Filled Porosity

Soil Science Society of America Journal, 1992
Abstract The need to characterize the fundamental gas flow properties of soils has taken on new significance in recent years with the advent of induced soil venting as a remediation technique for contaminated soils.
Kevin P. McCarthy, Kirk W. Brown
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Estimating Saturated Hydraulic Conductivity from Soil Porosity

Transactions of the ASAE, 2001
Measuring the tempospatial variability of saturated hydraulic conductivity (Ks ) is time consuming, expensive, and encounters many uncertainties. This work aimed to develop a new model (REPM, Relative Effective Porosity Model) that estimates Ks from relative effective porosity (er ) and then compare it with a model (EPM, Effective Porosity Model ...
null A. A. Suleiman, null J. T. Ritchie
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Porosity and Soil‐Water Diffusivity Relations

Soil Science Society of America Journal, 1963
Abstract Water at −2mb pressure was absorbed by horizontal columns of three soil materials of differing texture each at three porosities, each porosity in duplicate. The soil materials were Adelanto loam, Pachappa loam, and Pine silty clay.
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Relationships between soil porosity, root development and soil enzyme activity in cultivated soils

Geoderma, 1993
Abstract Porosity and pore size distribution from thin sections, prepared from undisturbed Ap horizon samples taken from a zero- versus conventional-tillage field experiment, were analysed by means of a Quantimet 720 image analysing computer. The length and the size distribution of plant roots were determined using the same image analyzer.
Marcello Pagliai, Maria De Nobili
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Analysis of porosity in a tilled “crusting soil” in Zimbabwe

Geoderma, 1993
Abstract Samples were collected in a tilled “crusting soil” from zones with different structures and their porosity was analysed with mercury porosimetry. The results showed three types of elementary pore volumes that differ in both the size and origin of the pores.
Bruand A, D'Acqui LP, Nyamugafata P, Darthout R, Ristori GG   +4 more
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CHANGES IN SOIL POROSITY IN REMOLDED SOILS TREATED WITH POULTRY MANURE

Soil Science, 1987
We studied the modification induced in soil porosity, pore shape, and pore-size distribution in three soils of different textures treated with a poultry manure in laboratory trials, and we tested the effect of wetting and drying cycles. Porosity measurements were carried out on soil thin sections by using the electrooptical image-analysis (Quantimet ...
M. PAGLIAI, M. LA MARCA, G. LUCAMANTE
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Soil Hardness Measurements in Relation to Soil Moisture Content and Porosity

Soil Science Society of America Journal, 1952
Abstract A method of adjusting penetrometer measurements so as to express soil porosity conditions is presented. The best simple function giving high correlations with macroporosity in the Decatur clay and the sandy clay subsoil of Greenville fine sandy loam was log (ϑH 1/2 )
V. C. Jamison, H. A. Weaver
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Backscattered Electron Scanning Images of Soil Porosity for Analyzing Soil Compaction around Roots

Soil Science Society of America Journal, 1996
Abstract Thin sections of soil surrounding maize roots were studied in scanning electron microscopy using the backscattered electron mode. The soil is a fine‐loamy, mixed, mesic, Typic Eutrochrept. Backscattered electron scanning images (BESI) of the porosity surrounding a selected maize ( Zea ...
Bruand, Ary, Cousin, Isabelle, Nicoullaud, Bernard, Duval, Odile, Bégon, Jean-Claude   +4 more
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The porosity of soil aggregates from bulk soil and from soil adhering to roots

Plant and Soil, 1985
Total porosity and pore-size distribution (p.s.d.) were determined in soil aggregates taken in plots planted with maize and treated with farmyard manure and three rates of compost. Soil aggregates were collected from the soil adherent to the maize roots (root soil aggregates) and from bulk soil (bulk soil aggregates).
G. Guidi, G. Poggio, G. Petruzzelli
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