Results 211 to 220 of about 22,259 (263)

Porosity and soil water properties of Caribbean volcanic ash soils

Soil Use and Management, 2000
Abstract. Volcanic ash soils are generally recognized as soils with excellent and stable physical properties. Here we characterized the porosity and water properties of volcanic ash Andosols and Nitisols from Guadeloupe in contrasting banana systems: (1) perennial crop without mechanization, (2) mechanized and ...
Dorel, M., Roger-Estrade, J., Manichon, H., Delvaux, Bruno   +3 more
openaire   +3 more sources

Fractal Fragmentation, Soil Porosity, and Soil Water Properties: II. Applications

Soil Science Society of America Journal, 1991
Abstract The fractal model of Rieu and Sposito contains seven predictive equations that can be tested experimentally with data on aggregate characteristics and soil water properties for structured soils. However, data with which to test the model are extremely limited at present because of the need to have precise, concurrent ...
Michel Rieu, Garrison Sposito
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source