Results 151 to 160 of about 1,772 (193)
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The Influence of Soil Water Matric Potential on the Strength Properties of Unsaturated Soil
Soil Science Society of America Journal, 1970Abstract A study was made of the contribution that matric potential makes to effective stress and therefore the strength properties of two unsaturated soils. From an evaluation of the effective stress parameters C ' and ø', and the unconfined strength, the shear strength ...
John Williams, C. F. Shaykewich
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Soil Water Matric Potential Effects on Aggregate Stability
Soil Science Society of America Journal, 1983Abstract The effect of soil water matric potential (ψ m ) is not considered with most techniques utilized to evaluate aggregate stability. Rather, aggregate stability usually is measured at ψ
P. B. Francis, R. M. Cruse
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Independent Measurement of Matric and Osmotic Potential of Soil Water
Soil Science Society of America Journal, 1969Abstract A technique is described that uses the operating principles of the thermocouple psychrometer and the porous plate apparatus to measure the matric and osmotic potentials of soil water without extraction of a significant amount of soil solution.
J. D. Oster +2 more
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A New Resistance Sensor for Monitoring Soil Matric Potential
Soil Science Society of America Journal, 2007The electrical resistance sensor is an appropriate and inexpensive tool for measuring soil matric potential (ψ). These sensors are widely used in irrigation agriculture. One drawback of the resistance sensors, however, is that the measurements often are not accurate across a wide range of moisture conditions. The objective of this study was to design a
X. L. Xin +3 more
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Plant and Soil, 1994
Computerized equipment to control soil temperature and soil water matric potential, at high soil hydric conditions was developed and evaluated. A series of experiments demonstrated the accuracy and reproducibility of the equipment's performance and its adequacy for the assessment of the inoculum potential of soil-borne pathogens in soils with different
P. J. Oyarzun +3 more
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Computerized equipment to control soil temperature and soil water matric potential, at high soil hydric conditions was developed and evaluated. A series of experiments demonstrated the accuracy and reproducibility of the equipment's performance and its adequacy for the assessment of the inoculum potential of soil-borne pathogens in soils with different
P. J. Oyarzun +3 more
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Matric potential and the survival and activity of a Pseudomonas fluorescens inoculum in soil
Soil Biology and Biochemistry, 1995Abstract The survival and activity of a strain of Pseudomonas fluorescens, chromosomally marked with lux genes, was studied following inoculation into microcosms containing autoclaved or non-autoclaved soil adjusted to matric potentials of −30, −750 and −1500 kPa and incubated for up to 3 months. Viable cell concentrations were determined by dilution
Audrey Meikle +4 more
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Debilitation of conidia of Cochliobolus sativus at high soil matric potentials
Soil Biology and Biochemistry, 1988Abstract Membrane filter envelopes containing conidia of Cochliobolus salivus were buried in a loam soil in tensiometers at 0, −5, −15 and −30 kPa matric potential (ψm) for 0. 7, 14 and 28 days. Controls were fresh conidia harvested on the day of germination testing and dry conidia harvested at the beginning of the experiment.
D OLEARY, J LOCKWOOD
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Controlling soil water matric potential in root disease studies
Canadian Journal of Botany, 1977Soil contained in 5.6 × 2.0 × 10.5 cm Plexiglas soil containers was separated from solutions of polyethylene glycol (PEG) 6000 by a Pellicon ultrafiltration membrane glued over the inside of 3.8-cm-diameter holes in two sides. Flow rate through the membrane was 4.4 ml day−1 cm−2 for a 1.0-bar potential difference across the membrane.
B. D. Wisbey, T. A. Black, R. J. Copeman
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Influence of soil matric potential on the debilitation of oospores of Pythium aphanidermatum
Soil Biology and Biochemistry, 1995Abstract The influnece of soil matric potential on the debilitation of oospores of Pythium aphanidermatum was assessed during incubation in Yanagido sandy loam and Kakamigahara clay loam soil in tensiometers at 0, −1, −5, −10 and −15 kPa ψm over a period of 80 days. Germinability in salts solution and viability in corn meal agar of oospores started
Sachindra Nath Mondal +2 more
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Influence of matric potential and soil compaction on growth of the take-all fungus through soil
Transactions of the British Mycological Society, 1987Growth responses of the take-all fungus, Gaeumannomyces graminis var. tritici , to matric potentials between zero and −0.01 MPa were investigated. Growth was influenced by soil compaction. The range of matric potentials over which the fungus grew well was restricted with increasing bulk density.
O.F. Glenn +3 more
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