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Changes in soil water retention due to soil kneading
Agricultural Water Management, 2005Abstract Soil water retention curves (WRCs) are required to predict the availability of water to plants and the movement of water through the soil. Soil kneading by hand is a type of extreme structure disturbance which is comparable to mechanical breakdown of soil structure by cattle trampling, tillage and wheeling of heavy machinery, especially when
J. Fernández-Gálvez, E. Barahona
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Soil Science Society of America Journal, 2005
Knowledge of soil water retention is fundamental to quantify the flow of water and dissolved substances in the subsurface. Water retention is often quantified with models fitted to observed retention points. Interpretation and conversion of parameters from different models is subjective and prone to error. We examined 461 retention
Haverkamp, Randel +4 more
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Knowledge of soil water retention is fundamental to quantify the flow of water and dissolved substances in the subsurface. Water retention is often quantified with models fitted to observed retention points. Interpretation and conversion of parameters from different models is subjective and prone to error. We examined 461 retention
Haverkamp, Randel +4 more
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Water Retention Measurement for Soils
Journal of the Irrigation and Drainage Division, 1980A method for rapidly obtaining water retention data for soils is presented. A variation of the Richard’s pressure cell is used in which equilibrium at a particular water content is achieved by adjustment of the outflow pressure, rather than by permitting equilibrium to be reached at a fixed increment of water pressure.
Charles Su, Royal H. Brooks
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Soil aggregates and water retention
2004Publisher 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 +3 more
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2018
Soil/water retention curve (SWRC) is the relationship between soil/water matric potential and volumetric soil-water content at equilibrium above the reference (zero) level represented by the free water table at atmospheric pressure. SWRC is the basic soil characteristic needed as input data for simulation models. SWRCs have a hysteresis-like character,
Viliam Novák, Hana Hlaváčiková
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Soil/water retention curve (SWRC) is the relationship between soil/water matric potential and volumetric soil-water content at equilibrium above the reference (zero) level represented by the free water table at atmospheric pressure. SWRC is the basic soil characteristic needed as input data for simulation models. SWRCs have a hysteresis-like character,
Viliam Novák, Hana Hlaváčiková
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The role of stones in soil water retention
European Journal of Soil Science, 2002Summary Do stones modify the pore space in soil directly, or do they interact with the fine earth fraction? The contribution of each of these phases to porosity and water retention was analysed in mixtures of glass fragments < 6 mm with a silty‐clay soil and a clay soil in the 10–80 ...
Fiès, J.C. +2 more
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Soil organic matter and water retention
Agronomy Journal, 2020AbstractThe current and projected anthropogenic global warming and the attendant increase in the severity and extent of soil degradation may exacerbate the intensity and duration of drought occurrence in agroecosystems. Restoration of the soil organic matter (SOM) content of degraded/depleted soils can increase soil water retention (SWR) more at field ...
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Water Retention by Soils Containing Coal
Soil Science Society of America Journal, 1993Abstract Soil water retention and transport functions are needed to model infiltration and redistribution of water in reclaimed mineland profiles. Besides primary particles of sand, silt, clay, and rock fragments, some mineland soil profiles in west‐central North Dakota also contain lignite coal fragments ranging in sizes from <1 ...
P. P. Sharma +2 more
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Fractal processes in soil water retention
Water Resources Research, 1990Numerous empirical models exist for soil water retention and unsaturated hydraulic conductivity data. It has generally been recognized that the empirical fitting coefficients in these models are somehow related to soil texture. However, the fact that they are empirical means that elaborate laboratory experiments must be performed for each soil to ...
Scott W. Tyler, Stephen W. Wheatcraft
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Estimating Soil Water Retention from Soil Properties
Journal of the Irrigation and Drainage Division, 1982Soil water retention characteristics are needed to describe the movement and storage of water in soils. Since conventional laboratory methods of obtaining these are expensive and time consuming, a method of estimating soil water retention at various matric potentials from readily available soil properties was investigated.
Walter J. Rawls, D.L. Brakensiek
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