A Microscopic-Scale Model of Soil Water Uptake and Salt Movement to Plant Roots

Hillel, Daniel; Beek, van W.E.A.; Talpaz, Hovav

doi:10.1097/00010694-197511000-00010

Cited by 75 publications

(21 citation statements)

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“…Molz & Remson (1981) classified moisture uptake by plants into two categories. The first category follows a microscopic approach which has contributed significantly to the understanding of the RWU process (Gardner i960;Hillel et al 1975;Hainsworth & Aylmore 1986). The second category follows a macroscopic approach, in which the entire root system is treated as a single unit to sum up the effects of all individual roots (Nimah & Hanks 1975;Afshar & Marino 1978;Molz 1981;Marino & Tracy 1988;Li et al 1999;Wu et al 1999;Vrugt et al 2001;Ojha et al 2009 significant advantages over the microscopic approach (Yadav & Mathur 2008;Yadav et al 2009a;Shankar et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Soil moisture dynamics modeling considering multi-layer root zone

Kumar

Shankar

Jat

2013

Water Science and Technology

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The moisture uptake by plant from soil is a key process for plant growth and movement of water in the soil-plant system. A non-linear root water uptake (RWU) model was developed for a multi-layer crop root zone. The model comprised two parts: (1) model formulation and (2) moisture flow prediction. The developed model was tested for its efficiency in predicting moisture depletion in a non-uniform root zone. A field experiment on wheat (Triticum aestivum) was conducted in the sub-temperate sub-humid agro-climate of Solan, Himachal Pradesh, India. Model-predicted soil moisture parameters, i.e., moisture status at various depths, moisture depletion and soil moisture profile in the root zone, are in good agreement with experiment results. The results of simulation emphasize the utility of the RWU model across different agro-climatic regions. The model can be used for sound irrigation management especially in water-scarce humid, temperate, arid and semi-arid regions and can also be integrated with a water transport equation to predict the solute uptake by plant biomass.

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Section: Introductionmentioning

confidence: 99%

Soil moisture dynamics modeling considering multi-layer root zone

Kumar

Shankar

Jat

2013

Water Science and Technology

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“…In most existing water and nutrient uptake models, each root is assumed to extract water or nutrient in a soil cylinder whose radius is the half mean distance between neighboring roots (Barber, 1984;Brouder and Cassman, 1994;Hillel et al, 1975;Shen Lu and Miller, 1994;Yanai, 1994). It is, therefore, implicitly assumed that roots are vertical and arranged in a regular uniform spatial pattern.…”

Section: Introductionmentioning

confidence: 99%

Evaluation in field conditions of a three-dimensional architectural model of the maize root system: Comparison of simulated and observed horizontal root maps

Pellerin

Pagès²

1996

Plant Soil

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Most existing water and nutrient uptake models are based on the assumption that roots are evenly distributed in the soil volume. This assumption is not realistic for field conditions, and significantly alters water or nutrient uptake calculations. Therefore, development of models of root system growth that account for the spatial distribution of roots is necessary.The objective of this work was to test a three dimensional architectural model of the maize root system by comparing simulated horizontal root maps with observed root maps obtained from the field. The model was built using the current knowledge on maize root system morphogenesis and parameters obtained under field conditions. Simulated root maps (0.45 × 0.75 m) of horizontal cross sections at 3 depths and 3 dates were obtained by using the model for a plant population. Actual root maps were obtained in a deep, bamer-free clay-loamy soil by digging pits, preparing selected horizontal planes and recording root contacts on plastic sheets.Results showed that both the number of cross-sections of axile roots, and their spatial distribution characterized with the R-index value of Clark and Evans (1954), were correctly accounted for by the model at all dates and depths. The number of cross-sections of laterals was also correctly predicted. However, laterals were more clustered around axile roots on simulated root maps than on observed root maps. Although slight discrepancies appeared between simulated and observed root maps in this respect, it was concluded that the model correctly accounted for the general colonization pattern of the soil volume by roots under a maize crop.

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“…Water uptake by plant roots can be considered at two distinguishable-microscopic and macroscopic-scales (Feddes and Raats, 2004;Raats, 2007). Microscopic models simulate water flow into individual plant roots on the a.ssumption that the root acts as a cylindrical sink of finite radius and infinite (Gardner, 1960;Hillel et al, 1975;Molz, 1975;Passioura, 1988) or finite (Aura, 1996;Personne et al, 2003) length. The flow equation (usually diffusion type) is solved for the appropriate boundary conditions (i.e., a given water potential or given water flux) at the soil-root interface and a prescribed water potential at some distance from the root.…”

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confidence: 99%

General Solution for Steady Infiltration and Water Uptake in Strip-Shaped, Rectangular, and Cylindrical Domains

Communar

Friedman

2011

Soil Science Society of America Journal

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Infiltration of water from arrayed, interacting surface water sources (emitters) and extraction of water by plant roots is of interest in the context of trickle irrigation. In this study, steady flows from subsurface or surface point and line sources in laterally confined .soil domains were analyzed on the basis of the linearized Richards equation written in terms of the matric flux potential (MFP). Analytical solutions (Green's functions) were derived tor the problems of three-dimensional infiltration from point sources into confined strip-shaped, rectangular, and cylindrical domains and for two-dimensional infiltration from a line source into a strip-shaped domain. Incorporating these solutions into a coupled source-sink water flow and uptake model enabled analysis of the effects of lateral confinement and various source-sink (emitter-plant) configurations on relative water uptake rates (RWURs). The exact solutions for infiltration into confined strip-shaped and rectangular domains derived in this study confirmed the accuracy of previously presented RWUR results, by superposition of the solutions for equivalent, arrayed point sources (along a single drip line and in an array of parallel drip lines). An equivalent confining cylinder of the same cross-sectional area as a square was found to yield RWURs in excellent agreement with those tor a square confinement. A bidirectional tcctangulat confinement increased the RWURs more than a unidirectional strip-shaped confinement. Among the various simulated emitter-plant configurations, the lowest RWURs were obtained for a configuration of a single plant row irrigated by two lateral drip lines.Abbreviations: MFP, macric flux potential: RWUR, relative water uptake rate. I nfiltration of water from arrayed, interacting (surface or subsurface) water sources (emitters or drip lines) and extraction of water by plant roots is of interest in the context of trickle irrigation because plant water uptake is, naturally, one of the major components of the irrigation water balance (Dasberg and Or, 1999). These processes are critical for normal plant growth and crop yields, and they also greatly affect the flow of water and solutes in soil-plant systems and thus determine the quantity and quality of percolating excess water. Water uptake by plant roots can be considered at two distinguishable-microscopic and macroscopic-scales (Feddes and Raats, 2004;Raats, 2007). Microscopic models simulate water flow into individual plant roots on the a.ssumption that the root acts as a cylindrical sink of finite radius and infinite (Gardner, 1960;Hillel et al., 1975;Molz, 1975;Passioura, 1988) or finite (Aura, 1996;Personne et al., 2003) length. The flow equation (usually diffusion type) is solved for the appropriate boundary conditions (i.e., a given water potential or given water flux) at the soil-root interface and a prescribed water potential at some distance from the root. Although the microscopic approach provides insights into water uptake by plant roots, its application is quite restricted ...

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A Microscopic-Scale Model of Soil Water Uptake and Salt Movement to Plant Roots

Cited by 75 publications

References 0 publications

Soil moisture dynamics modeling considering multi-layer root zone

Soil moisture dynamics modeling considering multi-layer root zone

Evaluation in field conditions of a three-dimensional architectural model of the maize root system: Comparison of simulated and observed horizontal root maps

General Solution for Steady Infiltration and Water Uptake in Strip-Shaped, Rectangular, and Cylindrical Domains

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