The rhizosphere and plant nutrition: a quantitative approach

Darrah, P. R.

doi:10.1007/978-94-011-1880-4_1

Cited by 74 publications

(62 citation statements)

References 102 publications

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“…The rhizosphere has been defined as the zone of soil surrounding the root that is influenced by root processes (Darrah, 1993). The cylinder of soil that is influenced by such processes as nutrient diffusion and mass flow, root exudates, micro-organism activity and root uptake can vary from 1-2 mm to several cm from the root surface.…”

Section: Rooted Plantsmentioning

confidence: 99%

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

Twiss

Errécalde²,

Fortin

et al. 2001

Chemical Speciation & Bioavailability

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Chemical Speciation and Bioavailability (2001), 13(1) ABSTRACTThe bioavailability and toxicity of a dissolved metal are closely linked to the metal's chemical speciation in solution. A variety of inorganic and organic ligands are often used in laboratory toxicity tests to control the concentration of labile trace metal in solution. Computerised chemical speciation models based on thermodynamic principles can be used to estimate metal speciation under such experimental conditions. However, these models are sensitive to the quality of their thermodynamic databases. Detailed protocols for the incorporation of reliable equilibrium formation constants into widely available computer chemical speciation programs (e.g., MINEQL+ and MINTEQ) are provided. The examples demonstrate both the benefits and the potential pitfalls involved in the use of chemical speciation models. The application of chemical speciation modelling to metal toxicity studies is discussed and guidelines are proposed for its proper use. Both defined media and chemical speciation programs have co-existed for two decades but the combined use of these techniques has been reserved for those possessing in-depth knowledge of both chemistry and biology. The techniques presented should enable an investigator with basic biological, chemical and computing skills to design an aqueous medium and incorporate correct thermodynamic constants into a computer chemical speciation program, starting from a standardised database, thereby providing a sound framework for critically assessing the biological response of a particular test organism to a given metal.

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Section: Rooted Plantsmentioning

confidence: 99%

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

Twiss

Errécalde²,

Fortin

et al. 2001

Chemical Speciation & Bioavailability

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“…[5,6] Different plant species [7,8] or genotypes within a species [9] can influence microbial populations and species composition of the microbial community in the rhizosphere to different extents. It is often assumed that differences in the composition of microbial populations are due to quantitative and=or qualitative differences in root exudation.…”

Section: Introductionmentioning

confidence: 99%

Iron Nutrition of Peanut Enhanced by Mixed Cropping with Maize: Possible Role of Root Morphology and Rhizosphere Microflora

Zuo

Liao

Cao

et al. 2003

Journal of Plant Nutrition

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“…Physico-chemical processes between soil and roots generally differ from the processes outside the rhizosphere (Darrah 1993). Changes in nutrient dynamics in the plant rhizosphere were intensively studied for phosphorus (Gahoonia and Nielsen 1992, Zoyza et al 1997), nitrogen, potassium, calcium and magnesium (Moritsuka et al 2000).…”

mentioning

confidence: 99%

Crop influence on mobile sulphur content and arylsulphatase activity in the plant rhizosphere

Kotková¹,

Balík²,

Černý³

et al. 2008

PLANT SOIL ENVIRON

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The changes of mobile sulphur (S) contents were investigated in the plant rhizosphere using precise model experiments with rhizoboxes. The tested plants were winter wheat (Triticum aestivum L.), winter rape (Brassica napus L.) and white lupine (Lupinus albus L.). In this experiment, a Cambisol from a precise field experiment treated with sewage sludge or manure was used. Total extractable S concentration and mineral S (S-SO 4 2-) concentration in the water extract were higher in the plant rhizosphere (< 6 mm from the root) compared to the so-called bulk soil (> 6 mm). The contents of total extractable S 0 decreased in order: lupine (5-35 mg/kg) > rape (4-18 mg/kg) > wheat (1.5-3 mg/kg). The same order was observed for mineral S-SO 4 2-where the contents in soil extracts were 1-10 mg/kg, 2-7 mg/kg, and 0.5-3 mg/kg, respectively. The highest total extractable S and mineral S (S-SO 4 2-) contents were found in the treatments fertilized with organic fertilizers. In the case of rape and wheat the arylsulphatase (ARS) activity was higher in the rhizosphere compared to the bulk soil; the opposite was recorded for lupine. It was acknowledged that the ARS activity was higher in the treatments fertilized with organic fertilizers (manure or sewage sludge) with all three tested plants. The highest determined ARS activity was found after wheat cultivation, the lowest after the lupine cultivation. The organic sulphur content followed an opposite tendency (lupine > rape > wheat).

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The rhizosphere and plant nutrition: a quantitative approach

Cited by 74 publications

References 102 publications

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

Iron Nutrition of Peanut Enhanced by Mixed Cropping with Maize: Possible Role of Root Morphology and Rhizosphere Microflora

Crop influence on mobile sulphur content and arylsulphatase activity in the plant rhizosphere

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