Changes of pH across the rhizosphere induced by roots

@article{Nye2005ChangesOP,
  title={Changes of pH across the rhizosphere induced by roots},
  author={Peter Hague Nye},
  journal={Plant and Soil},
  year={2005},
  volume={61},
  pages={7-26}
}
  • P. Nye
  • Published 1 February 1981
  • Chemistry
  • Plant and Soil
SummaryPlants that absorb nitrogen as NO3− tend to raise the pH in the rhizosphere. Those absorbing nitrogen as NH4+ or N2 lower the pH. The change in pH near the root surface may be calculated approximately from the H+ or HCO3− efflux and radius of the root; and the pH buffering capacity, moisture content, initial pH and pCO2 of the soil. An accurate equation, solved numerically, also takes account of root hairs, mass flow and slow acid-base reaction in the soil. The pH at the root surface… 
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Citation Type

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The low buffering capacity for soils of pH near 6 seems to be valid for a large number of soils with different properties.
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Increase in solubility of soil aluminium (Al) as a result of root-induced decrease of soil pH was studied. Soil samples of known distances from the roots of NH4-N fertilized Ryegrass were analyzed…
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Douglas-fir, grown on strongly acid soil (pH-H2O 3.87), was fertilized with ammonium, nitrate or ammonium nitrate as N-source. Rhizosphere pH along the root axis was measured with microelectrodes.…
Origins of root-mediated pH changes in the rhizosphere and their responses to environmental constraints: A review
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The aim of the present review is to define the various origins of root-mediated changes of pH in the rhizosphere, i.e., the volume of soil around roots that is influenced by root activities and the response of plant roots to deficiencies of P and Fe and to Al toxicity.
Mobilization of phosphate in different soils by ryegrass supplied with ammonium or nitrate
Mobilization of soil P as the result of plant-induced changes of soil pH in the vicinity of plant roots was studied. Seedlings of ryegrass were grown in small containers separating roots from soil by…
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A method to control the rhizosphere pH of plants under controlled nutritional conditions is suggested. An earlier developed method for plant growth in soilless culture according to the principle of…
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The kinetics of the PO4 exchange between liquid and solid phases of soil were significantly different between rhizosphere and bulk soils, however, the resulting changes in the ability of the soil solid phase to replenish solution PO4 were almost fully explained by the depletion of soil solution P.
A Model of Uranium Uptake by Plant Roots Allowing for Root-Induced Changes in the soil.
TLDR
A sensitivity analysis showed the importance of soil sorption and speciation parameters as influenced by pH and CO2 pressure; and of root geometry and root-induced acid-base changes linked to the form of nitrogen taken up by the root.
Fertilizer Potential of Struvite as Affected by Nitrogen Form in the Rhizosphere
Struvite is increasingly considered a promising alternative to mined phosphorus (P) fertilizer. However, its solubility is very low under neutral to alkaline pH while it increases with acidification.…
How root nutrient uptake affects rhizosphere pH: A modelling study
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