Influence of continuous submergence on pH, exchange acidity and pH-dependent acidity in rice soils

Savant, N. K.; Kibe, M. M.

doi:10.1007/bf01372649

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…After 23 DAT, pH dropped from initially 6.8 to 6.0–6.5 at the redoximorphic root–soil matrix interface (Figure S8), potentially caused by protons generated during the precipitation of Fe(III) (oxyhydr)oxides and acidification by the release of plant exudates, chelating agents, or plant-derived organic acid molecules (found to decrease soil pH by up to 2 pH units). , The acidification of the unbuffered artificial rhizosphere proceeded until the end of the growth experiment after 45 DAT (pH 5.0–5.5; Figure S8) and significantly correlated to areas with the highest extent in Fe(III) mineral formation (Figure C and D). The observed pH decrease induced by ROL in our setup has been observed in a similar manner in various wetland soils and was hypothesized to be attributed to ROL-driven Fe(II) oxidation. − These observed changes in soil pH will not only positively affect Fe(III) solubility but also increase Fe(II) half-life times and bioavailability for microbial Fe(II) turnover. However, in natural rice paddy soils, the soil pH buffer capacity would potentially decrease extensive changes in soil pH related to Fe(II) oxidation.…”

Section: Resultssupporting

confidence: 77%

Iron Lung: How Rice Roots Induce Iron Redox Changes in the Rhizosphere and Create Niches for Microaerophilic Fe(II)-Oxidizing Bacteria

Maisch

Lueder

Kappler

et al. 2019

Environ. Sci. Technol. Lett.

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Although water-logged rice paddies are characterized by anoxic conditions, radial oxygen loss (ROL) from rice roots temporarily oxygenates the soil rhizosphere. ROL not only triggers the abiotic oxidation of ferrous iron (Fe(II)) but also provides the electron acceptor for microaerophilic Fe(II)-oxidizing bacteria (microFeOx). Both processes contribute to the formation of ferric (Fe(III)) iron plaque on root surfaces. Redox interactions at single roots have been studied intensively. However, temporally resolved spatial changes of ROL in the entire rhizosphere and the impact on redoximorphic biogeochemistry are currently poorly understood. Here, we show how ROL spatiotemporally evolves and correlates with Fe-redox transformations. Applying noninvasive measurements in a transparent artificial soil, we were able to visualize opposing O 2 and Fe(II) gradients that extend from the root surface 10−25 mm into the rhizosphere. The microoxic zone expanded exponentially in size throughout the entire rhizosphere creating niches for microFeOx. Following iron mineral formation and pH, we show that rootrelated ROL induces iron redox transformations on and around roots and correlates with rhizosphere acidification. These findings highlight the dynamic nature of roots in the rice plant rhizosphere, and our approach spatiotemporally resolved their impact on iron redox chemistry and microbial niche formation in the rice plant rhizosphere.

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Section: Resultssupporting

confidence: 77%

Iron Lung: How Rice Roots Induce Iron Redox Changes in the Rhizosphere and Create Niches for Microaerophilic Fe(II)-Oxidizing Bacteria

Maisch

Lueder

Kappler

et al. 2019

Environ. Sci. Technol. Lett.

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“…The exchange acidity and total acidity of soil increased significantly due to incorporation of rice stubble, irrespective of treatment with yogurt. Increase in exchange acidity but decrease in total potential acidity during three months submergence was reported (Savant and Kibe, 1971). The bottom layer of the soil in the present work remained near saturation throughout the incubation which might have contributed to the observed change in exchange acidity.…”

Section: Forms Of Acidity In Soil At Different Days After Incubationsupporting

confidence: 67%

Nitrogen Mineralization, Forms of Acidity and Fertility Status of a Paddy Soil as Influenced by Rice Stubble Management

Nandi¹,

Medhi²,

Barua³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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The productivity of winter rice in Assam has remained static during last decade (Anonymous, 2019) contrast to increase in high yielding variety acreage and total fertilizer consumption. Application of mineral fertilizer without organic manure or recycling of crop residues strongly affects soil productivity (Singh et al., 2001). The stubble management, which is left in the field till the next crop, in rice sole crop areas of the state deserves relook mainly for two reasons. First, simple and feasible rice stubble management

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“…Chemical degradation in water bodies seemed to be pH dependent (http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=P1008R8C.pdf). In the soil, flooding irrigation resulted in gradual stabilization of pH around the neutral range . Therefore, differences in soil pH among soils would be minimized in the saturation treatments.…”

Section: Resultsmentioning

confidence: 99%

Soil residue analysis and degradation of saflufenacil as affected by moisture content and soil characteristics

et al. 2013

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Influence of continuous submergence on pH, exchange acidity and pH-dependent acidity in rice soils

Cited by 5 publications

References 8 publications

Iron Lung: How Rice Roots Induce Iron Redox Changes in the Rhizosphere and Create Niches for Microaerophilic Fe(II)-Oxidizing Bacteria

Iron Lung: How Rice Roots Induce Iron Redox Changes in the Rhizosphere and Create Niches for Microaerophilic Fe(II)-Oxidizing Bacteria

Nitrogen Mineralization, Forms of Acidity and Fertility Status of a Paddy Soil as Influenced by Rice Stubble Management

Soil residue analysis and degradation of saflufenacil as affected by moisture content and soil characteristics

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