Processes driving soil solution chemistry in a flooded rice-cropped vertisol: analysis of long-time monitoring data

Boivin, Pascal; Favre, Florent; Hammecker, Claude; Maeght, Jean‐Luc; Delarivière, Jean Larvy; Poussin, Jean-Christophe; Wopereis, M.C.S.

doi:10.1016/s0016-7061(02)00226-4

Cited by 71 publications

(45 citation statements)

References 23 publications

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“…In soils with higher CEC, this process tends to be stimulated. Boivin et al (2002), for example, noted an increase in EC from 0.3 to 1.2 dS m -1 , during a rice cycle in a Vertisol, richer in cations than the Albaqualf used in this study. However, these authors studied an African region characterized by a negative annual water balance (2,000 mm), with average rainfall of 280 mm in the rainy season (July-October) during the rice cycle.…”

Section: Ion Dynamics In Soil Solution and Plant Uptakementioning

confidence: 42%

“…Solo, 34:1851Solo, 34: -1863Solo, 34: , 2010 uptake, or by modifications in the rhizosphere, mainly by oxygen flow in the aerenchyma and Fe 3+ precipitation in the roots (Silva et al, 2003). Grattan et al (2002), Boivin et al (2002) and Schoenfeld et al (2007) reported an increase in salinity in the surface layer to a depth of 10 cm, as an effect of evapoconcentration. Several factors may affect these dynamics, e.g., soil texture, CEC, soil porosity and depth of the impermeable layer, as well as the experimental environment.…”

Section: Introductionmentioning

confidence: 99%

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Cation dynamics in soils with different salinity levels growing irrigated rice

Carmona

Anghinoni

Holzschuh

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYSalinity levels in soils of the Outer Coastal Plain of Rio Grande do Sul, Brazil, can be high, due to excess of Na in the irrigation water, evapotranspiration and soil development from marine sediments. The cultivation of irrigated rice could be an alternative, since ion uptake as well as leaching by the establishment of a water layer could mitigate the effects of soil salinity. This study aimed to evaluate the dynamics of basic cations in the solution of Albaqualf soils with different salinity levels growing irrigated rice. The plow layer contained exchangeable Na percentages (ESP) of 5.6, 9.0, 21.2 and 32.7 %. The plant stand, dry matter, Na, K and Ca + Mg uptake at full flowering and grain yield were evaluated. The levels of Na, K, Ca + Mg and electrical conductivity (EC) in the soil solution were also measured weekly during the rice cycle at four soil depths, in the water layer and irrigation water. The Na, K and Ca + Mg uptake by rice at full flowering was used to estimate ion depletion from the layer under root influence. Soil salinity induced a reduction in the rice stand, especially in the soil with ESP of 32.7 %, resulting in lower cation uptake and very low yield at that site. As observed in the water layer and irrigation water, the Na, K, Ca + Mg and EC levels in the soil solution decreased with time at depths of 5, 10 and 20 cm, regardless of the original soil salinity, showing that cation dynamics in the plow layer was determined by leaching and root uptake, rather than by the effect of evapoconcentration of basic cations in the soil surface layer.Index terms: exchangeable sodium percentage, potassium, calcium, magnesium, electrical conductivity.(

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Section: Ion Dynamics In Soil Solution and Plant Uptakementioning

confidence: 42%

Section: Introductionmentioning

confidence: 99%

Cation dynamics in soils with different salinity levels growing irrigated rice

Carmona

Anghinoni

Holzschuh

et al. 2010

Rev. Bras. Ciênc. Solo

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“…Arsenic, with As(V) being the stable form in well-aerated soils shows a low solubility [21], because As(V) is strongly adsorbed on most mineral constituents such as iron or aluminum (hydr)oxides and aluminosilicates [22] (Figure 1). Under reducing conditions (paddy soil), oxygen is depleted since oxygen diffusion in water is four orders of magnitude lower than those in air [23][24][25]. Arsenate is reduced to As(III) readily, becoming the dominant form [26][27][28], and As becomes more mobile in soil solution due to the increased concentration of As(III).…”

Section: Abiotic Factors Influencing the Speciation And Mobility Of Amentioning

confidence: 99%

Effects of microbial processes on the fate of arsenic in paddy soil

2012

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Arsenic (As) is a metalloid toxic to organisms including humans. Arsenic in rice represents a significant exposure pathway for the general population, particularly for those subsisting on rice. Arsenic transformation, namely reduction, oxidation and methylation, in soil-rice systems has fundamental impacts on its mobility and toxicity. In addition to soil chemical properties (pH, Eh, metallic oxides, organic matter), microorganisms play critical roles in As transformation and mobility in paddy soil, such as through ArsM (As(III) S-adenosylmethyltransferase) and interactions with iron oxides or organic matters. Arsenic species in paddy soil directly influence As speciation in rice grain because the methylated As species in rice are mainly derived from microbial methylation in paddy soil. This paper aims to provide an overview on the status of the knowledge and gaps on the chemical aspects of As transformation in soil-rice system in conjunction with microbial ecology and functional genes. In addition, potential pathways (manipulation of microorganisms in paddy soil and genetic engineering) to decrease total As and/or inorganic As in rice grain are proposed.

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Section: Introductionmentioning

confidence: 99%

“…Furthermore, infiltration can potentially be blocked by air entrapment due to surge flooding and shallow water table [15]. Boivin et al [15] noted that if the downward water transfer is blocked under flooded conditions, then solutes supplied by the irrigation water may accumulate in the top soil. Wopereis et al [16] demonstrated that the salinity level of the topsoil of rice-fields was decreased, because salts from the topsoil were gradually transferred downward by infiltration while infiltration blocked the upward transport of salts from the water table.…”

Section: Introductionmentioning

confidence: 99%