Silicon-rich amendments in rice paddies: Effects on arsenic uptake and biogeochemistry

Limmer, Matt A.; Mann, Jessica N.; Amaral, Douglas Carvalho; Vargas, Rodrigo; Seyfferth, Angelia L.

doi:10.1016/j.scitotenv.2017.12.207

Cited by 97 publications

(72 citation statements)

References 46 publications

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“…Soil, porewater, Fe plaque, and rice grain data was synthesized from several previously published pot and field studies utilizing four rice (Oryza sativa L.) cultivars [34,36,38,46], and we complement these data with additional soil characterization and additional years of data from the field study [36].…”

Section: Experimentation and Sample Collectionmentioning

confidence: 99%

“…Prior to rice growth, soils were amended with one of several Si sources: calcium silicate (Silicate), rice husk (Husk), charred rice husk (Char) or rice husk ash (Ash). Char and Ash differed in that Char was prepared by burning rice husk at a lower temperature than Ash, resulting in less crystallization of the Si [36]. In each experiment, Control soils were left unamended and Si-rich materials were applied at similar Si rates (1% w/w of amendment, equivalent to 5 Mg Si/ha).…”

Section: Pot Studiesmentioning

confidence: 99%

“…The field study was conducted adjacent to where the soil was collected for the Low As pot study (~5 mg/kg As) and used several of the same Si amendments as the pot studies. Twelve paddies received soil silicon amendments including Control, Silicate, Husk, and Char (amended at 5 Mg Si/ha) and each treatment was conducted in triplicate paddies; details of the experimental design are previously published for 2015 [36]. Here we also include two additional years of data for 2016 and 2017 (n = 36).…”

Section: Field Studiesmentioning

confidence: 99%

“…iAs(III) adsorbs as an outer-sphere complex, which is more easily prone to desorption than iAs(V), which adsorbs as an inner sphere complex and thus more tightly bound. Moreover, the Fe plaque coatings on rice roots are discontinuous [32] and are comprised of a mixture of Fe phases [32][33][34][35][36], which change in response to solution chemistry [34][35][36][37]. Thus, the ability of Fe oxides in Fe plaque to retain As and lower its uptake into rice depends strongly on the biogeochemical conditions of the rice paddy, which affect the composition and quantity of Fe plaque.…”

Section: Introductionmentioning

confidence: 99%

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Si and Water Management Drives Changes in Fe and Mn Pools that Affect As Cycling and Uptake in Rice

Seyfferth

Limmer

2019

Soil Systems

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Arsenic availability to rice is tied to biogeochemical cycling of Fe and Mn in rice soils. Two strategies to minimize As uptake by rice—increasing Si and decreasing water—affect soil Fe and Mn pools. We synthesized data from several soil-based experiments with four rice cultivars across pot and field trials with manipulations of Si, water, or both. Increasing Si alters the mineral composition of Fe plaque more than decreasing water, with the former promoting relatively more ferrihydrite and less lepidocrocite. Nonflooded conditions decrease lepidocrocite but slightly increase goethite compared to flooded rice. Plaque As, which was a mixture of arsenite (15–40%) and arsenate (60–85%), was correlated positively with ferrihydrite and negatively with lepidocrocite and goethite. Plaque As was also positively correlated with F1 and F2 soil As, and F2 was correlated positively with porewater As, total grain As, and grain organic As (oAs). Grain inorganic As (iAs) was negatively correlated with oxalate-extractable Fe and Mn. Our data and multiple linear regression models suggest that under flooded conditions iAs is released by poorly crystalline Fe oxides to porewater mainly as iAs(III), which can either be taken up by the plant, adsorbed to Fe plaque, oxidized to iAs(V) or methylated to oAs. Increasing Si can promote more desorption of iAs(III) and promote more poorly-ordered phases in plaque and in bulk soil. The ultimate effectiveness of a Si amendment to decrease As uptake by rice depends upon it being able to increase exogenous Si relative to As in porewater after competitive adsorption/desorption processes. Our data further suggest that poorly crystalline Fe and Mn soil pools can retain inorganic As and decrease plant uptake, but these pools in bulk soil and plaque control grain organic As.

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Section: Experimentation and Sample Collectionmentioning

confidence: 99%

Section: Pot Studiesmentioning

confidence: 99%

Section: Field Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Si and Water Management Drives Changes in Fe and Mn Pools that Affect As Cycling and Uptake in Rice

Seyfferth

Limmer

2019

Soil Systems

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“…From recent past, Si has been accepted to trigger growth-promoting effects in plants at optimal concentration and can modulate tolerance to stresses to appreciable level 17 . The Si-rich amendments rice husk and rice can be used to reduce toxicity of arsenic (As) 18 . The Siapplication may increase salt tolerance in variuos important crops such as tomato, sorghum, and rice 19,[20][21][22] .…”

Section: Mechanism Of Silicon Against Abiotic Stressmentioning

confidence: 99%

POLYMERIZED SILICON (SiO2·nH2O) IN EQUISETUM ARVENSE: POTENTIAL NANOPARTICLE IN CROPS

García-Gaytán

Bojórquez-Quintal

Hernández-Mendoza

et al. 2019

J. Chil. Chem. Soc.

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All technological innovation that influences research to achieve yields and counteract biotic and abiotic stress in crops should be a priority for governments and scientists around the world. Silicon nanoparticles (NpSi) in the production and protection of crops are used as a sustainable strategy. In addition to NpSi, other nanoparticles have been applicable in areas such as environmental remediation, medicine and smart sensors. There are plants that accumulate high concentrations of Si in their tissues, such as "horsetail" (Equisetum arvense). A recent analysis of the elemental composition of E. arvense in a cross section, epidermis, and total biomass indicated that the Si concentration was higher in comparison with macro and micronutrients. Elemental mapping showed that all polymerized silicon (SiO2 • nH2O) is available in the epidermis of Equisetum. Currently, our team is investigating the extraction, purification and quantification of SiNp. The lines of emerging research should be those related to the interaction of SiNp in the cell wall, concentration and intelligent application with aerial equipment in crops such as vegetables, cereals, and fruits.

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Silicon Nutrition and Arbuscular Mycorrhizal Fungi

Garg

Bhandari²,

Kashyap

et al. 2020

Metalloids in Plants

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Silicon-rich amendments in rice paddies: Effects on arsenic uptake and biogeochemistry

Cited by 97 publications

References 46 publications

Si and Water Management Drives Changes in Fe and Mn Pools that Affect As Cycling and Uptake in Rice

Si and Water Management Drives Changes in Fe and Mn Pools that Affect As Cycling and Uptake in Rice

POLYMERIZED SILICON (SiO2·nH2O) IN EQUISETUM ARVENSE: POTENTIAL NANOPARTICLE IN CROPS

Silicon Nutrition and Arbuscular Mycorrhizal Fungi

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