Impacto do manejo da água na toxidez por ferro no arroz irrigado por alagamento

Schmidt, Fábiana; Fortes, Magali de Ávila; Wesz, Jonas; Buss, G. L.; Sousa, Rogério Oliveira de

doi:10.1590/s0100-06832013000500012

Cited by 15 publications

(12 citation statements)

References 24 publications

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“…The increase in pH is attributed to the Fe compounds in the soil that are reduced in the absence of O 2 with the release of OHions in the soil (Ponnamperuma, 1972). In addition, when acidic soils are flooded, anaerobic microorganism activity during the reduction of oxidized Fe compounds consumes H + ions, reducing the acidity of the soil (Schmidt et al, 2013;Ponnamperuma, 1972). The H + ions are used as electron acceptors for the respiration of anaerobic microorganisms.…”

Section: Resultsmentioning

confidence: 99%

“…In these soils, anaerobic bacteria decompose organic matter using oxidized compounds from the soil as electron acceptors, promoting a series of oxidation-reduction reactions. As a consequence, there is a decrease in the redox potential (Eh) and nitrogen (N), sulfur (S), copper (Cu) and zinc (Zn) contents as well as an increase in pH and phosphorus (P), iron (Fe) and manganese (Mn) availability (Gonçalves & Meurer, 2010;Schmidt et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The increase in pH resulting from waterlogging affects the mobilization dynamics of several elements. Fe +3 and Mn +4 in the soil surface are reduced to the forms Fe +2 and Mn +2 , respectively, increasing their solubility in the soil (Schmidt et al, 2013;Pezeshki & Delaune, 2012). P becomes more available mainly because of the reduction of ferric compounds to ferrous forms, and the release of P that was retained by adsorption or by specific chemical bonds (Gonçalves & Meurer, 2010;Ponnamperuma, 1972).…”

Section: Introductionmentioning

confidence: 99%

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Eletrochemical changes in Gleysol of the Amazon estuary

Silva

et al. 2015

Rev. Ciênc. Agrár.

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Electrochemical reactions are intensified by soil flooding, which changes the dynamics of nutrients and negatively affects plant growth. In this work, we aimed to evaluate the changes in the redox potential (Eh), pH and nutrient availability in a Haplic Gleysol soil from a floodplain of the Guamá River, Belém, Pará State. During the period of floods (61 days), samples soils were collected on alternate days and analyzed in dry and wet conditions. Flooding resulted in higher pH values and decreased Eh, which stabilized after 32 days of flooding and did not affect the values of total nitrogen. An increase in the concentrations of phosphorus, sulfur, iron, manganese, copper and zinc were observed, and they were subsequently reduced with time of submergence. The reduction of sulfur occurred at low Eh and pH values near neutrality. The results show that nitrogen and sulfur do not limit agricultural production in the lowland soils of the Guamá River. RESUMO: Reações eletroquímicas são intensificadas com a inundação do solo, o que altera a dinâmica dos nutrientes e afetando negativamente o crescimento das plantas. O objetivo foi de avaliar as alterações no potencial redox (Eh), pH e na disponibilidade de nutrientes de um Gleissolo Háplico em várzea do rio Guamá, Belém, estado do Pará, em função do tempo de inundação. O experimento foi conduzido em delineamento inteiramente casualizado, com quatro repetições, em condição de laboratório. Durante a inundação (61 dias) foram coletadas amostras de solos em dias alternados e analisadas secas e úmidas. A inundação proporcionou elevação dos valores de pH e diminuição no Eh, que estabilizaram-se após 32 dias, e não influenciou o teor de nitrogênio (N) total. Ocorreu aumento nos teores de fósforo (P), enxofre (S), ferro (Fe), manganês (Mn) e zinco (Zn), que foram posteriormente reduzidos com o tempo de inundação. A redução do S ocorreu em valores baixos de Eh e pH próximo da neutralidade. Os altos teores de N e o S demonstram que esses nutrientes não se configuram como limitantes da produção agrícola em solo de várzea do rio Guamá.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Eletrochemical changes in Gleysol of the Amazon estuary

Silva

et al. 2015

Rev. Ciênc. Agrár.

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“…The mean value of Fe in the whole plant, 9.714 g ha -1 (Table 3), was higher than the 4,640 g ha -1 reported by Faria (2014), or the 5,650 g ha -1 of Duarte et al (2003). This increase in plant tissue Fe may have occurred due to the higher availability of this elemento in sampled plot soils, which is most likely due to the source material and the intensive preparation of the soil (SCHMID et al, 2009, SCHMIDT et al, 2013.…”

Section: Resultsmentioning

confidence: 65%

“…O valor médio acumulado de Fe na planta inteira, 9.714 g ha -1 (Tabela 3), foi maior que o encontrado por Faria (2014), de 4.640 g ha -1 , e por Duarte et al (2003), de 5.650 g ha -1 . Esse maior acúmulo de Fe no tecido vegetal pode ter ocorrido devido à maior disponibilidade nos solos dos talhões amostrados, o que é explicado pelo material de origem e pelo preparo intensivo do solo (SCHMID et al, 2009, SCHMIDT et al, 2013.…”

Section: Resultsunclassified

Uptake and exportation of micronutrients in high productivity corn fields

Oliveira

Fonseca

Andrade

et al. 2019

AGRO@MBIENTE ON-LINE

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High yield corn has an increased demand for micronutrients, which requires updating knowledge of the nutritional demand patterns of the crop, especially under high production conditions. The objective of the currentstudy was therefore to determine the absorption and export patterns of copper (Cu), manganese (Mn), zinc (Zn) and iron (Fe) for high yield corn crops. Fifteen corn fields with high productive potential were sampled in the Alto Paranaíba, region, Minas Gerais, in the agricultural year 2014-2015. The following variables were evaluated: productivity, plant population, rows of grain per ear, grain per row, grain per ear, mass of one thousand grains, vegetation dry mass, dry mass of grains and total dry mass of the plant, besides the accumulation of micronutrients in the vegetative part and grains, and total micronutrient accumulation per whole plant. The grain and Cu, Mn, Zn and Fe harvest indices were also calculated. The data were submitted to descriptive statistics, Pearson coefficient linear correlation was calculated at the to 5% level and submitted to regression analysis. Cu and Zn absorption and export increase linearly with increased productivity. Micronutrient accumulation in high productivity maize is, in decreasing order, in the vegetative part: Fe> Mn> Zn> Cu; while in the grains and in the whole plant: Fe> Zn> Mn> Cu. Zn is the micronutrient with the highest harvest index.

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Tolerance mechanisms and irrigation management to reduce iron stress in irrigated rice

Carmona¹,

Adamski

Wairich

et al. 2021

Plant Soil

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Iron toxicity is a major nutritional disorder in rice plants, especially in ooded areas. The use of alternative crop management practices, such as soil drainage, may mitigate negative impacts of iron toxicity, since soil aeration that follows drainage can oxidize and precipitate potentially toxic Fe +2 into Fe 3+ . This study aimed to evaluate the impact of alternative water management on agronomical and physiological parameters in rice plants grown in a eld location with iron toxicity history. Rice cultivars BR-IRGA 409 (sensitive) and IRGA 425 (resistant to iron toxicity) were tested. Irrigation management comprised three treatments: Continuous Irrigation (CI), one cycle of water Suppression (1S) and two cycles of water Suppression (2S). Evaluations included the ionic composition of soil solution and leaf tissues, grain yield, antioxidant responses and gene expression. Permanent soil ooding resulted in higher grain yield in plants from the resistant than from the sensitive genotype, which had higher malondialdehyde (MDA) concentrations in leaves. In contrast, two cycles of alternate soil drying resulted in equivalent grain yield and MDA concentrations in both genotypes. Resistance to iron toxicity in IRGA 425 plants seems related to limited Fe translocation to shoots, increased tolerance to oxidative stress in leaves and higher expression of Ferritin, OsGAP1, OsWRKY80 and Oryzain-α genes. Plants from the BR-IRGA 409 cultivar (sensitive to Fe toxicity) improved growth and yield under the interrupted irrigation treatments, probably due to lower Fe availability in the soil solution. Management of water irrigation successfully alleviated Fe toxicity in rice plants cultivated in eld conditions.

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Impacto do manejo da água na toxidez por ferro no arroz irrigado por alagamento

Cited by 15 publications

References 24 publications

Eletrochemical changes in Gleysol of the Amazon estuary

Eletrochemical changes in Gleysol of the Amazon estuary

Uptake and exportation of micronutrients in high productivity corn fields

Tolerance mechanisms and irrigation management to reduce iron stress in irrigated rice

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