Residual Effects of Calcium Silicate in Tropical Soils: I. Fate of Applied Silicon During Five Years Cropping

Khalid, R. A.; Silva, J. A.; Fox, R. L.

doi:10.2136/sssaj1978.03615995004200010020x

Cited by 32 publications

(22 citation statements)

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“…A concentração de silício foi maior com a fonte silicato de sódio (Tabela 1), devido a maior solubilidade do produto, comparado ao silicato de cálcio, favorecendo maior absorção do elemento. Com relação às doses, o teor de silício no caule reduziu até a dose de 0,53 g.kg (Khalid et al, 1978). Fontes de silicato de cálcio provenientes de siderurgia, 'Wollastonita', silicato de magnésio e termofosfato foram avaliadas por Korndörfer & Gascho, 1999, em quatro tipos de solo.…”

Section: Resultsunclassified

Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Botelho

Pozza

et al. 2005

Fitopatol. bras.

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Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício. Fitopatologia Brasileira 30: 582-588. 2005. RESUMOO objetivo deste estudo foi avaliar o efeito dos silicatos de cálcio e de sódio sobre a intensidade da cercosporiose (Cercospora coffeicola) em mudas de cafeeiro (Coffea arabica), cultivar Catuaí IAC 99, nas doses 0; 0,32; 0,64; 1,26 g de SiO 2 .kg -1 de substrato. Foram realizadas cinco avaliações quinzenais nas quais se quantificou o número de plantas doentes, o número de folhas lesionadas por planta, o número de lesões por folha e o número total de lesões por planta. Essas avaliações foram utilizadas para construir a área abaixo da curva de progresso da doença. Ao término das avaliações, foram determinados os teores de macro, micronutrientes, silício e lignina na parte aérea das mudas de cafeeiro. A menor área abaixo da curva de progresso do total de lesões foi obtida com a dose de 0,84 g.kg -1 de silicato de sódio. Observouse decréscimo linear para área abaixo da curva de progresso do número de plantas doentes e aumento na concentração de lignina nas folhas até a dose de 0,52 g.kg -1 de silicato de sódio, enquanto no caule houve acúmulo de SiO 2 até 0,53 g.kg Palavras-chave adicionais:Coffea arabica, Cercospora coffeicola, silicato de sódio, silicato de cálcio. ABSTRACT Effect of silicon doses and sources on the intensity of the brown eye spot of coffee seedlingsThe objective of this work was to evaluate the effect of calcium and sodium silicate on the intensity of brown eye spot (Cercospora coffeicola) in coffee (Coffea arabica) seedlings (Catuaí IAC 99) by using doses (0; 0.32; 0.63 and 1.26 g of SiO 2 .kg -1 ) of substrate. Five evaluations were done by counting the number of diseased plants, number of leaves with lesions, number of lesions per leaf and total number of lesions per plant. The concentration of macro, micronutrients, silicon and lignin in the leaves was determined at the end of the experiment. The lowest area under the disease progress curve of the total number of lesions was observed with 0.84 g.kg -1 of sodium silicate. Diseased plants were found to have a linear decrease of area under the disease progress curve and an increase in the concentration of lignin up to the dose of 0.52 g.kg -1 of sodium silicate. The increase of sodium silicate and dose application into the soil up to 0.53 g.kg -1 decreased the concentration of SiO 2 on the stem.Additional keywords: Coffea arabica, Cercospora coffeicola, sodium silicate, calcium silicate.

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Section: Resultsunclassified

Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Botelho

Pozza

et al. 2005

Fitopatol. bras.

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“…The phosphate extractant with 3.5 pH adjusted with acetic acid (HAOc) may have some advantages because it seems to extract adsorbed Si (capacity factor) as well as water-soluble Si (intensity factor) from soil. (Fox et al, 1967a;Khalid et al, 1978). Korndörfer et al (1999b) working with upland rice and four different soils concluded that among the extractants tested, the acetic acid 0.5 M gave the best estimate for the available Si in the soil.…”

Section: Soil Testingmentioning

confidence: 99%

Silicon nutrition and sugarcane production: A review¹

Savant¹,

Korndörfer

Datnoff

et al. 1999

Journal of Plant Nutrition

332

219

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Silicon (Si) is one of the most abundant elements found in the earth's crust, but is mostly inert and only slightly soluble. Agriculture activity tends to remove large q uantities of Si from soil. Sugarcane is known to absorb more Si than any other mineral nutrient, accumulating approximately 380 kg ha -1 of Si, in a 12-month old crop. Sugarcane (plant growth and development) responses to silicon fertilization have been documented in some areas of the world, and applications on commercial fields are routine in certain areas. The reason for this plant response or yield increase is not fully understood, but several mechanisms have been proposed. Some studies indicate that sugarcane yield responses to silicon may be associated with induced resistance to biotic and abiotic stresses, such as disease and pest resistance, Al, Mn and Fe toxicity alleviation, increased P availability, reduced lodging, improved leaf and stalk erectness, freeze resistance, and improvement in plant water economy. This review covers the relationship of silicon to sugarcane crop production, including recommendations on how to best manage silicon in soils and plants, silicon interactions with others elements, and laboratory methodology for determining silicon in the soil, plant and fertilizer. In addition, a future research agenda for silicon in sugarcane is proposed.

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“…Their dissolution is triggered by acidity production, and the risk of pH overshooting is prevented (31). Wollastonite (CaSiO 3 ) powder, a fast-dissolving calcium silicate, is commonly used in agronomy as a liming agent (32,33), but the utilization of silicates for remediation of contaminated water bodies and groundwater has rarely been investigated. The addition of wollastonite to an anthropogenically acidified stream was found to be highly effective in increasing the pH and the acid-neutralizing capacity of stream water (34,35).…”

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Use of Silicate Minerals for pH Control during Reductive Dechlorination of Chloroethenes in Batch Cultures of Different Microbial Consortia

Lacroix

Brovelli

Barry

et al. 2014

Appl Environ Microbiol

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In chloroethene-contaminated sites undergoing in situ bioremediation, groundwater acidification is a frequent problem in the source zone, and buffering strategies have to be implemented to maintain the pH in the neutral range. An alternative to conventional soluble buffers is silicate mineral particles as a long-term source of alkalinity. In previous studies, the buffering potentials of these minerals have been evaluated based on abiotic dissolution tests and geochemical modeling. In the present study, the buffering potentials of four silicate minerals (andradite, diopside, fayalite, and forsterite) were tested in batch cultures amended with tetrachloroethene (PCE) and inoculated with different organohalide-respiring consortia. Another objective of this study was to determine the influence of pH on the different steps of PCE dechlorination. The consortia showed significant differences in sensitivities toward acidic pH for the different dechlorination steps. Molecular analysis indicated that Dehalococcoides spp. that were present in all consortia were the most pH-sensitive organohalide-respiring guild members compared to Sulfurospirillum spp. and Dehalobacter spp. In batch cultures with silicate mineral particles as pH-buffering agents, all four minerals tested were able to maintain the pH in the appropriate range for reductive dechlorination of chloroethenes. However, complete dechlorination to ethene was observed only with forsterite, diopside, and fayalite. Dissolution of andradite increased the redox potential and did not allow dechlorination. With forsterite, diopside, and fayalite, dechlorination to ethene was observed but at much lower rates for the last two dechlorination steps than with the positive control. This indicated an inhibition effect of silicate minerals and/or their dissolution products on reductive dechlorination of cis-dichloroethene and vinyl chloride. Hence, despite the proven pH-buffering potential of silicate minerals, compatibility with the bacterial community involved in in situ bioremediation has to be carefully evaluated prior to their use for pH control at a specific site.

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Residual Effects of Calcium Silicate in Tropical Soils: I. Fate of Applied Silicon During Five Years Cropping

Cited by 32 publications

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Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Silicon nutrition and sugarcane production: A review¹

Use of Silicate Minerals for pH Control during Reductive Dechlorination of Chloroethenes in Batch Cultures of Different Microbial Consortia

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Residual Effects of Calcium Silicate in Tropical Soils: I. Fate of Applied Silicon During Five Years Cropping

Cited by 32 publications

References 0 publications

Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Intensidade da cercosporiose em mudas de cafeeiro em função de fontes e doses de silício

Silicon nutrition and sugarcane production: A review1

Use of Silicate Minerals for pH Control during Reductive Dechlorination of Chloroethenes in Batch Cultures of Different Microbial Consortia

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Silicon nutrition and sugarcane production: A review¹