Determination of reactivity rates of silicate particle-size fractions

Deus, Angélica Cristina Fernandes; Büll, Leonardo Theodoro; Corrêa, Juliano Corulli; Bôas, Roberto Lyra Villas

doi:10.1590/s0034-737x2014000200015

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…However, for magnesium the intermediate sieves were responsible for the highest values of this element in the soil. Therefore, Deus et al (2014) indicated that the smaller the particle size of the corrective materials, high was the availability of calcium due to increased contact of the material with the soil, resulting in higher specific surface area and thus greater solubility. Regarding the controls, the treatment receiving slag presented higher magnesium availability in soil and both were similarly able to provide calcium to the soil.…”

Section: Resultsmentioning

confidence: 99%

Reactivity of a blast furnace slag in latosols

Soares¹,

Prado²,

Furlaneto³

2015

Afr. J. Agric. Res.

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Two experiments were conducted to study reactivity for a blast furnace slag, both developed in a greenhouse, in pots planted with Brachiaria brizantha. A 3 x 4 + 3 factorial was used with four replications, with three slag doses corresponding to 0.6, 1.2 and 2.4 g dm -3 for the clay soil and 2.2, 4.4 and 8.8 g dm -3 for the medium texture soil, four particle sizes (ABNT 5-10, 10-20, 20-50 and <50) and three controls (without corrective application, slag and dolomitic limestone in a dose corresponding to V=70%). In the clayey soil, there was a low efficiency of Ca and Mg release to the soil with the use of slag. It was concluded the slag, in its different particle size fractions influenced differently the pH, Ca and Mg of medium texture soil, where the fraction that passed through the ABNT 50 sieve had a greater effect on the chemical attributes evaluated. The corrective agents, slag and limestone, acted similarly on pH, Ca, Mg and V%. For greater liberation of silicon to the soil and absorption by plants it is necessary to use smaller particle sizes in the medium texture soil and intermediate particle sizes in the soil with clayey texture.

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Section: Resultsmentioning

confidence: 99%

Reactivity of a blast furnace slag in latosols

Soares¹,

Prado²,

Furlaneto³

2015

Afr. J. Agric. Res.

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“…The RER value was used to calculate the reactivity rate (RR) for each corrective source (Deus et al, 2014). Afterwards, the ECC was calculated, hereby denominated Experimental ECC, by the following equation:…”

Section: Methodsmentioning

confidence: 99%

Nutrient accumulation and biomass production of alfafa after soil amendment with silicates

et al. 2014

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RESUMO Acúmulo de nutrientes e produção de biomassa de plantas de alfafa após correção do solo com silicatosPesquisas sobre o uso agronômico de corretivos à base de silicatos têm apontado o grande potencial desses insumos, no sentido de promover melhorias químicas do solo. Há poucas informações, porém, sobre as taxas de reatividade de suas frações granulométricas. O objetivo deste estudo foi verificar se a eficiência relativa de reatividade das frações granulométricas, obtidas experimentalmente, poderiam ser consideradas no cálculo do PRNT para prática da calagem, proporcionando adequado desenvolvimento de plantas de alfafa. Utilizaram-se seis tratamentos, que consistiram em duas escórias, aplicadas em duas doses, uma utilizando-se do PRNT medido experimentalmente e, a outra, do PRNT determinado em laboratório; calcário dolomítico e wollastonita, aplicados em uma dose, utilizando-se o PRNT determinado em laboratório. As doses dos corretivos foram calculadas a fim de elevar a saturação por bases a 80 %, considerando o PRNT experimental e de laboratório. Os tratamentos foram aplicados a dois solos: Latossolo Vermelho distrófico e Nitossolo Vermelho eutrófico. Os métodos de determinação de PRNT preconizados para calcários podem ser aplicados para escórias de siderurgia. A aplicação das escórias proporcionou ação corretiva do solo, com consequente maior acúmulo de Ca, P, e Si nas plantas de alfafa, favorecendo sua produção de matéria seca.Palavras-chave: escória de aciaria, acidez, PRNT, Medicago sativa L.. Received: 04/03/2013; Approved:11/02/2014 Studies on the use of silicate correctives in agriculture show that they have great potential to improve soil chemical characteristics, however, little information is available on the reactivity rates of their particle-size fractions. This study investigated whether the reactivity rates obtained experimentally could be considered in the calculation of ECC (effective calcium carbonate) for soil liming, promoting adequate development of alfalfa plants. Six treatments were evaluated in the experiment, consisting of two slag types applied in two rates. The experimental ECC was used to calculate one of the rates and the ECC determined in the laboratory was used to calculate the other. Rates of limestone and wollastonite were based on the ECC determined in laboratory. The rates of each soil acidity corretive were calculated to increase the base saturation to 80%. The treatments were applied to a Rhodic Hapludox and an Alfisol Ferrudalfs. The methods for ECC determination established for lime can be applied to steel slag. The application of slag corrected soil acidity with consequent accumulation of Ca, P, and Si in alfalfa, favoring DM production.

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