Rochas silicáticas portadoras de potássio como fontes do nutriente para as plantas solo

Ribeiro, Luciano da Silva; Santos, Anacleto Ranulfo dos; Souza, L. F. da S.; Souza, Jamile Santana

doi:10.1590/s0100-06832010000300030

Cited by 30 publications

(38 citation statements)

References 10 publications

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“…The harmful effect of salinity on nutrient uptake was related to a chemical competition of Ca, Mg and K with Na. The increase in exchangeable sodium associated with ultramafic rock has been related to increasing proportion of Na in CEC, reaching up to 16% at 300 kg K 2 O ha -1 rock equivalent (Resende et al, 2006;Ribeiro et al, 2010). The decreasing shoot and root dry mass production in the rock equivalent K 2 O doses in this experiment were as follows: mining byproduct > ultramafic > Chapada byproduct > biotite schist = breccia = phlogopite.…”

Section: Resultsmentioning

confidence: 59%

“…Crushed rocks can be considered multinutrient fertilizers carrying silicate minerals containing other macro and micronutrients in variable concentrations. Among these, the main are phosphorus, calcium and magnesium (Wilpert and Lukes, 2003;Ribeiro et al, 2010). In addition to the supply of macronutrients, some crushed rocks promote changes in soil characteristics such as acidity due to variable Relative Neutralization Value (RNV).…”

Section: Introductionmentioning

confidence: 99%

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Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Silva¹,

Spehar²,

Marchi³

et al. 2014

Afr. J. Agric. Res.

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The increasing world population has led into big food and raw material demand, with high pressure on agriculture. In Brazil, potassium fertilizers are mostly imported rising interest on rocks and mining rejects as alternative sources. The objective of this work was to evaluate the effect of crushed rocks over mineral nutrition, yield and efficiency of potash fertilization in rice. The experiment was carried out under greenhouse conditions in pots with 3.7 kg of Oxisol soil samples. The experimental design was completely randomized, in a factorial layout 4 × 6, comprising six crushed rocks used as alternative multinutrient fertilizer (breccia, biotite schist, ultramafic, Chapada byproduct, mining byproduct and phlogopite), and four doses based on potassium (0, 200, 400, 600 kg K 2 O ha -1 ), with four replications. The concentration and accumulation of potassium, copper, zinc and nickel in rice shoot dry mass were determined. These data were used to evaluate the efficiency index of K-source rocks on fertilization. It was shown that crushed rocks promote alterations in mineral nutrition, grain yield and potassium use efficiency, remarking their potential to be used as alternative fertilizer in rice cropping systems.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Silva¹,

Spehar²,

Marchi³

et al. 2014

Afr. J. Agric. Res.

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“…This is due to several factors; the pH, for instance, influences P availability, and in this soil type, characterized by variable charges, increases in pH raise the P availability. Ribeiro et al (2010) observed that ultramafic rocks also contributed to an increase in exchangeable K, as well as P, Na, pH and base saturation in a Latossolo Amarelo (Oxisol).…”

Section: Resultsmentioning

confidence: 94%

“…Ribeiro et al (2010) reported that alkaline ultramafic rock has proved promising for acidic soils, releasing K + , Ca 2+ , and Mg 2+ . This rock powder can also influence the uptake of other nutrients, such as Fe, Mn and Zn, promoting plant growth and development, and play a role as soil conditioner.…”

Section: Resultsmentioning

confidence: 99%

Effect of Alternative Multinutrient Sources on Soil Chemical Properties

Martins

Silva

Marchi

et al. 2015

Rev. Bras. Ciênc. Solo

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The current high price of potassium chloride and the dependence of Brazil on imported materials to supply the domestic demand call for studies evaluating the efficiency of alternative sources of nutrients. The aim of this work was to evaluate the effect of silicate rock powder and a manganese mining by-product, and secondary materials originated from these two materials, on soil chemical properties and on brachiaria production. This greenhouse experiment was conducted in pots with 5 kg of soil (Latossolo Vermelho-Amarelo distrófico -Oxisol). The alternative nutrient sources were: verdete, verdete treated with NH 4 OH, phonolite, ultramafic rock, mining waste and the proportion of 75 % of these K fertilizers and 25 % lime. Mixtures containing 25 % of lime were heated at 800 ºC for 1 h. These sources were applied at rates of 0, 150, 300, 450 and 600 kg ha -1 K 2 O, and incubated for 45 days. The mixtures of heated silicate rocks with lime promoted higher increases in soil pH in decreasing order: ultramafic rock>verdete>phonolite>mining waste. Applying the mining waste-lime mixture increased soil exchangeable K, and available P when ultramafic rock was incorporated. When ultramafic rock was applied, the release of Ca 2+ increased significantly. Mining subproduct released the highest amount of Zn 2+ and mn 2+ to the soil. The application of alternative sources of K, with variable chemical composition, altered the nutrient availability and soil chemical properties, improving mainly plant development and K plant uptake, and are important nutrient sources.

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“…Deste modo, o desenvolvimento de um novo insumo agrícola, derivado de uma rocha existente no território nacional, beneficiaria o setor agrícola e mineral [8,9]. Dentre estas rochas o verdete se destaca por apresentar uma porcentagem de K 2 O que varia entre 6 e 14%, sua coloração verde se deve a presença de íons Fe 2+ na estrutura da glauconita, que é seu principal constituinte [10].…”

Section: Introductionunclassified

Verdete de cedro do abaeté como fonte de potássio: caracterização, tratamento térmico e reação com CaO

et al. 2012

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O potássio é um dos principais macronutrientes presentes no solo. Entretanto, no Brasil este se torna escasso devido à elevada acidez dos solos tropicais. Dessa forma, a demanda por fontes alternativas de potássio cresce consideravelmente. Nesse contexto, foi realizada a caracterização química e mineralógica do verdete de Cedro do Abaeté, Minas Gerais, assim como, uma avaliação do tratamento térmico da mesma com ou sem a adição de CaO, visando a solubilização do potássio presente na rocha. A caracterização da rocha foi desenvolvida pelas técnicas de difração de raios X (DRX), fluorescência de raios X (FRX) e espectroscopia no infravermelho (IV). A avaliação dos resultados de FRX mostra que a rocha possui 6,95% em massa de K2O, referente à presença de glauconita. Esta foi confirmada por DRX, devido à presença de picos característicos em 1,00; 0,45; 0,24 e 0,15 nm, e por IV pela ocorrência de bandas em 3520, 3440, 1020 e 630 cm-1. Há também alto teor de SiO2 (64,65%), indicativo da presença de quartzo, que é caracterizado por um pico intenso em 0,335 nm. Na etapa de tratamento térmico, o verdete foi aquecido por 2 horas a uma temperatura de 1200ºC. Para aumentar a solubilidade do potássio, presente na rocha, foi realizado a reação com óxido de cálcio nas proporções de 10, 20 e 30%, em massa. As modificações estruturais na rocha foram acompanhadas por DRX e IV. Constatou-se reação entre a rocha e o óxido de cálcio, sendo observadas modificações na posição de bandas características do estiramento Si-O nos espectros de IV, em torno de 1100 cm-1 e o desaparecimento dos picos de difração de raios X referentes à glauconita. A reação com 20% de CaO permitiu uma extração de 7,7% do potássio presente na amostra.

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Rochas silicáticas portadoras de potássio como fontes do nutriente para as plantas solo

Cited by 30 publications

References 10 publications

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Yield, nutrient uptake and potassium use efficiency in rice fertilized with crushed rocks

Effect of Alternative Multinutrient Sources on Soil Chemical Properties

Verdete de cedro do abaeté como fonte de potássio: caracterização, tratamento térmico e reação com CaO

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