Importância das espécies minerais no potássio total da fração argila de solos do Triângulo Mineiro

Melo, Vander Freitas; Corrêa, Guilherme Resende; Maschio, Paulo Alessandro; Ribeiro, Anderson Nora; Lima, Valmiqui Costa

doi:10.1590/s0100-06832003000500005

Cited by 22 publications

(36 citation statements)

References 18 publications

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“…Basal reflections of micaceous minerals (illite and interstratified illite / kaolinite) after sequential treatments for removal of Fe and Al oxides and kaolinite were observed for Oxisols from various regions of Brazil by DRX (Melo et al, 2003). In the present study, the ratio between Mg extracted by the 3051A method / exchangeable Mg was 873 for OX.…”

Section: Acid Extractions Of K and Mgsupporting

confidence: 46%

Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Batista

Melo

Gilkes

2016

Rev. Bras. Ciênc. Solo

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Extraction of K and Mg with boiling 1 mol L -1 HNO 3 in an open system for predicting K and Mg uptake by plants is a method of low reproducibility. The aim of this study was to compare the extraction capacity of different acid methods relative to hydrofluoric acid extraction for K and Mg. A further objective was to develop a chemical extraction method using a closed system (microwave) for nonexchangeable and structural forms of these nutrients in order to replace the traditional method of extraction with boiling HNO 3 on a hot plate (open system). The EPA 3051A method can be used to estimate the total content of K in the clay fraction of soils developed from carbonate and phyllite/mica schist rocks. In the clay fraction of soils developed from basalt, recoveries of K by the EPA 3051A (pseudo-total) method were higher than for the EPA 3052 (total hydrofluoric extraction) method. The relative abundance of K and Mg for soils in carbonate rocks, phyllite/mica schist, granite/gneiss, and basalt determined by aqua regia digestion is unreliable. The method using 1 mol L -1 HNO 3 in an closed system (microwave) showed potential for replacing the classical method of extraction of nonexchangeable forms of K (boiling 1 mol L -1 HNO 3 in an open system -hot plate) and reduced the loss of Si by volatilization.

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Section: Acid Extractions Of K and Mgsupporting

confidence: 46%

Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Batista

Melo

Gilkes

2016

Rev. Bras. Ciênc. Solo

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“…A presença do arenito Botucatu intertrapeado no basalto (RADAMBRASIL, 1983) de origem do NVdf de Ituiutaba resultou nos baixos teores totais de K e Mg das amostras 11 e 12. Já os solos mais jovens desenvolvidos de arenito e granito apresentaram, de maneira geral, teores mais expressivos de K e Mg na fração argila (amostras 3, 6, 7, 13 e 14) (teor máximo de K e Mg igual a 10.204 e 17.840 mg kg -1 , respectivamente), graças, principalmente, à maior presença de minerais primários fontes destes nutrientes (Melo et al, 2003). Estes autores verificaram que a fração argila dos solos foi essencialmente caulinítica.…”

Section: Resultados E Discussão Formas De K E Mg Na Fração Argila Dosunclassified

“…Com a ação intensa do intemperismo, a biotita tende a aumentar seu espaço interplanar na direção (001), liberando, num primeiro momento, maior quantidade de K, aumentando, ainda mais, a diferença entre os teores de K e Mg no mineral (Quadros 2 e 3). Já os maiores teores totais de K verificados no PVAe (amostras 13 e 14) podem ser atribuídos à presença de feldspato potássico na fração argila dos horizontes Bt e BC (Melo et al, 2003). Dado o menor poder de extração deste mineral pelo HNO 3 1 mol L -1 , verificou-se maior liberação de Mg (ataque preferencial de biotita) nas amostras 13 e 14 (Quadros 2 e 3).…”

Section: Resultados E Discussão Formas De K E Mg Na Fração Argila Dosunclassified

“…Os difratogramas foram obtidos em goniômetro vertical Philips, modelo PW1050/70, com velocidade de 1 ° 2 θ/min e amplitude de 2 a 40 ° 2 θ. O difratômetro, equipado com filtro de Ni e utilizando radiação CuKα, foi operado a 40 kV e 20 mA. A mineralogia da fração argila sem tratamento foi descrita por Melo et al (2003).…”

Section: Difratometria De Raios-x (Drx)unclassified

“…As amostras de fração argila dos horizontes Bt e BC do solo originado do Grupo Araxá (amostras 13 e 14) apresentaram relativamente altos teores de mica (84,5 e 88,8 g kg -1 , respectivamente) e de feldspato potássico (19,2 a 49,3 g kg -1 ) (Melo et al, 2003), justificando os altos teores totais de K e Mg e maiores teores acumulados (1.382 h) de K e Mg no estudo de cinética (Quadros 2 e 3).…”

Section: Cinética De Liberação De K E Mg Da Fração Argilaunclassified

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Cinética de liberação de potássio e magnésio pelos minerais da fração argila de solos do Triângulo Mineiro

Melo

Corrêa

Ribeiro

et al. 2005

Rev. Bras. Ciênc. Solo

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Application of an improved vegetation index based on the visible spectrum in the diagnosis of degraded pastures: Implications for development

et al. 2021

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Inadequate pasture management causes land degradation through reduction of grass, increased presence of invasive plants or pests, compaction, erosion, and nutrient deficiency. The recognition of pasture degradation is therefore essential. Remote sensing satellite systems allow us to do so at regional‐to global scales. A struggle is in progress nowadays is to improve detection accuracy and implement high‐resolution surveys at farm scales using low‐cost unmanned aerial vehicles (UAVs). The pasture imagery can be translated into maps of degraded pasture using the popular NDVI as diagnostic parameter, but their generation using a UAV requires a high‐cost NIR sensor, while the struggle is to use low‐cost UAVs equipped with RGB cameras. The first step to recognize degraded pastures using RGB cameras is to define a suitable vegetation index. Thus, the purpose of this study was to present the total brightness quotient of red (TBQR), green (TBQG), and blue (TBQB) bands. The test to the index resorted to LANDSAT‐8 satellite images captured over the environmental protection area of Uberaba River basin (Minas Gerais, Brazil) in the 2017–2019 period. The images were not captured by a UAV because the equipment was not then available. The results were promising given the large detection accuracy (88.63%) of the TBQG and the high (0.965) correlation between TBQG and NDVI. Besides, the TBQ‐based areas of degraded pasture (17,486.3–25,180.1 hectares) were larger than the NDVI counterparts (12,066.9 hectares). This is an additional reason to oversight degraded pastures based on the TBQs, as they seek for improved environmental compliance and economic development.

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Importância das espécies minerais no potássio total da fração argila de solos do Triângulo Mineiro

Cited by 22 publications

References 18 publications

Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Microwave Acid Extraction to Analyze K and Mg Reserves in the Clay Fraction of Soils

Cinética de liberação de potássio e magnésio pelos minerais da fração argila de solos do Triângulo Mineiro

Application of an improved vegetation index based on the visible spectrum in the diagnosis of degraded pastures: Implications for development

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