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| Registros recuperados: 156 | |
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| Silva,Sérgio Henrique Godinho; Silva,Elen Alvarenga; Poggere,Giovana Clarice; Guilherme,Luiz Roberto Guimarães; Curi,Nilton. |
| ABSTRACT Portable X-ray fluorescence spectrometer (pXRF) has been recently adopted by the Soil Science community for uses in both field and laboratory, obtaining the total content of several chemical elements in a few seconds. Sulfuric acid digestion is an expensive and time-consuming laboratory analysis that provides contents of Fe2O3, Al2O3, SiO2, TiO2 and P2O5, important for soil studies. Due to few pXRF studies in tropical soils, this work aimed to compare contents of Fe2O3, Al2O3, SiO2, TiO2 and P2O5 obtained by pXRF with sulfuric acid digestion results, and to evaluate the effects of varying forms of preparing soil samples and scanning with pXRF on the resulting values in Brazilian soils. Soils were scanned in five conditions in-field (in situ) and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil chemical properties; Proximal sensor; Sulfuric acid digestion analysis; Soil properties prediction; Oxides. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100080 |
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| Silva,Mayesse Aparecida da; Silva,Marx Leandro Naves; Curi,Nilton; Oliveira,Anna Hoffmann; Avanzi,Junior Cesar; Norton,Lloyd Darrell. |
| Eucalyptus plantations are normally found in vulnerable ecosystems such as steep slope, soil with low natural fertility and lands that were degraded by agriculture. The objective of this study was to obtain Universal Soil Loss Equation (USLE) factors and use them to estimate water erosion risk in regions with eucalyptus planted. The USLE factors were obtained in field plots under natural rainfall in the Rio Doce Basin, MG, Brazil, and the model applied to assess erosion risk using USLE in a Geographic Information System. The study area showed rainfall-runoff erosivity values from 10,721 to 10,642 MJ mm ha-1 h-1 yr-1. Some soils (Latosols) had very low erodibility values (2.0 x 10-4 and 1.0 x 10-4t h MJ-1 mm-1), the topographic factor ranged from 0.03 to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: USLE factors; Soil loss tolerance; Conservation practices; Forest management. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000200007 |
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| Maluf,Henrique José Guimarães Moreira; Silva,Carlos Alberto; Curi,Nilton; Norton,Lloyd Darrell; Rosa,Sara Dantas. |
| ABSTRACT Humic acid (HA) may reduce adsorption and increase soil P availability, however, the magnitude of this effect is different when Ca2+ prevails over Mg2+ in limed soils. The objective of this study was to evaluate the effects of HA rates and carbonate sources on the adsorption, phosphate maximum buffering capacity (PMBC), and P availability in two contrasting soils. Oxisol and Entisol samples were firstly incubated with the following HA rates: 0, 20, 50, 100, 200 and 400 mg kg-1, combined with CaCO3 or MgCO3, to evaluate P adsorption. In sequence, soil samples were newly incubated with P (400 mg kg-1) to evaluate P availability. The least P adsorption was found when 296 mg kg-1 of HA was added to Oxisol. Applying HA rates decreased maximum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic ligands; Liming; Humic acid-metal-P complexes; Langmuir isotherm; Phosphate maximum buffering capacity.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100007 |
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| Mello,Carlos Rogério de; Curi,Nilton. |
| Pedology consists of a sub-area of Soil Science that studies the soil and its origin as well as its inter-relationship with the landscape. Hydrology is the science that studies the water in nature in its different mediums (atmosphere, soil and rock), using the watershed as a reference for analysis of the water dynamics and also its interaction with the landscape. The relationship between these two branches of knowledge has been the object of debate and analysis in recent years, contributing to the creation of a multidisciplinary science, which seeks to integrate the respective fields of research. As such, for Hydrology, Pedology has been fundamental for enabling a foundation for the processes associated to the generation of runoff and groundwater recharge,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrology; Pedology; Soil hydrology; Geomorfology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000200001 |
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| Oliveira,Jeani Moreira de; Silva,Sérgio Henrique Godinho; Menezes,Michele Duarte de; Kämpf,Nestor; Curi,Nilton. |
| ABSTRACT Environmental pollution is a problem that has been noted due to changes in the environment, affecting natural resources. Regarding the soil, it may offer great potential for waste disposal. Thus, this study aims to propose criteria for evaluating local suitability for waste disposal, according to soil and terrain attributes for southern Minas Gerais State, and to apply those criteria to define the most appropriate locations for installation of septic systems in a pilot watershed. Literature and the authors' experience were used to propose the more important criteria regarding the suitability of sites for waste disposal. The set of attributes taken into account was grouped into four suitability classes: Adequate, Regular, Restricted and Inadequate.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental pollution; Watershed; Pedology.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000100037 |
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| Mello,Carlos Rogério de; Norton,Lloyd Darrell; Curi,Nilton; Yanagi,Silvia Nazaré Monteiro. |
| Relationships between regional climates and oceanic and atmospheric anomalies are important in understanding the rainfall regime of a given region. This work aimed to analyze rainfall erosivity in the Upper Grande River Basin, Southern Minas Gerais State, Brazil; namely the two most representative environments, the Mantiqueira Range (MR) and the Plateau of Campos das Vertentes (PCV). These areas can be affected by the El Niño Southern Oscillation (ENSO) phenomena, which can be evaluated by indicators such as Sea Surface Temperature (SST) for the Niño 3.4 Region. Rainfall erosivity was calculated for individual rainfall events from January, 2006 to December, 2010. Pearson's coefficient of correlation was used to evaluate the relationships between rainfall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil erosion; El-Niño; La-Niña; Grande River basin. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000100007 |
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| Pelegrino,Marcelo Henrique Procópio; Silva,Sérgio Henrique Godinho; Menezes,Michele Duarte de; Silva,Elidiane da; Owens,Phillip Ray; Curi,Nilton. |
| ABSTRACT Existing soil maps (legacy data) associated with digital mapping techniques are alternatives to obtain information at lower costs, however, tests are required to do it more efficiently. This study had as objectives to compare different methods to extract information from detailed scale soil maps using decision trees for mapping soil classes at two watersheds in Minas Gerais, validate these maps in the field and use the best method to extrapolate information to larger areas, also validating these maps of larger areas. Detailed soil maps of Vista Bela creek (VBW) and Marcela creek (MCW) watersheds were used as source of information. Seven methods to extract information from maps were compared: the whole polygon, eliminating 20 and 40 m from the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Decision trees; Pedology; Tropical soils. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000500534 |
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| Pinto,Leandro Campos; Zinn,Yuri Lopes; Mello,Carlos Rogério de; Owens,Phillip Ray; Norton,Lloyd Darrell; Curi,Nilton. |
| ABSTRACTUnderstanding soil formation processes across different landscapes is needed to predict how soil properties will respond to land use change. This study aimed to characterize mountainous Inceptisols (Cambisols) under high altitude subtropical climate in southeastern Brazil, by soil physical, chemical and micromorphological analyses, under native forest and pasture. The soil under pasture had a greater bulk density than under forest, resulting in a severe reduction of macroporosity. At two depths, coarse quartz grains are angular, suggesting absence of transportational processes, thus confirming an autochthonous pedogenesis from the underlying gneissic rock. Most feldspars were weathered beyond recognition, but mineral alteration was commonly seen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil formation; Soil microstructure; Land use change; Forest soils. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500455 |
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| Costa,Adriana Monteiro da; Curi,Nilton; Menezes,Michele Duarte de; Araújo,Elias Frank de; Marques,João José. |
| A utilização adequada de informações contidas em levantamentos de solos fornece subsídios para o planejamento de diversas áreas de atividade, sejam agrícolas ou não-agrícolas. Entretanto, tem-se observado a ampliação dos mapas de solos de microbacias hidrográficas e de municípios, a partir de mapas de pequena escala, sem trabalhos de campo. Essa prática, no entanto, não é aconselhável, podendo levar à interpretações incorretas. Assim, este trabalho foi desenvolvido com o objetivo de executar o levantamento detalhado de solos de uma microbacia hidrográfica localizada no estado do Rio Grande do Sul e comparar as informações obtidas pelo levantamento detalhado de solos, escala 1:10.000, com aquelas dos mapas ampliados do levantamento de reconhecimento de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mapas; Ampliação de mapas; Tipos de mapas de solos. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000500011 |
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| Resende,Álvaro Vilela de; Furtini Neto,Antonio Eduardo; Alves,Vera Maria Carvalho; Muniz,Joel Augusto; Curi,Nilton; Lago,Fabiano José do. |
| Objetivou-se comparar fertilizantes fosfatados em diferentes modos de aplicação, durante três cultivos sucessivos de milho, num Argissolo Vermelho já adubado anteriormente. Foi utilizado um fatorial 4 x 2+1, envolvendo quatro fontes de P (superfosfato triplo ST, termofosfato magnesiano TM, fosfato reativo de Arad FR e fosfato natural de Araxá FA), duas formas de aplicação (a lanço ou no sulco de plantio), e uma testemunha (sem P) como tratamento adicional. Foram fornecidos 180 kg ha-1 de P2O5 no primeiro cultivo, com base nos teores totais das fontes. Para os cultivos seguintes, não foi feito preparo do solo. Determinaram-se os teores de nutrientes no solo e nas folhas de milho e a produção de grãos. As respostas aos tratamentos foram mais discrepantes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilidade do solo; Fosfato reativo; Fosfato natural; Adubação fosfatada; Zea mays. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542006000300011 |
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| Araújo,Alexandre Romeiro de; Carvalho,João Luís Nunes; Guilherme,Luiz Roberto Guimarães; Curi,Nilton; Marques,João José. |
| No sistema de plantio convencional, a prática anual de revolvimento do solo provoca alterações nas propriedades físicas, como diminuição da porosidade, modificação da estabilidade de agregados e destruição dos canais deixados pelo sistema radicular. No sistema de plantio direto, não há revolvimento do solo. Portanto, a aplicação de calcário, assim como de N, deve ser feita em superfície, em razão da impossibilidade de sua aplicação em profundidade. Objetivou-se com este trabalho estudar a movimentação de NO- e NH+ em colunas de solo indeformado, com e sem aplicação de calcário. Conduzido em casa-de-vegetação, utilizaram-se tubos de PVC com 0,2 m de diâmetro e 0,2 m de comprimento. As amostras de um Latossolo Vermelho Distrófico típico de textura muito... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lixiviação; Nitrogênio; Colunas de solo. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542004000300008 |
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| Motta,Paulo Emílio Ferreira da; Siqueira,José Oswaldo; Ribeiro,Bruno Teixeira; Norton,Lloyd Darrell; Silva,Sérgio Henrique Godinho; Curi,Nilton. |
| ABSTRACT Phosphorus is a key-nutrient in the fertility management of highly weathered tropical soils. So, this work was carried out with the objective of evaluating the influence of the interaction between P doses, mycorrhizal inoculation and historical land use on soybean growth and P uptake in five Latosols (Oxisols) with contrasting chemical, physical and mineralogical properties under a continuous long-term phosphate fertilization (more than 15 years). The plants were cultivated in 4.5L-plastic pots containing 4 kg of soil in a completely randomized design, four replications and 2x2x2 factorial scheme with two P doses; and with or without mycorrhizal inoculation; and soils cultivated for long periods and non-cultivated (under native vegetation). There... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mycorrhiza; Latosols (Oxisols); Available P; Long-term cultivation. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000400418 |
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| Menezes,Michele Duarte de; Curi,Nilton; Marques,João José; Mello,Carlos Rogério de; Araújo,Alexandre Romeiro de. |
| A aptidão agrícola das terras consiste em uma classificação técnica que identifica o potencial agrícola de utilização das mesmas, considerando as limitações do solo em níveis de manejo diferenciados a partir das informações geradas em um levantamento pedológico. O cruzamento dos dados de aptidão agrícola e uso atual das terras em ambiente SIG (Sistema de Informações Geográficas) consiste numa ferramenta adequada de planejamento, pois permite determinar a inadequação entre uso e aptidão agrícola, dando bases sustentáveis à exploração. Neste estudo, foram realizadas a avaliação da aptidão agrícola das terras e seu uso atual com auxílio de imagens de satélite e observações de campo, e a identificação de Áreas de Preservação Permanente (APPs) em uma sub-bacia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aptidão Agrícola das Terras; Áreas de Preservação Permanente; Taxa de Adequação de Uso. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000600013 |
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| Dijair,Thaís Santos Branco; Silva,Fernanda Magno; Teixeira,Anita Fernanda dos Santos; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton. |
| ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been useful worldwide for determining soil elemental content under both field and laboratory conditions. However, the field results are influenced by several factors, including soil moisture (M), soil texture (T) and soil organic matter (SOM). Thus, the objective of this work was to create linear mathematical models for conversion of Al2O3, CaO, Fe, K2O, SiO2, V, Ti and Zr contents obtained by pXRF directly in field to those obtained under laboratory conditions, i.e., in air-dried fine earth (ADFE), using M, T and SOM as auxiliary variables, since they influence pXRF results. pXRF analyses in field were performed on 12 soil profiles with different parent materials. From them, 59 samples were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PXRF; Soil moisture; Soil texture; Soil organic matter; Prediction models. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100211 |
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| Neves,Cláudia Milene Nascente; Silva,Marx Leandro Naves; Curi,Nilton; Macedo,Renato Luiz Grisi; Moreira,Fátima Maria de Souza; D'Andréa,Alexandre Fonseca. |
| Estudos de qualidade do solo são importantes para o entendimento da interação dessa com o ecossistema como um todo. Nesse contexto, os microrganismos do solo desempenham papel fundamental para manutenção e produtividade de vários agroecossistemas. Objetivou-se, neste trabalho avaliar os atributos biológicos (carbono da biomassa microbiana, respiração basal e quociente microbiano), além do teor de carbono orgânico, possíveis indicadores das alterações na qualidade do solo impostas pelos diferentes sistemas de manejo, em relação ao cerrado nativo, em sistema agrossilvopastoril, no noroeste de Minas Gerais. Foram coletadas amostras, nas profundidades de 0-5, 5-20 e 20-40 cm, de um Latossolo Vermelho Distrófico típico (LVd), entre os municípios de Vazante e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbono da biomassa microbiana; Sistemas de manejo; Cerrado. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000100015 |
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| Registros recuperados: 156 | |
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