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| Registros recuperados: 42 | |
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| Sakuno,Natanael Rodolfo Ribeiro; Guiçardi,Augusto Cesar Ferreira; Spalevic,Velibor; Avanzi,Junior Cesar; Silva,Marx Leandro Naves; Mincato,Ronaldo Luiz. |
| ABSTRACT The water erosion process has a considerable negative effect on tropical soils, causes soil losses from arable land and reduces the capacity to support surrounding ecosystems. Estimating soil losses caused by water erosion is fundamental for evaluating the impacts of various production systems. Therefore, improving soil loss estimates via the adaptation of models for different edaphoclimatic environments is necessary for estimating local geographic and climatic differences. This study aimed to adapt, apply and evaluate the potentialities of the Potential Erosion Method for Latosols of the Hydrographic Subbasin of Caçús Stream, southern Minas Gerais State. Geological, topographic, pedological, climatic and land use and occupation data were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling of water erosion; RUSLE; Tropical soils. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100409 |
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| Avanzi,Junior Cesar; Norton,Lloyd Darrell; Silva,Marx Leandro Naves; Curi,Nilton; Oliveira,Anna Hoffmann; Silva,Mayesse Aparecida da. |
| The objective of this work was to evaluate the aggregate stability of tropical soils under eucalyptus plantation and native vegetation, and assess the relationships between aggregate stability and some soil chemical and physical properties. Argisols, Cambisol, Latosols and Plinthosol within three eucalyptus-cultivated regions, in the states of Espírito Santo, Rio Grande do Sul and Minas Gerais, Brazil, were studied. For each region, soils under native vegetation were compared to those under minimum tillage with eucalyptus cultivation. The aggregate stability was measured using the high-energy moisture characteristic (HEMC) technique, i.e., the moisture release curve at very low suctions. This method compares the resistance of aggregates to slaking on a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus sp.; High-energy moisture characteristic curve; Forest systems; Tropical soils. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000100012 |
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| Sá,Jerusa Maia e; Jantalia,Cláudia Pozzi; Teixeira,Paulo César; Polidoro,José Carlos; Benites,Vinícius de Melo; Araújo,Adelson Paulo. |
| Abstract: The objective of this work was to evaluate agronomic and P recovery efficiencies of a granulated organomineral phosphate fertilizer (OMF) produced from poultry litter, compared with those of monoammonium phosphate (MAP), in soils with different textures. The experiment followed a 2x2x4+2 factorial arrangement, with two Oxisols (sandy loam and clay loam textures), two sources of P (OMF and MAP), four levels of P (50, 100, 200, and 400 mg kg-1), besides two control treatments without P application. The treatments were evaluated in 10-kg pots filled with soil, during four successive cultivations of corn without replacing the P absorbed by the plants, in order to evaluate the actual and residual effects of the fertilizers. Available P contents in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Biomass accumulation; Phosphate fertilization; P recovery efficiency; Tropical soils. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000900786 |
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| Sombroek,Wim. |
| Thirteen main landform units are distinguished for the whole of the forested Amazon region, each with its specific soil pattern and vegetation structure. These landform-soil-vegetation units are delineated on a small-scale map and illustrated by a schematic cross-section. Floristic diversity of the gamma type is to be highest on the steepland-and-valley complexes of the Andean fringe, on the crystalline shield uplands, on the inselberg complexes, and on the eutric variant of the western sedimentary plains. Endemism is expected to be highest on the sandy plains, and parts of the table lands and inselberg complexes. Speciation, linked to the concept of forest refuge areas, is likely to be highest on the sandstone table lands, on the stretches of Amazon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Major landforms; Tropical soils; Floristic biodiversity. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672000000100081 |
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| Ribeiro,Bruno Teixeira; Nascimento,Diogo Costa; Curi,Nilton; Guilherme,Luiz Roberto Guimarães; Costa,Enio Tarso de Souza; Lopes,Guilherme; Carneiro,João Paulo. |
| ABSTRACT In the Brazilian Cerrado biome, there are wetlands locally known as “Veredas”, which are swampy plains between hills and rivers. Since the 1970’s, the Cerrado biome has been gradually converted to livestock, crop, or forestry production. Until now, very few studies were conducted to evaluate the baseline contents of trace elements in Cerrado wetland soils. Due to their position in the landscape (bottom lands), the wetlands are potentially susceptible to contamination by runoff and/or leaching from surrounding areas at higher altitudes. This work evaluated the As, Cd, Pb, Ni, Zn, Cu, Mn, and Fe contents in soils from six wetlands (undisturbed and disturbed) in the Minas Gerais Triangle region, Brazil. In each wetland, we collected topsoil samples... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Waterlogged soils; Soil contamination; Tropical soils; Heavy metals. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100515 |
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| ALLEONI,LUÍS REYNALDO FERRACCIÚ; CAMARGO,OTÁVIO ANTONIO DE. |
| Boron adsorption was studied in five representative soils (Rhodic Hapludox, Arenic Paleudalf and three Typic Hapludox) from the State of São Paulo, Brazil. Adsorption was higher in the clayey Oxisols, followed by the Alfisol and the coarser Oxisols. Calcium carbonate promoted an increase in the amount of adsorbed boron in all soils, with the most pronounced effect in the coarser-textured Oxisols. High correlation coefficients were found between adsorbed boron and clay and amorphous aluminum oxide contents and specific surface area (r = 0.79, 0.76 and 0.73, respectively, p < 0.01). Clay content, free aluminum oxide, and hot CaCl2 (0.01 mol L-1)-extracted boron explained 93% of the variation of adsorbed boron. Langmuir and Freundlich isotherms fitted well... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tropical soils; Simple correlation; Multiple regression analysis. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000000200020 |
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| CALDERANO FILHO, B.; ANDRADE, A. G. de; MANZATTO, C. V.; CALDERANO, S. B.; SOUZA, J. S. de. |
| O objetivo do trabalho foi realizar o estudo dos solos da área de entorno do reservatório da usina hidrelétrica de Tombos, Estado de Minas Gerais, visando proceder à identificação, caracterização e cartografia dos solos. Os procedimentos utilizados consistiram na delimitação dos principais domínios e/ou padrões fisiográficos, a partir da fotointerpretação de fotografias aéreas, de dados de sensores remotos e do modelo digital de elevação (MDE), principalmente dos dados de altimetria e de declividade. Esse material apoiou a prospecção e cartografia dos solos no campo e verificação dos limites entre as unidades de mapeamento. No domínio das terras altas, foram identificados Argissolos Vermelhos, Vermelho-Amarelos e eventualmente Amarelos, restritos às partes... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Reassentamentos rurais; Modelo digital de elevação; Relações solo-paisagem; Solo Tropical; Classificação do Solo; Tropical soils; Soil classification. |
| Ano: 2006 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1091714 |
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| Bourotte,Christine; Forti,Maria Cristina; Lucas,Yves; Melfi,Adolpho J.. |
| Studies about pollution by Polycyclic Aromatic Hydrocarbons (PAHs) in tropical soils and Brazil are scarce. A study was performed to examine the PAHs composition, concentrations and sources in red-yellow Oxisols of remnant Atlantic Forest of the São Paulo State. Sampling areas were located in an urban site (PEFI) and in a natural one (CUNHA).The granulometric composition, pH, organic matter content and mineralogical composition were determined in samples of superficial soils. The sum of PAHs (ΣHPAs) was 4.5 times higher in the urban area than in the natural one. Acenaphthylene, acenaphthene, fluorene, phenanthrene and fluoranthene have been detected in the soils of both areas and presented similar concentrations. Acenaphthene and fluorene were the most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantic Forest; Polycyclic aromatic hydrocarbons; PAHs; Tropical forest; Tropical soils; Urban soils. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100013 |
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| Alleoni,Luís Reynaldo Ferracciú; Camargo,Otávio Antonio de; Valadares,José Maria Aires Silva. |
| Relationship between soluble boron extracted with a hot CaCl2 0.01 mol L-1 solution and pH; organic carbon; exchangeable cations; cation exchange capacity (CEC); base saturation; total, free and amorphous iron and aluminum oxide contents; clay content; and specific surface area were performed for surface and subsurface samples of five soils. The soils were a Rhodic Hapludox, an Arenic Paleudalf and three Typic Hapludox, all representative soils of the State of São Paulo, Brazil. To quantify the relations between soluble boron and the different soil characteristics, simple linear correlations and multiple regressions, using a stepwise regression program, were performed. Hot-CaCl2 extractable boron (HCB) was significantly correlated with clay content (r =... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soluble boron; Tropical soils; Simple correlation; Multiple regression analysis. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200006 |
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| Maione,Camila; Araujo,Eloá Moura; Santos-Araujo,Sabrina Novaes dos; Boim,Alexys Giorgia Friol; Barbosa,Rommel Melgaço; Alleoni,Luís Reynaldo Ferracciú. |
| ABSTRACT Lettuce (Lactuca sativa) is the main leafy vegetable produced in Brazil. Since its production is widespread all over the country, lettuce traceability and quality assurance is hampered. In this study, we propose a new method to identify the geographical origin of Brazilian lettuce. The method uses a powerful data mining technique called support vector machines (SVM) applied to elemental composition and soil properties of samples analyzed. We investigated lettuce produced in São Paulo and Pernambuco, two states in the southeastern and northeastern regions in Brazil, respectively. We investigated efficiency of the SVM model by comparing its results with those achieved by traditional linear discriminant analysis (LDA). The SVM models outperformed the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ICP–OES; Traceability; Tropical soils; Heavy metals; Feature selection. |
| Ano: 2022 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100901 |
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| Balam Che, Manuel Anastacio. |
| Se ensayaron niveles de fertilización de N,P,K, en Teca (Tectona grandis Linn F.) con un experimento establecido en 2009, en el municipio de Balancán Tabasco. Se probaron tres niveles de cada factor N, P y K generando 27 combinaciones de un experimento factorial y los tratamientos se distribuyeron en un diseño de bloques al azar. En forma paralela se establecieron parcelas aledañas para probar el efecto de la aplicación de micronutrientes. Los niveles de fertilización se identificaron como medios, si correspondían a la dosis aplicada previamente a otras plantaciones y, altos y bajos según se encontraran 50% arriba y debajo de esta dosis. Las variables de respuesta fueron los incrementos de 2010 a 2012, en diámetro y área basal a nivel del suelo, altura... |
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Palavras-chave: Plantaciones tropicales; Suelos tropicales; Crecimiento inicial; Tropical plantations; Tropical soils; Initial tree growth; Forestal; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1859 |
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| Germano,Mariana Gomes; Cannavan,Fabiana de Souza; Mendes,Lucas William; Lima,Amanda Barbosa; Teixeira,Wenceslau Geraldes; Pellizari,Vivian Helena; Tsai,Siu Mui. |
| The objective of this work was to evaluate the catabolic gene diversity for the bacterial degradation of aromatic hydrocarbons in anthropogenic dark earth of Amazonia (ADE) and their biochar (BC). Functional diversity analyses in ADE soils can provide information on how adaptive microorganisms may influence the fertility of soils and what is their involvement in biogeochemical cycles. For this, clone libraries containing the gene encoding for the alpha subunit of aromatic ring-hydroxylating dioxygenases (α-ARHD bacterial gene) were constructed, totaling 800 clones. These libraries were prepared from samples of an ADE soil under two different land uses, located at the Caldeirão Experimental Station - secondary forest (SF) and agriculture (AG) -, and the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Catabolic genes; Genetic diversity; Land use systems; Microbial ecology; Tropical soils. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000500004 |
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| Marra,Leandro M.; Oliveira-Longatti,Silvia M. de; Soares,Cláudio R.F.S.; Lima,José M. de; Olivares,Fabio L.; Moreira,Fatima M.S.. |
| The pH of the culture medium directly influences the growth of microorganisms and the chemical processes that they perform. The aim of this study was to assess the influence of the initial pH of the culture medium on the production of 11 low-molecular-weight organic acids and on the solubilization of calcium phosphate by bacteria in growth medium (NBRIP). The following strains isolated from cowpea nodules were studied: UFLA03-08 (Rhizobium tropici), UFLA03-09 (Acinetobacter sp.), UFLA03-10 (Paenibacillus kribbensis), UFLA03-106 (Paenibacillus kribbensis) and UFLA03-116 (Paenibacillus sp.). The strains UFLA03-08, UFLA03-09, UFLA03-10 and UFLA03-106 solubilized Ca3(PO4)2 in liquid medium regardless of the initial pH, although without a significant difference... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chelation; Propionic acid; Gluconic acid; Tartaric acid; Malic acid; Tropical soils. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200367 |
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| Santos,Hemmannuella Costa; Oliveira,Fábio Henrique Tavares de; Salcedo,Ignácio Hernan; Souza,Adailson Pereira de; Mota Silva,Valério Damásio da. |
| The soil P sorption capacity has been studied for many years, but little attention has been paid to the rate of this process, which is relevant in the planning of phosphate fertilization. The purpose of this experiment was to assess kinetics of P sorption in 12 representative soil profiles of the State of Paraíba (Brazil), select the best data fitting among four equations and relate these coefficients to the soil properties. Samples of 12 soils with wide diversity of physical, chemical and mineralogical properties were agitated in a horizontal shaker, with 10 mmo L-1 CaCl2 solution containing 6 and 60 mg L-1 P, for periods of 5, 15, 30, 45, 60, 90, 120, 420, 720, 1,020, and 1,440 min. After each shaking period, the P concentration in the equilibrium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adsorption; Kinetic equations; Phosphate; Tropical soils; Semi-arid soils. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400024 |
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| Navarrete,Acácio Aparecido; Taketani,Rodrigo Gouvêa; Mendes,Lucas William; Cannavan,Fabiana de Souza; Moreira,Fatima Maria de Souza; Tsai,Siu Mui. |
| The study of the ecology of soil microbial communities at relevant spatial scales is primordial in the wide Amazon region due to the current land use changes. In this study, the diversity of the Archaea domain (community structure) and ammonia-oxidizing Archaea (richness and community composition) were investigated using molecular biology-based techniques in different land-use systems in western Amazonia, Brazil. Soil samples were collected in two periods with high precipitation (March 2008 and January 2009) from Inceptisols under primary tropical rainforest, secondary forest (5-20 year old), agricultural systems of indigenous people and cattle pasture. Denaturing gradient gel electrophoresis of polymerase chain reaction-amplified DNA (PCR-DGGE) using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil microbial ecology; Soil microbiology; Microbial diversity; Land use changes; Tropical soils. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500007 |
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| Registros recuperados: 42 | |
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