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| Registros recuperados: 67 | |
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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, J. C.; NORTON, L. D.; SILVA, M. L. N.; CURI, N.; OLIVEIRA, A. H.; SILVA, M. A. 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... |
| Tipo: Artigo de periódico |
Palavras-chave: Curva característica de umidade em alta energia; Eucalipto; Floresta; Solo tropical; Umidade; Eucalyptus; Forest soils; Tropical soils. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/903131 |
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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, J. M. e; JANTALIA, C. P.; TEIXEIRA, P. C.; POLIDORO, J. C.; BENITES, V. de M.; ARAÚJO, A. P.. |
| 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 soil were... |
| Tipo: Artigo de periódico |
Palavras-chave: Phosphate fertilization; P recovery efficiency; Acúmulo de biomassa; Adubação fosfatada; Eficiência de recuperação de P; Solo tropical; Zea Mays; Biomass production; Tropical soils. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1079152 |
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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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| NEVES, L. V. de M. W.; SANTOS, J. C. B. dos; SOUZA JÚNIOR, V. S. de; CORRÊA, M. M.; ARAUJO FILHO, J. C. de. |
| Nitisols are livelihood sources of agricultural and socio-economic development in several underdeveloped countries worldwide, including Brazil. Brazilian Nitisols are usually associated with basaltic rocks found in the Southern and Southeastern regions of the country. However, Nitisols derived from basalt also occur on the southern coast of Pernambuco state, a region under full urban, agricultural, and industrial development. Aiming to understand the relationship between climate and attributes of Nitisols from the southern coast of Pernambuco, we performed morphological descriptions, physical and chemical analyzes, iron selective extraction, and soil mineralogy (sand, silt, and clay) for three basaltic soil profiles along a land slope. The results suggest... |
| Tipo: Artigo de periódico |
Palavras-chave: Relação solo-ambiente; Processo de xantização; Soil-environment relationship; Xanthization process; Solo Tropical; Tropical soils. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1091485 |
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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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| Registros recuperados: 67 | |
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