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| Registros recuperados: 48 | |
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| Ćirić,Vladimir; Manojlović,Maja; Belić,Milivoj; Nešić,Ljiljana; Šeremešić,Srdan. |
| Aggregate stability is an important factor of the soil functioning. Greater aggregate stability leads to greater soil organic carbon (SOC) preservation, while SOC acts as a key cementing agent in aggregation processes. The objective of this study was to investigate the effects of native vegetation conversion in soil aggregate stability and SOC concentration. The investigation was conducted in the Vojvodina Province, Serbia, in July 2009. Undisturbed soil samples were taken from Haplic Chernozem, Haplic Fluvisol and Gleyic Vertisol, at a depth ranging from 0 to 20 cm. A completely randomized experimental design was used with three replicates. Each soil type was considered under treatments 1) cropland >100 years, 2) native meadow and 3) native... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggregate stability; Soil organic carbon; Land use change; Soil type; Soil structure. |
| Ano: 2013 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952013000600002 |
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| GUIMARÃES,MARIA DE FÁTIMA; OLIVEIRA,JOSÉ F. DE; TELLES,TIAGO S.; MACHADO,WALQUÍRIA; BARBOSA,GRAZIELA M.C.; TAVARES FILHO,JOÃO. |
| ABSTRACT Retaining sugarcane straw over the soil after harvesting can improve soil structure and increase soil carbon stabilization, mainly in macroaggregates. We evaluated the carbon content in the aggregate classes in areas under burn and no-burn (adopted for five years) sugarcane management systems, focusing on the superficial layer (0.00-0.20 m). The experiment was carried in an Oxisol and the treatments consisted in burnt sugarcane, manual harvest; burnt sugarcane, mechanized harvest; and no-burn, mechanized harvest. The retention of sugarcane straw on the soil surface is justified by the increase in carbon content and carbon stock in the surface layer (0.00-0.20 m) by restructuring of the soil, even though it cannot match the structure of the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane straw; Soil aggregates; Carbon stock; Sand fraction; Soil structure. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502459 |
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| Pires,Luiz F.; Reichardt,Klaus; Cooper,Miguel; Cássaro,Fabio A.M.; Dias,Nivea M.P.; Bacchi,Osny O.S.. |
| Soil pore structure characterization using 2-D image analysis constitutes a simple method to obtain essential information related to soil porosity and pore size distribution (PSD). Such information is important to infer on soil quality, which is related to soil structure and transport processes inside the soil. Most of the time soils are submitted to wetting and drying cycles (W-D), which can cause important changes in soils with damaged structures. This report uses 2-D image analysis to evaluate possible modifications induced by W-D cycles on the structure of damaged soil samples. Samples of three tropical soils (Geric Ferralsol, GF; Eutric Nitosol, EN; and Rhodic Ferralsol, RF) were submitted to three treatments: 0WD, the control treatment in which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil bulk density; Soil water content; Soil porosity; Micromorphology; Soil structure; Compaction. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100016 |
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| Ribeiro,Bruno Teixeira; Lima,José Maria de; Mello,Carlos Rogério de; Sá,Marcos Aurélio Carolino de; Oliveira,Geraldo César de. |
| The aim of this work was to compare aggregate disruption of undisturbed soil samples by ultrasonic energy to aggregate disruption caused by the energy of simulated raindrops, to provide equations that can describe this relationship, and to evaluate whether aggregate stability, expressed by sonication method, may be used to estimate the effect that raindrops have on undisturbed soil samples. Undisturbed soil samples from A, Bi and C horizons of a Cambisol were submitted to different levels of ultrasonic energy and simulated raindrops. Sieved samples (aggregates) were also submitted to different levels of ultrasonic energy so that both disturbed and undisturbed conditions of samples could be compared. The results showed that the method using ultrasonic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggregation; Soil structure; Ultrasound. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000300021 |
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| Pais,Paula Sant'Anna Moreira; Dias Junior,Moacir de Souza; Dias,Adriana Cristina; Iori,Piero; Guimarães,Paulo Tácito Gontijo; Santos,Gislene Aparecida dos. |
| It is essential to know the levels of pressure applied to the soil by different weed managements to adapt the management of coffee plantations in a sustainable manner. The objectives of this study were: a) to generate load-bearing capacity models of a Red-Yellow Latosol (Oxisol) submitted to different weed managements and b) to determine which weed management resulted in higher compression. The study was conducted at the Experimental Farm of EPAMIG, located near the community Farias, in Lavras-MG (latitude 21° 14' 43" S and longitude 44° 59' 59" W and altitude of 919 m). The soil is a Red-Yellow Latosol (LVA) cultivated with coffee plantation using Topazio MG 1190 coffee variety, since 2006. We evaluated five weed managements, three being through... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffee culture; Soil compaction; Sustainability; Preconsolidation stress; Soil structure. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000200005 |
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| Passoni,Sabrina; Borges,Fernando da Silva; Pires,Luiz Fernando; Saab,Sérgio da Costa; Cooper,Miguel. |
| In the soil science, a direct method that allows the study of soil pore distribution is the bi-dimensional (2D) digital image analysis. Such technique provides quantitative results of soil pore shape, number and size. The use of specific softwares for the treatment and processing of images allows a fast and efficient method to quantify the soil porous system. However, due to the high cost of commercial softwares, public ones can be an interesting alternative for soil structure analysis. The objective of this work was to evaluate the quality of data provided by the Image J software (public domain) used to characterize the voids of two soils, characterized as Geric Ferralsol and Rhodic Ferralsol, from the southeast region of Brazil. The pore distribution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil structure; Image analysis; Thin section; Soil porous system; Soil pore size distribution; Ferralsols. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000200003 |
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| Braga,Rafael Malfitano; Dias Junior,Moacir de Souza; Braga,Francisco de Assis; Protásio,Thiago de Paula. |
| Planted forests have been increasingly highlighted in the Brazilian scenario, maintaining status regarding their environmental effects, among them those related with soils. The objectives of this work were to evaluate and to compare the physical attributes of a typic distroferric Red Latosol under Eucalyptus cloeziana, E. grandis, E. Pilularis and Corymbia maculata coverage, 37 years after being planted at the Federal University of Lavras campus. The soil profiles were sampled down to 1 m depth in order to analyze their particle-size distribution, porosity, structure and water retention. The results were submitted to analysis of variance, Scott-Knott multiple means comparison test, correlations and linear regression. The profiles presented appropriated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil porosity; Soil structure; Water retention in soil. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000400004 |
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| Navarro Bravo, Agustín. |
| El manejo físico o laboreo del suelo se hace para crear condiciones óptimas en la zona de raíces de las plantas, a través de una adecuada estructura, porosidad, infiltración y retención de agua, entre otras, que son importantes para el manejo sustentable del recurso suelo. Para la identificación de indicadores físicos del suelo para la producción de cultivos, se utilizaron técnicas tradicionales y no destructivas de análisis tales como: la reflectometría de dominio del tiempo (TDR) y el penetrómetro de ultrasonido (PU) que garantizan la medición rápida de algunas propiedades físicas del suelo. Bajo este enfoque, se evaluó un agroecosistema de haba-maíz-frijol en rotación manejado con labranza de conservación, en el Colegio de Postgraduados, Montecillo,... |
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Palavras-chave: Estructura del suelo; Rendimiento de grano; Sostenibilidad; Grain yield; Soil structure; Sustainability; Doctorado; Edafología. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/60 |
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| Navarro Bravo, Agustín. |
| El manejo físico o laboreo del suelo se hace para crear condiciones óptimas en la zona de raíces de las plantas, a través de una adecuada estructura, porosidad, infiltración y retención de agua, entre otras, que son importantes para el manejo sustentable del recurso suelo. Para la identificación de indicadores físicos del suelo para la producción de cultivos, se utilizaron técnicas tradicionales y no destructivas de análisis tales como: la reflectometría de dominio del tiempo (TDR) y el penetrómetro de ultrasonido (PU) que garantizan la medición rápida de algunas propiedades físicas del suelo. Bajo este enfoque, se evaluó un agroecosistema de haba-maíz-frijol en rotación manejado con labranza de conservación, en el Colegio de Postgraduados, Montecillo,... |
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Palavras-chave: Estructura del suelo; Rendimiento de grano; Sostenibilidad; Grain yield; Soil structure; Sustainability; Doctorado; Edafología. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/60 |
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| Magalhães,Wellington de A.; Freddi,Onã da S.; Wruck,Flávio J.; Petter,Fabiano A.; Tavanti,Renan F. R.. |
| ABSTRACT Assess the physical quality of agricultural soils it is important to establish the management more adequate for plant growth. In this study, the soil water retention curve and S index as indicators of soil physical quality were evaluated in five integrated production systems in the following forestry arrangements: Eucalyptus in a single line, double line and triple line (Eucalyptus I, II and III respectively), Balsa in triple line and Teak triple line. The density and arrangement of forest trees influence the soil physical properties. Less soil water retention was observed in the Teak and Balsa wood systems in the layers 0-0.10 and 0.10-0.20 m. The field capacity, permanent wilting point, and available water were lower under the projection from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Pore size distribution; Soil structure; ICLF. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100064 |
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| OTTONI, M. V.; SOUZA, L. R.; BARBOSA, S. M.; ANDRADE, R.; TEIXEIRA, W. G.; INDA, A. V.; CURI, N.. |
| The association between the mineralogy of the clay fraction, the structure and the physico-hydraulic behavior of the Brazilian Latosols (Oxisols) is addressed here in a global, simple, objective, and instructive context. The simplicity of the mineralogical composition of the clay fraction of Latosols facilitates the understanding of cause and effect relationships in this context. Higher kaolinite contents favor the manifestation of the blocky structure, resulting in higher bulk density values, lower water infiltration rates, and lower potential aquifer recharge. Conversely, higher levels of gibbsite and Fe-oxide minerals (mainly hematite and goethite), in this order, favor the small granular structure of high stability in the subsurface horizon (B) of the... |
| Tipo: Folhetos |
Palavras-chave: Solos Temperados; Mineralogia; Estrutura do Solo; Oxisol; Soil structure; Mineralogy; Oxisols; Temperate soils. |
| Ano: 2024 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1163287 |
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| RALISCH, R.; DEBIASI, H.; FRANCHINI, J. C.; TOMAZI, M.; HERNANI, L. C.; MELO, A. da S.; SANTI, A.; MARTINS, A. L. da S.; DE BONA, F. D.. |
| A estrutura do solo é a forma como as partículas minerais (areia, silte e argila) e orgânicas do solo estão organizadas no espaço (Dexter, 1988). A estrutura também se refere ao padrão de arranjo das partículas primárias em unidades estruturais, os agregados, os quais são separados entre si por superfícies de fraqueza, ou apenas superpostos e sem conformação definida (Santos et al., 2013). A estrutura é um dos principais componentes da fertilidade do solo, refletindo, de forma imediata, os efeitos do manejo ao qual esse recurso é submetido. Avaliada nas camadas superficiais, proporciona indicações sobre a interação soloatmosfera. Métodos visuais objetivos e reprodutíveis de diagnóstico da qualidade estrutural do solo com base em medições de campo têm sido... |
| Tipo: Parte de livro |
Palavras-chave: DRES; Estrutura do solo; Fertilidade do solo; Soil structure; Soil fertility. |
| Ano: 2017 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1107195 |
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| Dorner,J; Sandoval,P; Dec,D. |
| A Typic Hapludult was used to evaluate the effect of soil structure and different bulk densities (reached after the destruction of macro aggregates) on functional characteristics of the pore system. The water retention curve, pore-size distribution, shrinkage curve and index were determined in disturbed and structured samples. To evaluate the effect of soil structure on the continuity of the pore system the air permeability at different matrix potentials was measured. From the relationship between the air permeability and air-filled porosity, pore continuity indexes were calculated. The destruction of the soil structure affects the function of its pores. The amount of air-filled pores increased with the reduction of the bulk density, however, the stability... |
| Tipo: Journal article |
Palavras-chave: Soil structure; Pores; Air permeability; Ultisol. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000200009 |
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| Rech,Cleber; Albuquerque,Jackson Adriano; Corrêa,Juliano Corulli; Mafra,Alvaro Luiz; Bortolini,Diego. |
| Abstract: The objective of this work was to evaluate the superficial and injected applications of swine slurry and urea to the soil, regarding their effects on the physical properties of a Nitossolo Vermelho distroférrico under a no-tillage system. The treatments were: injected slurry into the groove with a liquid swine slurry injector (LSSI); slurry on surface, applied on the lines by the LSSI kept raised; urea injected by opening the groove with the LSSI and distributed manually; and corn, under no-tillage, as a control. Sowing and the injection of liquid slurry or urea do not modify the organic carbon content, pH, and aggregation, but alter the soil bulk density and porosity in the mobilized line, and increase the macropores. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Porosity; Soil structure; Urea. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400518 |
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| Registros recuperados: 48 | |
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