Consulta: subjectFacets:"Soil porosity"
Registros recuperados: 24
Data/hora: 03/06/2024 17:54:34

Physical properties of soils and soybean yields after planting cover crops
Provedor de dados: 70
Autores: SANTOS,DIEGO DOS; SOUZA,EDUARDO G. DE; NÓBREGA,LÚCIA H. P.; BAZZI,CLAUDIO L.; QUEIROZ,FERNANDO N. DE.
Cover crops are important for improving soil quality. However, soil properties usually have some spatial dependence. Thus, this study aimed to evaluate the effect of winter cover crops on physical properties of soil and soybean yields using thematic maps. Five winter treatments were used: black oats; intercropping 1 (forage turnips and black oats); intercropping 2 (forage turnips, black oats and common vetch); wheat; and control. Macroporosity, microporosity, total porosity, bulk density and water content of the soil from 0 - 0.1 m depths were evaluated after the winter cover crop management. Soybeans were sown over the entire area in the summer after the winter cover crop management, and the soybean yield was determined for each treatment. Maps for each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil porosity; Bulk density; Crop rotation.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000200280

Chemical and hydrophysical attributes of an Oxisol under coffee intercropped with brachiaria in the Cerrado
Provedor de dados: 86
Autores: Rocha,Omar Cruz; Ramos,Maria Lucrécia Gerosa; Veiga,Adriano Delly; Guerra,Antonio Fernando; Bartholo,Gabriel Ferreira; Rodrigues,Gustavo Costa; Silva,Juliano Escobar da.
Abstract The objective of this work was to evaluate the effect of irrigation and of the presence of brachiaria (Urochloa decumbens) between coffee (Coffea arabica) rows on coffee yield and on chemical and hydrophysical attributes of a Typic Haplustox. The study was conducted in the Cerrado region in Planaltina, Brasília, DF, Brazil, in a randomized complete block design, arranged in split-split plots, with four replicates. Water regimes (irrigated or rainfed) were assigned to the main plots, inter-row management systems to the subplots, and soil layers to the sub-subplots. The following soil attributes were determined: total organic carbon, total nitrogen, C/N ratio, carbon and nitrogen stocks, bulk density, aggregate stability, total porosity,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Urochloa decumbens; Cover crops; Soil physical quality; Soil porosity; Water availability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901476

Nitrogen availability, water-filled pore space, and N2O-N fluxes after biochar application and nitrogen fertilization
Provedor de dados: 86
Autores: Carvalho,Márcia Thaís de Melo; Madari,Beáta Emoke; Bastiaans,Lammert; Oort,Pepijn Adrianus Johannes van; Leal,Wesley Gabriel de Oliveira; Souza,Diego Mendes de; Santos,Roberto Carlos dos; Matsushige,Iva; Maia,Aline de Holanda Nunes; Heinemann,Alexandre Bryan; Meinke,Holger.
Abstract The objective of this work was to investigate the impact of the application of wood biochar, combined with N fertilizations, on N2O-N fluxes, nitrogen availability, and water-filled pore space (WFPS) of a clayey Oxisol under rice (wet season) and common bean (dry season) succession. Manual static chambers were used to quantify N2O-N fluxes from soil immediately after a single application of wood biochar (32 Mg ha-1) and after four crop seasons with N applications (90 kg ha-1 N). Soil ammonium (N-NH4+) and nitrate (N-NO3-) availability, as well as WFPS, was measured together with N2O-N fluxes. There was no interaction between biochar and N fertilization regarding N2O-N fluxes in any of the four seasons monitored, although these fluxes were clearly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cropping systems; Gas fluxes; Greenhouse gases; Nitrate and ammonium; Soil amendment; Soil porosity.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901203

THREE DIMENSIONAL CHARACTERIZATION OF SOIL MACROPOROSITY BY X-RAY MICROTOMOGRAPHY
Provedor de dados: 90
Autores: Passoni,Sabrina; Pires,Luiz Fernando; Heck,Richard; Rosa,Jadir Aparecido.
Analysis of the soil pore system represents an important way of characterizing soil structure. Properties such as the shape and number of pores can be determined through soil pore evaluations. This study presents a three-dimensional (3D) characterization of the shape and number of pores of a sub-tropical soil. To do so, a second generation X-ray microtomograph equipped with a plain type detector was employed. A voltage of 120 kV and current of 80 mA was applied to the X-ray tube. The soil samples analyzed were collected at three different depths (0-10, 10-20, and 20-30 cm). The results obtained allowed qualitative (images) and quantitative (3D) analyses of the soil structure, revealing the potential of the microtomographic technique, as well as the study...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil structure; Pore size distribution; Soil porosity; Image analysis; Soil microstructural components.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200448

Soil tillage systems: changes in soil structure and crop response
Provedor de dados: 90
Autores: Mazurana,Michael; Levien,Renato; Müller,Jônatan; Conte,Osmar.
The introduction and intensification of no-tillage systems in Brazilian agriculture in recent decades have created a new scenario, increasing concerns about soil physical properties. The objective of this study was to assess the effects of different tillage systems on some physical properties of an Ultisol previously under native grassland. Five tillage methods were tested: no-tillage (NT), chiseling (Ch), no-tillage with chiseling every two years (NTCh2), chiseling using an equipment with a clod-breaking roller (ChR) and chiseling followed by disking (ChD). The bulk density, macroporosity, microporosity and total porosity, mechanical resistance to penetration, water infiltration into the soil and crop yields were evaluated. The values of soil bulk...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil bulk density; Soil resistance to penetration; Soil porosity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400013

Irrigation with domestic wastewater: a multivariate analysis of main soil changes
Provedor de dados: 90
Autores: Gloaguen,Thomas Vincent; Gonçalves,Roberta Alessandra Bruschi; Forti,Maria Cristina; Lucas,Yves; Montes,Célia Regina.
Irrigation with treated domestic sewage wastewater (TSE) is an agricultural practice to reduce water requirements of agroecossystems and the nutrient load impact on freshwaters, but adverse effects on soil chemical (salinization, sodification, etc.) and soil physical properties (alteration in soil porosity and hydraulic conductivity, etc.) have been reported. This study aimed to define some relationships among these changes in an Oxisol using multivariate analysis. Corn (Zea mays L.) and sunflower (Helianthus annuus L.) were grown for two years, irrigated with TSE. The following soil properties were determined: Ca2+; Mg2+; Na+; K+ and H + Al contents, cationic exchangeable capacity (CEC), sum of bases (SB), base saturation (V), texture (sand, silt and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil porosity; Soil sodicity; Factor analysis.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400038

Hydro-Physical Properties of a Typic Hapludult under the Effect of Rice Husk Ash
Provedor de dados: 90
Autores: Islabão,Gláucia Oliveira; Lima,Cláudia Liane Rodrigues de; Vahl,Ledemar Carlos; Timm,Luis Carlos; Teixeira,Juliana Brito da Silva.
ABSTRACT The combustion of rice husk generates a partially burnt mixture called rice husk ash (RHA) that can be used as a source of nutrients to crops and as a conditioner of soil physical properties. The objective of this study was to evaluate the effect of RHA levels on the hydro-physical properties of a Typic Hapludult. The experimental design was composed of random blocks with four replications, which comprised plots of 24 m2 and treatments with increasing RHA rates: 0, 40, 80 and 120 Mg ha-1. Undisturbed soil samples were collected in the soil layers of 0.00-0.10 and 0.10-0.20 m after nine months of RHA application, using steel cylinders (0.03 m of height and 0.047 m of diameter). These samples were used to determine soil bulk density (Bd), total soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulk density; Soil porosity; Available water capacity; Soil compressibility; Soil aggregation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100407

Physical Properties of Soil Structures Identified by the Profil Cultural under Two Soil Management Systems
Provedor de dados: 90
Autores: Macedo,Sônia de Fátima Schilickmann; Grimaldi,Michel; Medina,Cristiane Conti; Cunha,José Edézio da; Guimarães,Maria de Fátima; Tavares Filho,João.
ABSTRACT Soil structure plays an important role in water retention, infiltration capacity, porosity, and penetration resistance. The aim of this study was to evaluate the unsaturated hydraulic conductivity and physical properties of Oxisol soils (bulk density and macro-, micro-, and total porosity) in the structures identified using the profil cultural method in areas under two different management practices (perennial pasture and sugarcane). Three pits were dug in each plot to find out how homogeneous morphological structural units (HMSU) were organized in the soil. Next, unsaturated hydraulic conductivity (Ki) was measured in situ inside each HMSU using a triple-ring infiltrometer at multiple suction. Six samples were collected (two samples for each kind...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil use; Compaction; Soil bulk density; Soil porosity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100524

Liquid Bovine Biofertilizer and Cultivation Effects on the Porosity of a Typic Haplocambids as a Function of Cultivation and Dose
Provedor de dados: 90
Autores: Alencar,Thiago Leite de; Chaves,Arilene Franklin; Freire,Alcione Guimarães; Assis Júnior,Raimundo Nonato de; Mota,Jaedson Cláudio Anunciato.
ABSTRACT The soil porous space is where processes related to gases and soil solution occur, and provides an adequate guide for agricultural practices. This study aimed to evaluate the integrated effects of cultivation and the application of liquid bovine biofertilizer on the porous network of a Typic Haplocambids (Cambissolo Háplico Ta Eutrófico) cultivated with figs (Ficus carica L.). Four treatments were evaluated (under fig cultivation with the application of 20, 40 and 60 % of biofertilizer through irrigation, a control treatment without biofertilizer and an additional treatment – soil under natural vegetation). Disturbed and undisturbed soil samples were collected in three soil layers (0.0-0.1, 0.1-0.2 and 0.2-0.3 m) with four replicates. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physics; Soil porosity; Organic matter.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100414

Pore size distribution in soils irrigated with sodic water and wastewater
Provedor de dados: 90
Autores: Gonçalves,Roberta Alessandra Bruschi; Gloaguen,Thomas Vincent; Folegatti,Marcos Vinicius; Libardi,Paulo Leonel; Lucas,Yves; Montes,Célia Regina.
Soil porosity, especially pore size distribution, is an important controlling factor for soil infiltration, hydraulic conductivity, and water retention. This study aimed to verify the effect of secondary-treated domestic wastewater (STW) on the porosity of a sandy loam Oxisol in the city of Lins, state of São Paulo, Brazil. The two-year experiment was divided into three plots: soil cultivated with corn and sunflower and irrigated with STW, soil cultivated and irrigated with sodic groundwater, and non-irrigated and non-cultivated soil (control). At the end of the experiment, undisturbed core samples were sampled from 0 to 2.0 m (8 depths). The water retention curves were obtained by tension plates and Richard's pressure plate apparatus, and the pore size...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sodic wastewater; Soil porosity; Clay dispersion; Soil sodicity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300011

Influence of physical attributes and pedotransfer function for predicting water retention in management systems
Provedor de dados: 91
Autores: Auler,André C.; Pires,Luiz F.; Pineda,Maria C.
ABSTRACT The aims of this study were to evaluate the effects of the soil structural physical attributes on the water retention and to develop pedotransfer functions (PTFs) for the estimation of the soil water content (θ) at different matric potentials of a Dystrophic Red Latosol (Hapludox) under conventional tillage (CT) and no-tillage (NT) soil management systems. The effects of long-term CT and NT (over 25 years) management on the soil bulk density (BD), total porosity (TP), macroporosity (Ma), microporosity (Mi) and water retention were investigated. The PTFs were developed to predict θ and used to evaluate the soil water retention curve only for the NT system. The NT system was characterized by smaller values of the soil BD and higher values of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-tillage; Conventional tillage; Soil porosity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100746

Nanoparticles and nanostructure morphology of a Red Latosol in rehabilitation
Provedor de dados: 91
Autores: Souto Filho,Sebastião N.; Alves,Marlene C.; Monreal,Carlos M.; Bonini,Carolina dos S. B.
ABSTRACT In the process of rehabilitation of a soil, two points are fundamental: to define optimal interferences to accelerate the rehabilitation process and the most appropriate indicators to diagnose its quality. Therefore, this study aimed to investigate the nanoparticle and nanostructure morphology of a Red Latosol in rehabilitation for eight years. The soil under rehabilitation process was compared with its natural state and degraded. In the topsoil, nanoparticles (ø &lt; 100 nm) and fine clay (ø &lt; 200 nm) were quantified and the nanostructures morphology was studied using images obtained by transmission electron microscopy. Soil porosity, bulk density and carbon, nitrogen and hydrogen contents were analyzed. It was found that the nanoparticles and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degraded soil; Sewage sludge; Electron microscopy; Soil porosity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800530

S-Index as an indicator of physical quality in soils of the Paraná state
Provedor de dados: 91
Autores: Caviglione,João H.
ABSTRACT From the 1990s, the demand for soil quality indicators has increased with the agricultural sustainability approaches. The S-index was proposed as an indicator of soil physical quality. The objective was to evaluate the sensitivity of S-index as an indicator of soil physical quality and its correlation with bulk density, organic carbon content, macroporosity, microporosity, total porosity and clay, sand and silt contents, under field conditions in the diversity of the Paraná state. Samples were collected from 21 sites with textures from clay and heavy clay, in the layers of 0-0.1 and 0.1-0.2 m, in soil under native forest and in cultivated soil. Eight soil physical attributes were determined. A soil-water retention curve with six moisture points...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil-water retention curve; Soil structure; Soil porosity; Van Genuchten-Mualem.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000700458

Savanna woodland soil micromorphology related to water retention
Provedor de dados: 63
Autores: Juhász,Carlos Eduardo Pinto; Cooper,Miguel; Cursi,Patrícia Ribeiro; Ketzer,André Oppitz; Toma,Raul Shiso.
The limiting factors of the Brazilian savanna physical environment have been largely discussed. Soil morphology is fundamental to understand the behavior of soil water flow, soil physical properties and soil-landscape relationships. The aim of this study is to relate soil micro and macromorphologic attributes to soil water retention on a toposequence under native savanna woodland (cerradão) in a permanent plot of 320 m &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 320 m installed in Assis, SP, Brazil. Samples collected at five points within the toposequence were used to determine the soil macroporosity by means of image analyses, estimated total porosity, chemical analysis, particle size distribution analysis and soil water retention. From the summit down to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Soil porosity; Soil water flow; Soil physical quality; Toposequence.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400005

Soil CO2 emission of sugarcane fields as affected by topography
Provedor de dados: 63
Autores: Brito,Liziane de Figueiredo; Marques Júnior,José; Pereira,Gener Tadeu; Souza,Zigomar Menezes; La Scala Júnior,Newton.
The spatial and temporal variation of soil CO2 emission is influenced by several soil attributes related to CO2 production and its diffusion in the soil. However, few studies aiming to understand the effect of topography on the variability of CO2 emissions exist, especially for cropping areas of tropical regions. The objective of this study was to evaluate the spatial and temporal changes of soil CO2 emission and its relation to soil attributes in an area currently cropped with sugarcane under different relief forms and slope positions. Mean CO2 emissions in the studied period (seven months) varied between 0.23 and 0.71, 0.27 and 0.90, and 0.31 and 0.80 g m-2 h-1 of CO2 for concave (Conc), backslope (BackS) and footslope (FootS) positions, respectively....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Temporal variation; Spatial variation; Soil attributes; Soil porosity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100011

Atributos físicos de um Hapludox em função de sistemas de produção integração lavoura-pecuária (ILP), sob plantio direto - DOI: 10.4025/actasciagron.v32i1.926
Provedor de dados: 1
Autores: Spera, Silvio Tulio; EMBRAPA; Santos, Henrique Pereira dos; EMBRAPA; Fontaneli, Renato Serena; EMBRAPA; Tomm, Gilberto Omar; EMBRAPA.
Alguns atributos físicos do solo foram avaliados, após oito anos da instalação do experimento (1995 a 2003), num Latossolo Vermelho distrófico típico, em Coxilha, Estado do Rio Grande do Sul, em seis sistemas de produção de grãos com pastagens anuais de inverno e de verão: sistema I (trigo-soja / pastagem de aveia preta + ervilhaca-milho); sistema II (trigo-soja / pastagem de aveia preta + ervilhaca + azevém-milho); sistema III (trigo-soja / pastagem de aveia preta + ervilhaca-pastagem de milheto); sistema IV (trigo-soja / pastagem de aveia preta + ervilhaca + azevém-pastagem de milheto); sistema V (trigo-soja / aveia branca-soja / pastagem de aveia preta + ervilhaca-pastagem de milheto); e sistema VI (trigo-soja / aveia branca-soja / pastagem de aveia...
Palavras-chave: 5.01.00.00-9    Agronomia integração lavoura/pecuária; Densidade de solo; Porosidade em experiência na área de Agronomia  com ênfase em Física do Solo  atuando principalmente nos seguintes temas: cerrado  integração lavoura-pecuária  uso da terra  aptidão agrícola e sistema plantio direto. lay farming; Soil bulk density; Soil porosity.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/926

3D soil void space lacunarity as an index of degradation after land use change
Provedor de dados: 1
Autores: Santos, Carlos Renato dos; Antonino, Antônio Celso Dantas; Heck,  Richard John; Lucena, Leandro Ricardo Rodrigues de; Oliveira, Alex Cristóvão Holanda de; Silva, Antonio Samuel Alves da; Stosic, Borko; Menezes, Romulo Simões Cezar.
In this work, lacunarity analysis is performed on soil pores segmented by the pure voxel extraction method from soil tomography images. The conversion of forest to sugarcane plantation was found to result in higher sugarcane soil pore lacunarity than that of native forest soil, while the porosity was found to be lower. More precisely, this study shows that native forest has more porous soil with a more uniform spatial distribution of pores, while sugarcane soil has lower porosity and a more heterogeneous pore distribution. Moreover, validation through multivariate statistics demonstrates that lacunarity can be considered a relevant index of clustering and can explain the variability among soils under different land use systems. While porosity by itself...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lacunarity; Soil porosity; Impact of land use change. lacunarity soil porosity impact of land use change.
Ano: 2020
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42491

Cultivares de soja sob plantio direto em Latossolo Vermelho compactado - DOI: 10.4025/actasciagron.v31i4.851
Provedor de dados: 1
Autores: Giarola, Neyde Fabíola Balarezo; UEPG; Brachtvogel, Elizeu Luiz; UNIOESTE; Fontaniva, Silvano; UNIOESTE; Pereira, Regina Alves; UNIOESTE; Fioreze, Samuel Luiz; UNIOESTE.
O processo de compactação pode modificar os atributos físicos do solo a ponto de limitar o potencial genético de desenvolvimento de culturas agrícolas ou de cultivares mais sensíveis. O objetivo deste trabalho foi avaliar, em Latossolo Vermelho Eutroférrico típico, a resposta de parâmetros de produção de cultivares de soja (Glycine Max L. Merrill) e atributos físicos do solo ao sistema plantio direto em condições de lavoura e com compactação adicional. O estudo foi conduzido na C-Vale Cooperativa Agroindustrial, em Palotina, Estado do Paraná. Foram avaliados dois tratamentos de solo: sistema plantio direto sem compactação adicional (SPD-C0) e sistema plantio direto com compactação adicional (PD-C1), e cinco cultivares de soja: (1) Coodetec 204, (2)...
Tipo: Pesquisa Empirica de Campo
Palavras-chave: 5.01.03.04-0    Produção de Mudas densidade do solo; Porosidade do solo; Glycine max L. Merrill; Compactação do solo 5.01.01.06-4 bulk density; Soil porosity; Glycine max L. Merril; Soil compaction.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/851

Gamma-ray computed tomography to evaluate changes in the structure of a clayey soil due to agricultural traffic - doi: 10.4025/actasciagron.v33i3.4727
Provedor de dados: 1
Autores: Pires, Luiz Fernando; Universidade Estadual de Ponta Grossa.
A first generation gamma-ray computed tomography (CT) equipped with a 137Cs source was used to investigate changes in soil structure due to agricultural machinery traffic. Core samples with volume of 55 cm3 were collected at the surface (0-10 cm) of a Brazilian clayey soil. Significant alterations in soil structure occurred after two passages of tractor wheels, with important decreases in soil porosity. CT data allowed a continuous analysis of soil bulk density and also soil porosity distribution for 1.25 and 1.20 mm layers, which cannot be provided by traditional methods commonly used in soil physics.
Palavras-chave: 5.01.01.02-1; 3.09.01.00-6 gamma-ray attenuation; Soil bulk density; Soil porosity; Image analysis; Soil physics Física dos Solos gamma-ray attenuation; Soil bulk density; Soil porosity; Image analysis; Soil physics.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4727

Soil pore distribution as affected by cattle trampling under no-till and reduced-till systems
Provedor de dados: 114
Autores: Iglesias,J.O; Galantini,J.A; Krüger,H; Venanzi,S.
Soil pore size affects soil air and water dynamics, and thus influence crop productivity. The aim of this study was to evaluate the impact of reduced-tillage (RT) and no-tillage (NT) systems on soil pore distribution under animal grazing. The soil was sampled at 0-5, 5-10, 10-15 and 15-20 cm depths before and after animal grazing. Bulk density, total porosity and the volume of three pore sizes (macropores, mesopores and micropores) were determined. Differences in total porosity between both tillage systems were statistically significant (P&lt;0.01) in the top 10 cm layer before grazing. Lower total porosity in NT could be related to the effect of previous years&amp;#8217;grazing. In RT, disk operations before planting the oat (Avena sativa) crop increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil porosity; Animal trampling; Semiarid regions.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1668-298X2014000200004

Pore system changes of damaged Brazilian oxisols and nitosols induced by wet-dry cycles as seen in 2-D micromorphologic image analysis
Provedor de dados: 42
Autores: 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

Water retention curve to analyze soil structure changes due to liming
Provedor de dados: 42
Autores: FERREIRA,TALITA R.; PIRES,LUIZ F.; AULER,ANDRÉ C.; BRINATTI,ANDRÉ M.; OGUNWOLE,JOSHUA O.
Abstract: Liming can influence crop growth by altering pore geometry, pore size distribution and water retention characteristics in acid soils. The aim of this work is to determine liming effects on the soil structure based on analysis of water retention data using a cubic spline adjustment function. For that, the authors investigated the effect of three lime rates (0, 15 and 20 t ha-1) on soil water retention characteristics and pore size distribution of a silty-clay “Cambissolo Háplico Alumínico” (Dystrudept) located in the SE region of the Paraná State, Brazil. Soil cores were collected after 31 months of the experiment at 0-10 cm and 10-20 cm soil layers. Eleven matric potentials (from 0 to -7000 cm H2O) were employed to calculate soil water retention...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water retention; Pore size distribution; Soil porosity; Acid soils.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500852

Winter cover crops affecting physical and chemical soil attributes in a commercial vineyard
Provedor de dados: 65
Autores: Veiga,Milton da; Feldberg,Nelson Pires; Nava,Gilberto; Bettoni,Jean Carlos.
ABSTRACT: Cover crops may have direct or indirect effects on the physical and chemicalsoil attributes; these cropsplay a key role in the cycling of nutrients in the soil and add labile organic carbon, bringing economic and environmental benefits to the system. To study the effect of cover crops on the physical and chemical properties of an Oxisol, a three-year experiment was conducted in a commercial vineyard located at Epagri’s Experimental Station in Videira, SC, Brazil. Different winter species (white clover, red clover, common vetch, turnip, corn spurrey, black oat, rye, and ryegrass) were sown in addition to treatments with manual weeding or mechanical mowing. Certain chemical and physical attributes of soil were determined in samples collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Nutrients; Bulk density; Soil porosity; Vitis spp.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001200252

Physical attributes of distroferric red latosol under four eucalypt species over the long term
Provedor de dados: 64
Autores: 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