Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 40
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
Adensamento subsuperficial em solos do semi-árido: processos geológicos e / ou pedogenéticos. Repositório Alice
SILVA, M. S. L. da; KLAMT, E.; CAVALCANTI, A. C.; KROTH, P. L..
Nos tabuleiros setanejos do Estado de Pernambuco encontram-se solos com adensamento subsuperficial, que provoca limitações no seu uso e, conseqüentemente diminuição da produtividade agrícola. Com o objetivo de identificar a ocorrência de processos geológicos (discontinuidade litológica) e/ou pedogenéticos envolvidos na gênese desse adensamento, selecionaram-se três perfis de solo distribuidos numa seqüência topográfica, localizados nos tabuleiros sertanejos, município de Petrolina, zona semi-árida do Estado de Pernambuco, nos quais foram determinados distribuição granulométrica, morfoscopia da fração areia, parâmetros sedimentológicos, densidade e porosidade, e calculadas as frações areia e silte livres de argila e as relações areia fina, areia média e...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Adensamento; Formação; Recursos naturais; Região semi-árida; Tabuleiro sertanejo; Soils; Compaction; Formation; Semi-arid region; Low plateaus; Solo; Soil.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/130576
Imagem não selecionada

Imprime registro no formato completo
AGRONOMICAL ATTRIBUTES OF SOYBEANS AND SOIL RESISTANCE TO PENETRATION IN NO-TILLAGE AND CHISELED SURFACES REA
Cortez,Jorge W.; Mauad,Munir; Souza,Luiz C. F. de; Rufino,Mauricio V.; Souza,Paulo H. N. de.
ABSTRACT Farming systems may affect soil properties and crop production of components, decreasing yields. This study aimed to assess penetration resistance (PR) and agronomic traits of soybeans under no-tillage (NT) and chiseling (CP). The experiment was carried out in a randomized block with two treatments (tillage and scarification) with 12 repetitions; yet soil penetration resistance (PR) was assessed in a factorial block, considering farming systems and sampling sites (row and interrows). PR was measured with an impact penetrometer, sampling in row and interrows within a 22.5 x 0.1 m2 mesh grid up to 0.60 m depth. The obtained values were higher for NT in the 0.10-0.20 m layer. Great PR values in interrows were only registered within the surface layer....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Soil physics; Chiseling.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100098
Imagem não selecionada

Imprime registro no formato completo
Atributos micromorfologicos de solos do Projeto Jaiba, Norte de Minas Gerais. Repositório Alice
OLIVEIRA, C. V.; KER, J. C.; DUARTE, M. N.; CURI, N.; FONTES, L. E. F..
Amostras indeformadas de horizontes representativos de solos do Projeto Jaíba, norte de Minas Gerais, e camadas compactadas e não compactadas de solos sob uso intensivo foram coletadas e analisadas micromorfologicamente, com vistas em obter maiores informações relativas ao seu grau de evolução e avaliar as alterações causadas nos solos pelo uso agrícola. Foram estudados quatro solos derivados de calcário (P1, P2, P3 e P4) e um originado a partir de sedimentos detríticos (P5), além das camadas com e sem indícios de compactação. A micromorfologia revelou que os solos apresentam características bastante distintas e variáveis, dependendo da classe e do material de origem. O Cambissolo originado de calcário tem como característica marcante o fluxo vertical de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Microestrutura; Compactacao; Sedimento detritico; Compaction; Detritic sediments; Calcário; Solo; Limestone; Microstructure; Soil.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/336476
Imagem não selecionada

Imprime registro no formato completo
Avaliation of the soil preparation quality in minimum cultivation area planted with eucalypt PFB - Pesquisa Florestal Brasileira
Gava, José Luiz.
Evaluations, of the quality of soil preparation in the plantation lines, were made in areas with potential risk of compaction using the penetrometer to collect data about the depth and width of the furrow. The samplings were made in three sites of production of Eucalyptus in areas of Cia Suzano de Papel e Celulose in the state of São Paulo, managed under minimum cultivation of the soil and where crop was mechanized and intensive. The statistical evaluation of the quality was made through the measurement and assessment of the results of the soil preparation, comparing the results with the technical quality standards pre-established by the company. The data were analyzed graphically and statistically. In the graphic analysis of the three sites sampled, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Quality control; Compaction; Soil preparation; Sub soiling Controle de qualidade; Compactação; Preparo de solo; Subsolagem.
Ano: 2003 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1608
Imagem não selecionada

Imprime registro no formato completo
Caracterizacao de um solo submetido a irrigacao por pivo central no Semi-Árido do Brasil. Repositório Alice
SILVA, M. S. L. da; ANJOS, J. B. dos; LOPES, P. R. C.; GOMES, T. C. de A.; SILVA, J. A. M. e..
Com o objetivo de obter subsídios para estabelecer diretrizes de implcmcntação de manejo adequado c racional em agricultura irrigada por pivô central, foi realizada caracterização morfológica, física, química e mineralógica de um solo Argissolo Amarelo localizado em perímetro irrigado do município de Petrolina, Estado de Pcrnambuco, Brasil.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Manejo de solo; Compactacao; Solo; Caracteristica; Irrigacao; Soil management; Compaction; Characteristica; Irrigation; Solo; Soil.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134484
Imagem não selecionada

Imprime registro no formato completo
Changes in water availability in the soil due to tractor traffic REA
Gómez-Rodríguez,Katherine; Camacho-Tamayo,Jesús H.; Vélez-Sánchez,Javier E..
Frequent traffic of tractors in agricultural soils, promotes soil compaction and affects the flow and water availability. The aim of this research was to study the effect of compaction induced by tractor traffic on water availability in the soil under different traffic intensities on the same path (0, 1, 3, 6 and 10 passages), to two tractors with 3.3 and 2.6 ton of weights, over three different surface conditions. The study was conducted in an Andisol, representative soil of the study area. It was determined the behavior of the water retention curve, obtaining the gravitational water, available water and hygroscopic water, to 10 and 30 cm of depth. The hygroscopic water is the most prevalent with values ​​of up to 80% of the total water present in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Soil management; Water retention curve; Andisol.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600008
Imagem não selecionada

Imprime registro no formato completo
Compactação do solo. Repositório Alice
MANTOVANI, E. C..
1987
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Solo; Soil; Compaction.
Ano: 1987 URL: http://www.alice.cnptia.embrapa.br/handle/doc/475654
Imagem não selecionada

Imprime registro no formato completo
Compared performance of penetrometers and effect of soil water content on penetration resistance measurements Rev. Bras. Ciênc. Solo
Mome Filho,Edison Aparecido; Silva,Alvaro Pires da; Figueiredo,Getulio Coutinho; Gimenes,Fernando Henrique Setti; Vitti,André Cesar.
Modern agriculture techniques have a great impact on crops and soil quality, especially by the increased machinery traffic and weight. Several devices have been developed for determining soil properties in the field, aimed at managing compacted areas. Penetrometry is a widely used technique; however, there are several types of penetrometers, which have different action modes that can affect the soil resistance measurement. The objective of this study was to compare the functionality of two penetrometry methods (manual and automated mode) in the field identification of compacted, highly mechanized sugarcane areas, considering the influence of soil water volumetric content (θ) on soil penetration resistance (PR). Three sugarcane fields on a Rhodic Eutrudrox...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sugarcane; Mechanization; Compaction; Soil water content.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300006
Imagem não selecionada

Imprime registro no formato completo
Contribution of water content and bulk density to field soil penetration resistance as measured by a combined cone penetrometer - TDR probe. Repositório Alice
VAZ, C. M. P.; BASSOI, L. H.; HOPMANS, J. W..
Soil strength as measured by cone penetrometers depends on several parameters, but it is mostly affected by the soil water content and bulk density (p). In order to better understand the effect of the water content and bulk density on soil strength we developed a combined penetronieter-coiled TDR probe to determine simultaneously the depth distribution of penetration resistance and water content in a soil profile. Field experiments carried out for a Yolo soil allowed the fitting of the effect and p using a combined power-exponential equation. Using the combined cone penetrometer-TDR probe data, the fitted equation may be used to estimate soil bulk density.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Compactacao; Densidade; Penetracao; Soil moisture; Compaction; Penetration; Resistance; Água; Resistência; Umidade do Solo; Density; Water.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/134462
Imagem não selecionada

Imprime registro no formato completo
Crescimento radicular de plantulas de milho afetado pela resistencia do solo a penetracao. Repositório Alice
ROSOLEM, C.A.; FERNANDEZ, E.M.; ANDREOTTI, M.; CRUSCIOL, C.A.C..
A resistencia do solo a penetracao e relacionada com a textura, compactacao e umidade do solo. No presente trabalho se estudou o efeito da interacao desses fatores sobre o crescimento de raizes de milho. Materiais do solo com 22, 30, 34, 41 e 48% de argila foram acondicionados em tubos de PVC de 10 cm com 4,3 cm de diametro interno, nas densidades globais de 1,07, 1,18, 1,36 e 1,53 g cm-3, em tres tensoes de agua: -0,034, -0,106 e -0,640 MPa. Plantulas de milho foram cultivadas nos tubos por 48 horas. Quando a densidade do solo e baixa, a textura tem papel preponderante no crescimento radicular. Esse efeito e menor a medida que aumenta a densidade global. O aumento da resistencia do solo a penetracao causa diminuicao no comprimento e numero de raizes...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Agua do solo; Compactacao; Densidade global; Textura do solo; Soil water; Compaction; Bulk density; Soil texture.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/88237
Imagem não selecionada

Imprime registro no formato completo
DYNAMIC OF PRESSURE-DEFORMATION CURVE IN UNIAXIAL COMPRESSION TEST IN DIFFERENT LOAD TIMES REA
Mazurana,Michael; Levien,Renato; Zulpo,Lucas; Passos,Gabrielle M.; Kerpen,Hyran S..
ABSTRACT: The loading application time by machinery tires and agricultural tires is one of the factors of soil compaction. We evaluated the effect of loading reduction time in uniaxial compression test, in laboratory, in some physical and mechanical parameters, approaching the loading field condition time by machinery with laboratory tests. Soil samples of two Oxisol and one Paleudult under different years of implementation of no tillage system (NT) and of different layers were collected and subjected to uniaxial compression tests, two times of loading application, 300 seconds per load, according to actual methodology and 30 seconds per load in the laboratory. We analyzed the soil deformation to each load, bulk density, pre-compression stress, recompress...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Loading bearing support; Compaction; Recompression index.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000500973
Imagem não selecionada

Imprime registro no formato completo
Effect of different tillage and residue management practices on growth and yield of corn cultivation in Thailand CIGR Journal
Sornpoon, Wlaiwan; Jayasuriya, Hemantha P. W..
The tillage and residue management during soil bed preparation need to be in appropriate manner for sustainable farming practice.  The effects of tillage and residue management methods on corn cropping were studied on loamy soil in Bangrakum district, Phitsanulok Province, Thailand.  The effects of five commonly used tillage methods: subsoiler tillage (ST), three methods of conventional tillage (CT1, CT2 and CT3), no-tillage (NT), as main factors and two corn residue management methods; burned (R1) and unburned (R2), as sub-factors were studied in a randomized strip plot configuration.  Tillage treatment showed significant effect on physical and chemical soil properties, plant growth and development, grain yield, total aboveground biomass and most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural Engineering; Tillage optimization Tillage; No-tillage; Emergence; Compaction; Subsoiler; Biomass.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2235
Imagem não selecionada

Imprime registro no formato completo
Estimation of precompression stress in an Ultisol cultivated with sugarcane AGRIAMBI
Mendes,Pericles M. B.; Rolim,Mário M.; Lima,Renato P. de; Pedrosa,Elvira M. R.; Tavares,Uilka E.; Simões Neto,Djalma E..
ABSTRACT Compressive soil properties are typically used for the understanding of compaction process. As an alternative to laboratory tests, pedo-transfer functions have been used to estimate the mechanical behaviour of soil as a function of soil physical parameters. The impact of soil bulk density (BD) and gravimetric water content (w) was examined on soil strength and pedo-transfer functions were proposed to predict the precompression stress (σp) in an Ultisol cultivated with sugarcane. Undisturbed soil cores were sampled at the depths of 0-0.20 and 0.20-0.40 m, subjected to different water contents, and subsequently, compression tests were performed to determine σp. The data were subjected to analysis of variance and regression analysis. Bulk density and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Soil compressibility; Coastal tablelands.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000500336
Imagem não selecionada

Imprime registro no formato completo
Evaluation of corn planter under travel speed, working depth, pressure wheel and cone index CIGR Journal
Khodaei, Mehdi.
Compaction is one of the restricting factors in desirable seed germination and root growth. As a sign for soil compaction can be a criterion for optimal seed germination. Seeds require some compression of the surrounding soil at planting for optimum growth, which it is made by pressure wheels in planters. Travel speed and working depth affect the soil cone index. A field experiments were conducted to evaluate the effects of the speed and working depth in the beginning of the autumn season. Experiments were performed in the form of factorial split-plot based on a randomized complete block design with two factors, the travel speed (3, 4, and 6 km/h) and working depth (3, 6, 9, 12 and 15 cm) in three replication. Digital cone Penetrometer was used for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Cone index; Corn planter; Depth; Moving speed; Pressure wheel.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3364
Imagem não selecionada

Imprime registro no formato completo
Field Performance of a Winged Scarifier as a Function of Soil Compaction and Water Content Chilean J. Agric. Res.
Cholaky,Carmen; Cisneros,José M; Balbuena,Roberto.
Initial soil conditions, operational aspects, and tool shape affect the efficiency of soil decompaction. The objective of this study was to evaluate the performance of a winged scarifier as a function of soil compaction and edaphic water content. The experiment was carried out in a typical Hapludoll. Treatments considered two soil compaction levels: high (HC) and low compaction (LC); and three soil water contents: wet (WS), humid (HS), and dry (DS) with 9, 14, and 19% gravimetric water content, respectively. A split-plot randomized block design was applied. Tractive effort, disturbed area, tillage depth, specific resistance, and power were evaluated. Results showed that tractive effort was 17% greater in HC than LC, and in both cases HS was greater than WS...
Tipo: Journal article Palavras-chave: Agricultural engineering; Winged scarifier; Bulk density; Water content; Compaction.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100016
Imagem não selecionada

Imprime registro no formato completo
GPS receivers for georeferencing of spatial variability of soil attributes REA
Rosalen,David L; Rodrigues,Marcos S; Chioderoli,Carlos A; Brandão,Flavia J. C; Siqueira,Diego S.
The characterization of the spatial variability of soil attributes is essential to support agricultural practices in a sustainable manner. The use of geostatistics to characterize spatial variability of these attributes, such as soil resistance to penetration (RP) and gravimetric soil moisture (GM) is now usual practice in precision agriculture. The result of geostatistical analysis is dependent on the sample density and other factors according to the georeferencing methodology used. Thus, this study aimed to compare two methods of georeferencing to characterize the spatial variability of RP and GM as well as the spatial correlation of these variables. Sampling grid of 60 points spaced 20 m was used. For RP measurements, an electronic penetrometer was used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Precision agriculture; GNSS; Compaction; Soil water content.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600013
Imagem não selecionada

Imprime registro no formato completo
Implications of the variability in soil penetration resistance for statistical analysis Rev. Bras. Ciênc. Solo
Gubiani,Paulo Ivonir; Reichert,José Miguel; Reinert,Dalvan José; Gelain,Neiva Somavilla.
Soil penetration resistance (PR) is a measure of soil compaction closely related to soil structure and plant growth. However, the variability in PR hampers the statistical analyses. This study aimed to evaluate the variability of soil PR on the efficiency of parametric and nonparametric analyses in indentifying significant effects of soil compaction and to classify the coefficient of variation of PR into low, medium, high and very high. On six dates, the PR of a typical dystrophic Red Ultisol under continuous no-tillage for 16 years was measured. Three tillage and/or traffic conditions were established with the application of: (i) no chiseling or additional traffic, (ii) additional compaction, and (iii) chiseling. On each date, the nineteen PR data...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compaction; Coefficient of variation; Normality.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500003
Imagem não selecionada

Imprime registro no formato completo
Influence of compaction of a forest soil on the soil fauna in a subtropical region: I. Oribatei (Acari, Cryptostigmata) and Collembola (Insecta) Zoologia
Ushiwata,Cláudio T; Sautter,Klaus Dieter; Kobiyama,Masato.
An experiment to observe some changes of composition and population of Oribatei and Collembola was carried out on a Cambicsoil covered with Pinus taeda L. (Pinaceae). This study area is located on the Canguiri Experimental Station Center, Universidade Federal do Paraná, 20km north to Curitiba city, Brazil. The climate of the area is subtropical. The observations resulted in a conclusion that the compaction strongly changes the structure of edaphic mesofauna community as the consequence of the modification of physical properties of soils.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oribatei; Collembola; Compaction; Subtropical region.
Ano: 1995 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000400018
Imagem não selecionada

Imprime registro no formato completo
Interpretation of the stiffness and permeability of Sand-Kaolin mixtures in the framework of homogenization Anais da ABC (AABC)
Boutin,Claude; Kacprzak,Gregory; Doanh,Thiep.
This study deals with the behaviour of mixtures of sand and saturated kaolin paste considered as composite materials made of permeable and deformable (with non-linear behaviour) matrix (the kaolin paste) with rigid and impervious inclusions (the sand grains). Oedometric and permeability tests conducted on such mixtures highlight the key role of the state of the clay paste, and show the existence of a threshold of sand grain concentration above which a structuring effect influences both modulus and permeability. At the light of these experiments, the usual and tangent homogenization process (with simplifying assumptions to make the problem manageable) has been applied to estimate the mixture permeability and tangent compressibility. Qualitative and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Homogenization; Non-linear behaviour; Sand-clay mixtures; Permeability; Tangent modulus; Compaction; Hardening.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000100017
Imagem não selecionada

Imprime registro no formato completo
Iron bands, fragipans and duripans in the Northeastern plateaus of Brazil: properties and genesis. Repositório Alice
BOULET, R.; FRITSCH, E.; FILIZOLA, H. F.; ARAUJO FILHO, J. C.; LEPRUN, J. C.; BARRETO, F.; BALAN, E.; TESSIER, D..
Iron bands, fragipans and duripans are common in yellow low-activity clay soils developed from the Barreiras Group in coastal plateaus of northeastern Brazil. Such indurated horizons are found in depressions of the plateaus where sugar cane growth is greatly reduced. Little research has being done on the nature of their bonding agents and their genesis. Research carried out in arid zones has frequently attributed duripan consistency to amorphous silica; however, duripans in northeast Brazil occur under higher rainfall (1500-2000 mm). The objective of this work was to study the nature and distribution of soil features in a plateau to better understand the processes associated with soil hardening. Two transects, across a small and a large depression, were...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Utisols; Clay soil; Compaction; Soil depression; Quality; Productivity; Soil morphology.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/13041
Registros recuperados: 40
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional