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| Registros recuperados: 114 | |
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| Betioli Junior,Edner; Tormena,Cássio Antônio; Moreira,Wagner Henrique; Ball,Bruce C.; Figueiredo,Getulio Coutinho; Silva,Álvaro Pires da; Giarola,Neyde Fabíola Balarezo. |
| The hypothesis of this study was that the absence of soil tillage in long-term no-tillage (NT) systems can be detrimental to soil aeration. The objective was to assess the aeration condition of an Oxisol (Rhodic Ferrasol), very clayey texture (750 g kg-1 of clay; 200 g kg-1 of sand), after 30 years of cultivation under NT. The physical property soil air permeability (Ka) is sensitive to changes in the soil pore system. Aside from Ka, the air-filled porosity (ε a) and indices of pore continuity (K1 and N), derived from the relationship between Ka and εa, were used as indices of soil aeration. From the soil layers 0.0-0.1 and 0.1-0.2 m, 240 undisturbed samples were collected along a transect perpendicular to the crop rows, at three sampling positions: corn... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Air permeability; Air-filled porosity; Pore continuity; Sampling spatial location. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300031 |
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| DEBIASI, H.; FRANCHINI, J. C.; OLIVEIRA, F. A. de; MACHADO, T. M.. |
| O efeito da intensidade de amostragem na variabilidade espacial da resistência à penetração (RP) de um Latossolo Bruno sob sistema plantio direto foi avaliado em uma área de 18,9 ha localizada em Guarapuava/PR. A RP foi determinada em maio de 2011, por meio de um penetrômetro eletrônico, nas profundidades de 5, 10, 15, 20, 25 e 30 cm. Utilizou-se uma grade amostral de 30 × 30 m, totalizando 210 leituras de RP. Os dados foram submetidos à análise geoestatística, realizada para diferentes intensidades de amostragem, simuladas pela exclusão de pontos amostrais distribuídos uniformemente pela área. Considerando todos os 210 pontos amostrados, a RP apresentou dependência espacial em todas as profundidades avaliadas. Os modelos ajustados para os semivariogramas... |
| Tipo: Parte de livro |
Palavras-chave: Geoestatística; Agricultura de precisão; Compactação do solo; Soil compaction; Precision agriculture; Geostatistics. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/908820 |
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| Sales,Luciane Reis; Silva,Geanderson Nascimento da; Siqueira,Raphael Henrique da Silva; Carneiro,Marco Aurélio Carbone; Faquin,Valdemar. |
| Abstract: The objective of this work was to evaluate the influence of arbuscular mycorrhizal fungi (AMF) on the accumulation of shoot and root biomass and on the nutrient contents of Urochloa decumbens grown in soils with different densities. The experiment was carried out in a randomized complete block design, in a 4x2 factorial arrangement: four soil densities (1.0, 1.2, 1.4, and 1.6 kg dm-3) with and without inoculation of AMF, with four replicates. The biomass accumulation (dry matter weight of shoot and roots) and macro- and micronutrient contents of U. decumbens were determined at different soil densities. The mycorrhizal colonization of the plants was evaluated, and the number of mycorrhizal spores present in the soil was determined. The biomass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AMF; Dry matter; Macro - and micronutrients; Soil compaction. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000800943 |
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| Blum,Julius; Giarola,Neyde Fabíola Balarezo; Silva,Álvaro Pires da; Guedes Filho,Osvaldo; Silva,Sâmala Glícia Carneiro; Eberhardt,Diogo Néia; Araújo,Suzana Romeiro. |
| In no-till systems, two different soil conditions are created during the sowing operation: row and inter-row positions. The objectives of this study were to evaluate, using static and dynamic soil attributes, the influence of no-till sowing operation on creating better physical environment for soybean crop growth. A field transect with clay content ranging from 150 to 400 g kg-1 was selected in Ponta Grossa, Paraná State, Brazil, from a Typic Hapludox that has been cultivated under no-till system for 16 years. After soybean harvest, 68 undisturbed soil samples were collected at both sowing row and inter-row positions. The following soil properties were evaluated: saturated hydraulic conductivity, air permeability, bulk density, total porosity, soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil physical quality; Soil conservation tillage; Soil compaction; Air permeability; Saturated hydraulic conductivity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000500004 |
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| Dias Junior,Moacir de Souza; Silva,Sérgio Ricardo; Santos,Nadívio Souza dos; Araujo-Junior,Cezar Francisco. |
| The impact of wood loads on bulk density and preconsolidation pressure and of harvester and forwarder traffic on rut depth, bulk density and preconsolidation pressure of two Ultisols were examined in this study. Our objective was to quantify the threshold beyond which significant soil compaction and rutting would occur. This study was carried out in the county of Eunápolis, state of Bahia, Brazil, (16 º 23 ' 17 '' S and 39 º 10 ' 06 '' W; altitude 80 m asl) in two Ultisols (PAd2 and PAd3) with different texture classes, in experimental areas with eucalypt plantation. The study involved measurements at the wood load site and machine driving at specific locations in the forest during logging operations. The treatments consisted of one harvester pass and, 8,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rut depth; Soil compaction; Preconsolidation pressure; Harvest operations. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000600004 |
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| BALBINOT JUNIOR, A. A.; VEIGA, M. da; VOGT, G. A.; SPAGNOLLO, E.. |
| O objetivo deste trabalho foi avaliar, no quinto ano de experimentação, o efeito de formas de uso do solo no inverno sobre a quantidade de palha remanescente, os atributos físicos e químicos do solo e a produtividade de grãos de feijão cultivado em sucessão. Foi conduzido um experimento na região do Planalto Norte de Santa Catarina, entre maio de 2006 e abril de 2011, no qual foram avaliadas cinco formas de uso do solo no inverno, repetidas por cinco anos nas mesmas parcelas: 1) consórcio de aveia preta + azevém + ervilhaca comum manejado sem pastejo (consórcio cobertura); 2) o mesmo consórcio, com pastejo e com 100kg ha-1 de N ano-1 em cobertura (pastagem com N); 3) o mesmo consórcio, com pastejo e sem adubação nitrogenada (pastagem sem N); 4) nabo... |
| Tipo: Separatas |
Palavras-chave: Integração lavoura-pecuária; Plantio direto; Planta de cobertura; Compactação do solo; Cover crops; Soil compaction; No-tillage. |
| Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/924016 |
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| SPERA, S. T.; ESCOSTEGUY, P. A. V.; KLEIN, V. A.; DENARDIN, J. E.; SANTOS, H. P. dos. |
| Resumo. O objetivo do trabalho foi avaliar os efeitos de diferentes tipos de manejo de solo e das rotações de culturas nos atributos físicos restritivos de duas camadas de solo na produção vegetal de culturas de grãos. O experimento foi conduzido em Passo Fundo (RS), em um Latossolo Vermelho distrófico, com 22 anos de cultivo. Os tratamentos consistiram em três tipos de manejo de solo e três rotações de culturas. Foram avaliados o rendimento de grão, a massa seca da parte aérea das culturas e os atributos físicos densidade, porosidade, resistência mecânica do solo à penetração, argila dispersa em água, condutividade hidráulica do solo saturado e água disponível no solo pelo intervalo hídrico ótimo (IHO), em duas camadas de solo (0 a 6,7 e 6,8 a 15 cm). O... |
| Tipo: Artigo de periódico |
Palavras-chave: Intervalo hídrico ótimo; Resistência à penetração; Plantio direto; Latossolo vermelho; Compactação do solo; No-tillage; Soil compaction; Soil penetration resistance. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/914277 |
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| Nunes,João A. S.; Bonfim-Silva,Edna M.; Silva,Tonny J. A. da. |
| ABSTRACT Inadequate management of soil and water can cause changes in soil physical characteristics, resulting in lower root development. Thus the objective of the present study was to evaluate the dry matter production of corn roots under combinations of levels of bulk density and water tension in the soil. The experiment was conducted in a greenhouse in a randomized block design, based on a modified central composite design of a 52 fractional factorial scheme, of combinations of bulk densities (1.0, 1.2, 1.4, 1.6 and 1.8 Mg m-3) and water tensions in the soil (10, 20, 30 40 and 50 kPa), resulting in 13 treatments with four replicates. An Oxisol collected in the layer of 0-0.2 m was used. The pots were made of PVC (polyvinyl chloride) tube with compacted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Soil compaction; Soil management. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000400357 |
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| Feitosa,Carlos E. L.; Costa,Pedro H. dos S.; Meneses,Kamila C. de; Oliveira,Ulisses C. de; Farias,Maryzélia F. de. |
| ABSTRACT Soil compaction in agricultural areas has greatly increased in recent decades due to intensive farming practices, including short-cycle crops and machinery intensification. This study aimed to evaluate the impacts of management systems on the physical quality of a dystrophic Yellow Oxisol, in the Cerrado region of Brazil. Treatments consisted of five soil management systems, with five replications (native forest [control], slash-and-burn agriculture, pasture, no-tillage, and conventional tillage). Data analysis was performed using a completely randomized experimental design. All systems were analyzed for soil density, macroporosity, microporosity, total porosity, hydraulic conductivity, infiltration, water retention curve, penetration resistance,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: S index; Land cover change; Physical properties; Infiltration; Soil compaction. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000500609 |
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| Scheid,Douglas Leandro; Silva,Rodrigo Ferreira da; Silva,Vanderlei Rodrigues da; Ros,Clovis Orlando Da; Pinto,Marlo Adriano Bison; Gabriel,Márcia; Cherubin,Maurício Roberto. |
| ABSTRACT: Chemical and physical properties of soil can be altered with the successive application of liquid swine manure (LSM), also known as slurry. Therefore, monitoring the impact of LSM is essential to an assessment of the potential agronomic and environmental benefits and risks associated with management practices. The aim of this study was to evaluate the effects of LSM on the chemical and physical attributes of soil under pasture (Cynodon spp.), located in southern Brazil. Four areas were sampled: three areas cultivated with Cynodon spp. pasture with successive applications of 200 m3 ha–1 y–1 of LSM for three, eight and 15 years; and untreated native forest as a reference. The soil attributes evaluated were: organic carbon (OC), active (pH water)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Management of organic residues; Organic carbon; Nutrient availability; Soil compaction; Soil chemistry. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501401 |
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| Santos,Esmael Lopes dos; Debiasi,Henrique; Franchini,Julio Cezar; Vieira,Marcos José; Balbinot Junior,Alvadi Antonio. |
| ABSTRACT This study aimed to evaluate the effect of chiseling and gypsum application on soil physical properties, soybean root growth and grain yield. An experiment was carried out in Londrina, Paraná state, Brazil, under a randomized complete block design, with six replications. The soil in the experimental area is classified as a dystroferric Red Latosol (Oxisol), containing 720 g kg-1 of clay. The experiment comprised four treatments: (1) continuous no-tillage (CNT) system without gypsum application, (2) CNT with gypsum application at 3.5 Mg ha-1, (3) chiseled soil without gypsum, and (4) chiseled soil with gypsum application. Regardless of gypsum application, chiseling increased water infiltration rate in soil and reduced penetration resistance. Gypsum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: No-tillage; Soil penetration resistance; Infiltration rate; Soil compaction. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400536 |
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| Registros recuperados: 114 | |
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