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| Registros recuperados: 74 | |
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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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| 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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| 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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| Silva,Anderson Rodrigo da; Lima,Renato Paiva de. |
| ABSTRACT There are many methods for determining precompression stress (σp), whose value is affected by the slope of the soil compression curve. This study was designed to evaluate the hypothesis that for a certain compression curve all methods used to determine σp present the same value and accuracy. The aim of this study was to compare the accuracy and the relationship among seven of these methods by computational simulation of soil compression curves under nine scenarios. The following methods were used: Casagrande, Pacheco Silva, intersection of the initial void ratio with the virgin compression line (VCLzero), and the regression methods based on 2 (reg1), 3 (reg2), 4 (reg3), and 5 (reg4) points for modeling the elastic curve. Under each scenario,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil stress; Soil compression curve; Soil compaction. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100413 |
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| Neiva Júnior,Eudes; Rocha,Wellington Willian; Pires,Bruno Silva; Farnezi,Múcio Mágno de Melo; Dias Junior,Moacir de Souza; Freitas,Danilo Fernandes Borges de; Silva,Enilson de Barros; Carvalho,Gianniini Alexsandra de Oliveira. |
| Soil compaction is one of the main degradation causes, provoked by inappropriate agricultural practices that override the limitations of the soil physical properties. Preconsolidation pressure and penetration resistance have proved effective as alternative to assess and identify soil compaction. Based on the interpretation of these physico-mechanical parameters, compaction can be prevented with a better adjusted soil management. This study was performed to generate preconsolidation pressure and penetration resistance models for Latososlo Vermelho-Amarelo distrófico (Oxisol) under various managements and uses; and evaluate which of these would lead to degradation or degradation susceptibility. The study was carried out in Curvelo, MG. Two managements and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Sheep grazing; No-tillage system; Atlantic rainforest. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100086 |
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| Moraes,Moacir Tuzzin de; Levien,Renato; Trein,Carlos Ricardo; Bonetti,João de Andrade; Debiasi,Henrique. |
| Abstract: The objective of this work was to determine whether compaction by tractor traffic in areas managed under controlled traffic can be limiting to corn crop, under different tillage systems, in a Typic Paleudult of medium texture. Two experiments were carried out, one in the field over two crop seasons and another in a greenhouse. The treatments consisted of minimum tillage with chiselling; no-tillage subjected to one, three, or six passes of a tractor weighing 3.8 Mg; and an area without traffic. Evaluations were performed for soil physico-hydraulic parameters (soil bulk density, penetration resistance, and water retention curve), root and shoot growth, and grain yield. The agricultural traffic increased bulk density, soil penetration resistance,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Grain yield; No-tillage; Root growth; Soil compaction. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400464 |
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| Moraes,Moacir Tuzzin de; Debiasi,Henrique; Franchini,Julio Cezar; Silva,Vanderlei Rodrigues da. |
| The soil penetration resistance is an important indicator of soil compaction and is strongly influenced by soil water content. The objective of this study was to develop mathematical models to normalize soil penetration resistance (SPR), using a reference value of gravimetric soil water content (U). For this purpose, SPR was determined with an impact penetrometer, in an experiment on a Dystroferric Red Latossol (Rhodic Eutrudox), at six levels of soil compaction, induced by mechanical chiseling and additional compaction by the traffic of a harvester (four, eight, 10, and 20 passes); in addition to a control treatment under no-tillage, without chiseling or additional compaction. To broaden the range of U values, SPR was evaluated in different periods.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pedotransfer functions; Oxisol; Impact penetrometer; Soil compaction. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000600004 |
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| Registros recuperados: 74 | |
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