|
|
|
| Registros recuperados: 74 | |
|
| |
|
| |
|
|
| 全, 亨奎; 谷口, 哲司; 大友, 功一; 岸本, 正; 玉利, 達人; JUN, Hyung-gyu; TANIGUCHI, Tetsuji; OHTOMO, Ko-ichi; KISHIMOTO, Tadashi; TAMARI, Tatsuto. |
| 6個の圧力センサを利用して耕盤での土中応力状態を測定可能な土中応力測定器 (以下測定器) を開発した。測定器をタイヤ進行方向のタイヤ中心部およびタイヤ側端のラグ直下ならびにタイヤ側端のアンダートレッド直下の3ヶ所に土壌表面から深さ25cmの耕盤上に埋設し, タイヤを走行させて土中応力を測定した。得られたデータから応力状態を算出し, 主応力を求めた。次に, 測定器の埋設位置の違いによる最大主応力を検討した。その結果, タイヤ中心部ラグ直下における最大主応力が, タイヤ側端部でのそれの2倍以上になっていることが分かった。 A transducer was developed to determine the stress state in the soil on a hard pan. Principal stresses， octahedral normal and shearing stresses can be calculated from the data measured with six pressure cells on the transducer in the six predetermined directions. The transducer was buried in three locations in the soil at 25cm depth : under the lug at the centerline and the edge of the tire and under the undertread at the edge of the tire. The effect of changes in the locations of buried transducer... |
|
Palavras-chave: 土壌踏圧; 動荷重; 空気圧; 土中応力; 応力テンソル; 農用タイヤ; ラジアルタイヤ; Soil compaction; Dynamic load; Inflation pressure; Soil stress; Stress tensor; Agricultural tractor tire; Radial tire. |
| Ano: 1997 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2950 |
| |
|
|
| 全, 亨奎; 谷口, 哲司; 大友, 功一; 岸本, 正; 大山, 毅; JUN, Hyung-gyu; TANIGUCHI, Tetsuji; OHTOMO, Ko-ichi; KISHIMOTO, Tadashi; OHYAMA, Tsuyoshi. |
| タイヤ性能を改善し土壌踏圧を解明するための基礎研究として, タイヤ変形を考慮しての接地面積計測方法を確立した。走行時のタイヤ断面形状を楕円で近似し, タイヤのラジアル方向および横方向変形量, 沈下量, 踏面長さ等の測定値から, タイヤ走行時の3次元接地面積を求めた。また, レーザセンサ距離計により土壌面上部定位置から踏圧面までの距離をメッシュ状に測定できる土壌変形計測装置を開発し, タイヤ静荷重時の3次元接地面積を求めた。これより, 静荷重時接地面積は走行時の約1.3倍となった。さらに, 同装置により静荷重時の土壌深さの違いによる土壌変形量を測定した。その結果, 変形前の土壌の10cmより浅い土壌層にラグによる土壌変形がみられた。 Methods for the determination of 3-D contact area between a tire and soil were presented to improve tire performance and to clarify soil compaction. The contact area during tire operation on the soil was calculated with radial，lateral and longitudinal deflections of the tire and the sinkage. The device with a laser sensor was developed to measure the distances from a fixed position to soil surface for the calculation of contact area under... |
|
Palavras-chave: タイヤ変形; 土壌踏圧; 接地面積; 土壌変形; 空気圧; トラクタタイヤ; ラジアルタイヤ; Tire deformation; Soil compaction; Contact area; Soil deformation; Inflation pressure; Agricultural tractor. |
| Ano: 1997 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2952 |
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
| |
|
| |
|
|
| 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 |
| |
|
| |
|
| |
|
|
| Carvalho,Rita de Cássia Ribeiro; Rocha,Wellington Willian; Pinto,José Cardoso; Pires,Bruno da Silva; Dias Junior,Moacir de Souza; Nunes,Ayeska Hubner Braga. |
| Pasture productivity can drop due to soil compaction caused by animal trampling. Physical and mechanical alterations are therefore extremely important indicators for pasture management. The objective of this research was to: draw and evaluate the Mohr failure line of a Red Yellow Latossol under different pasture cycles and natural forest; calculate apparent cohesion; observe possible physical alterations in this soil; and propose a correction factor for stocking rates based on shear strength properties. This study was conducted between March/2006 and March/2007 on the Experimental Farm of Fundação de Ensino Superior de Passos, in Passos, state of Minas Gerais. The total study area covered 6 ha, of which 2 ha were irrigated pasture, 2 ha non-irrigated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Pasture; Animal trampling. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300004 |
| |
|
| |
|
|
| Paciullo,Domingos Sávio Campos; Castro,Carlos Renato Tavares de; Gomide,Carlos Augusto de Miranda; Fernandes,Priscila Beligoli; Rocha,Wadson Sebastião Duarte da; Müller,Marcelo Dias; Rossiello,Roberto Oscar Pereyra. |
| Shade in silvopastoral systems improves the thermal comfort of animals, but it may also affect the pasture productivity and can contribute to soil compaction in the shaded areas due to the increase in the number of animals looking for comfort. The effect of grazing at various distances from tree rows (under the tree canopy, at 6 and at 12 m away from the trees) on the soil bulk density and on the aerial and root biomass of Brachiaria decumbens was evaluated in both the dry and the rainy seasons. The study was carried out on an Orthic Ferralsol in a randomized block design with two replications. Tree rows were composed of Eucalyptus grandis and Acacia mangium species, and the paddocks were submitted to a rotational stocking management, using Holstein (Bos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forage mass; Root mass; Soil compaction; Shading; Shoot/root ratio. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000500014 |
| |
|
|
| Bonnin,Juan José; Mirás-Avalos,José Manuel; Lanças,Kléber Pereira; González,Antonio Paz; Vieira,Sidney Rosa. |
| The aim of this work was to analyze the spatial distribution of soil compaction and the influence of soil water content on the resistance to penetration. The latter variable was described by the cone index. The soil at the study site was a Nitisol and the cone index data were obtained using a penetrometer. Soil resistance was assessed at 5 different depths, i.e. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and deeper than 40 cm, whereas soil water content was measured at 0-20 cm and 20-40 cm. Soil water conditions varied during the different samplings. Coefficients of variation for cone index ranged from 16.5% to 45.8% while those for soil water content varied from 8.96% to 21.38%. Results suggested a high correlation between soil resistance, as assessed by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cone index; Indicator kriging; Soil compaction; Spatial distribution. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500017 |
| |
|
|
| Ros,Vinicius de V; Souza,Cristiano M. A. de; Vitorino,Antonio C. T; Rafull,Leidy Z. L. |
| If inappropriately conducted, management and sowing practices may compromise the environment and the profitability of the agricultural activity. The aim of this study was to analyze the furrow opener mechanisms action and the level of load applied to soil firming mechanism in no-till, on the Oxisol resistance to penetration during soybean sowing, under three soil moistures. The experiment was arranged in split-split plot design, in which the plots were composed by three soil moistures (23.8; 25.5 and 27.5% b.s.), two furrow opener mechanisms sub-plots (double disks and furrow plough) and the split-split plot of three levels of load applied to soil firming mechanism (12.2; 18.5 and 24.1 kPa), according to randomized blocks design, with three replications.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Furrow opener mechanism; Soil firming mechanism; Soil compaction. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000600008 |
| |
|
| |
|
|
| Calonego,Juliano Carlos; Rosolem,Ciro Antonio. |
| Soil compaction can be minimized either mechanically or biologically, using plant species with vigorous root systems. An experiment was carried out with soybean (Glycine max) in rotation with triticale (X Triticosecale) and sunflower (Helianthus annuus) in fall-winter associated with pearl millet (Pennisetum glaucum), grain sorghum (Sorghum bicolor) or sunn hemp (Crotalaria juncea) in spring. Crop rotation under no-till was compared with mechanical chiseling. The experiment was carried out in Botucatu, São Paulo State, Brazil. Soil quality was estimated using the S index and soil water retention curves (in the layers of 0-0.05, 0.075-0.125, 0.15-0.20, 0.275-0.325, and 0.475-0.525 m deep). Crop rotation and chiseling improved soil quality, increasing the S... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cropping systems; Soil compaction; Tillage; Soil quality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600009 |
| |
| Registros recuperados: 74 | |
|
|
|
