Consulta: subjectFacets:"Soil compaction"
Registros recuperados: 74
Data/hora: 02/06/2024 16:30:47

SPATIAL VARIABILITY OF SOIL RESISTANCE TO PENETRATION IN NO TILLAGE SYSTEM
Provedor de dados: 70
Autores: Cortez,Jorge W.; Matos,Wéliton P. da S.; Arcoverde,Sálvio N. S.; Cavassini,Victor H.; Valente,Igor Q. M.
ABSTRACT In areas of no tillage system where there is intense traffic of machines and minimal soil mobilization, the periodic monitoring allied on localized soil compaction represent important strategies aiming agricultural sustainability. Thus, the objective of this study was to evaluate the spatial variability of soil resistance to penetration (RP) in no tillage system. Data collection took place in an experimental area of 7.65 ha using a sample grid composed of 40 points. At each point the RP was determined by three replications from which was obtained the mean RP, the maximum RP, and the depth of the maximum RP in the 0-0.40m layer. Deformed samples were randomly collected in the area to determine the water content in the soil (θ). Then the RP data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Agricultural mechanization; Geostatistics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500697

Development of an automated bench top electronic penetrometer
Provedor de dados: 70
Autores: Bianchini,Aloísio; Roque,Márcio W.; Rosa,Rodrigo P.
The aim of this study was to develop a an automated bench top electronic penetrometer (ABEP) that allows performing tests with high rate of data acquisition (up to 19,600 Hz) and with variation of the displacement velocity and of the base area of cone penetration. The mechanical components of the ABEP are: a supporting structure, stepper motor, velocity reducer, double nut ball screw and six penetration probes. The electronic components of ABEP are: a "driver" to control rotation and displacement, power supply, three load cells, two software programs for running and storing data, and a data acquisition module. This penetrometer presented in compact size, portable and in 32 validation tests it proved easy to operate, and showed high resolution, high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Soil resistance to penetration; Velocity test; Cone index.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600012

SOYBEAN AGRONOMIC PERFORMANCE AND SOIL PHYSICAL ATTRIBUTES UNDER TRACTOR TRAFFIC INTENSITIES
Provedor de dados: 70
Autores: Arcoverde,Sálvio N. S.; Souza,Cristiano M. A. de; Rafull,Leidy Z. L.; Cortez,Jorge W.; Orlando,Roberto C.
ABSTRACT Machinery traffic intensification has been recurrent in intensive agriculture in annual crops, which may lead to structural soil degradation and, consequently, a reduction of its productive capacity. Therefore, this study aimed to assess the influence of tractor traffic intensification on soil physical attributes and soybean yield components. The study was performed in an Oxisol under no-tillage for 10 years, using a randomized block design with five tractor traffic intensities (0, 2, 4, 6, 8, and 12 passes) and five replications. Density, porosity, macroporosity, microporosity, and penetration resistance were assessed in the soil and stem diameter, number of pods per plant, number of grains per pod, grain weight per plant, thousand-grain weight,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Yield components; Shoot; Soil penetration resistance; Machinery traffic.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100113

THE USE OF ARTIFICIAL INTELLIGENCE FOR ESTIMATING SOIL RESISTANCE TO PENETRATION
Provedor de dados: 70
Autores: Pereira,Tonismar dos S.; Robaina,Adroaldo D.; Peiter,Marcia X.; Torres,Rogerio R.; Bruning,Jhosefe.
ABSTRACT The aim of this study was to present and to evaluate methodologies for the estimation of soil resistance to penetration (RP) using artificial intelligence prediction techniques. In order to do so, a data base with values of physical-water characteristics of the soils available in the literature was used, and the performances of Artificial Neural Networks (ANN) and Support Vector Machines (SVM) were evaluated. The models generated from the ANNs were implemented through the multilayer perceptron with backpropagation algorithm of Matlab software, varying the number of neurons in the input and intermediate layers. For the procedure from SVM, the RapidMiner software was used, varying input variables, the kernel function and the coefficients of these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Machine learning; Support vector machines; Artificial neural networks.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100142

CHANGES IN PHYSICAL QUALITY OF OXISOLS UNDER DIFFERENT MANAGEMENT SYSTEMS IN THE BRAZILIAN CERRADO
Provedor de dados: 70
Autores: 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

Hydrographic and hydrogeological basin of Entre-Ribeiros: probable recharge zone delimitation and environmental impact assessment
Provedor de dados: 70
Autores: Vasconcelos,Vitor V.; Martins Junior,Paulo P.; Hadad,Renato M.
The probable recharge zone delimitation of Entre-Ribeiros Basin (Northwest of the state of Minas Gerais / Brazil) is proposed in this study. The delimitation is based upon stratigraphy, geomorphology, geo-environmental domains and hydrogeology studies. Combining the recharge zone map with the land use variation between 1975 and 2008, the occupation trends of possible recharge zones are identified. Concluding, the environmental impacts for this basin are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrogeology; Aquifer recharge; Land use zoning; Environment; Soil compaction.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000300015

Variations on the expertise of two attributes of physical soil due to differences in the method of global satellite navigation
Provedor de dados: 70
Autores: CRISTIANO,ZERBATO; COMPAGNON,ARIEL M.; VOLTARELLI,MURILO A.; ROSALEN,DAVID L.; FURLANI,CARLOS E. A.
ABSTRACT The mechanical resistance to penetration when related to the water content is an indicator often used of soil compaction, the use of positioning methods for greater accuracy of this review is important. In this context, this study aimed to determine the variability of positioning methods provided by GPS receivers to determine the spatial behavior of physical attributes related to soil compaction. The study area is located in the municipality of Jaboticabal, around the latitude 21º15’22”S and longitude 48º18’58”W, being characterized with a clayey Oxisol. The variables used as parameters of soil physical properties were the mechanical resistance to penetration and water content, using a sampling grid of 20 x 20 m, totaling 60 points. We used six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: GPS; Penetrometer; Soil compaction; Soil water content.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400696

Prototype for soil mechanical resistance measurement with chisel plow automated control
Provedor de dados: 70
Autores: MACHADO,THIAGO M.; LANÇAS,KLÉBER P.
ABSTRACT In Brazil, there are several available models and systems to measure soil compaction; however, the data generated by such equipment have to be processed and interpreted, making the process expensive. Our study aimed to evaluate a prototype of instrumented rods to identify soil compacted layers and control chiseling depth, and compared it to a conventional system at a fixed depth of 0.35 m. In order to compare them, we assessed the following parameters: hourly fuel consumption, operational fuel consumption, drawbar power, average power, average speed, slipping, tractor effective field capacity and response time. Our results showed that mechanical chiseling at variable depths reduced in 26% the operational fuel consumption and increased in 14% the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Soil compaction; Chiseling.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400646

Modeling and correction of soil penetration resistance for variations in soil moisture and soil bulk density
Provedor de dados: 70
Autores: Silva,Wininton M. da; Bianchini,Aloísio; Cunha,Cesar A. da.
ABSTRACT This study aimed to describe the behavior of models for adjusting data of soil penetration resistance for variations in soil moisture and soil bulk density. The study was carried out in Lucas do Rio Verde, MT, Brazil in a typic dystrophic red-yellow Latosol (Oxisol) containing 0.366 kg kg−1 of clay. Soil penetration resistance measurements were conducted in the soil moistures of 0.33 kg kg−1, 0.28 kg kg−1, 0.25 kg kg−1 and 0.22 kg kg−1. Soil penetration resistance behavior due to variations in soil moisture and soil bulk density was assessed by estimating the soil resistance values by non-linear models. There was an increase of the soil penetration resistance values as soil was losing moisture. For the same edaphic condition studied, small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Pedotransfer functions; Cone index.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000300449

RESISTANCE OF A RED LATOSOL TO PENETRATION: COMPARISON OF PENETROMETERS, MODEL ADJUSTMENT, AND SOIL WATER CONTENT CORRECTION
Provedor de dados: 70
Autores: Duarte,Thiago F.; Silva,Tonny J. A. da; Bonfim-Silva,Edna M.; Fenner,Willian.
ABSTRACT Penetration resistance can be determined directly in the field or in the laboratory. However, data obtained using the two methods are not directly comparable. Considering soil moisture influences penetration resistance, penetration resistance data obtained using the two methods can be corrected based on common moisture values. To enable comparison of the data, the measured data should be adjusted using mathematical models. Consequently, the objective of the present study was to compare soil penetration resistance values measured in a Red Latosol using a static penetrometer and a bench-top electronic penetrometer. The comparison was carried out using samples collected from different soil layers, based on moisture levels ranging from 0.15 to 0.28 kg...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physics; Soil mechanical; Soil compaction; Modeling.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400462

Use of penetrometers in agriculture: a review
Provedor de dados: 70
Autores: Moraes,Moacir T. de; Silva,Vanderlei R. da; Zwirtes,Anderson L.; Carlesso,Reimar.
Soil physical quality can be easily and quickly evaluated by using simple equipment to identify levels of soil compaction. Hence, it is necessary to know the variables responsible for changes in the soil penetration resistance (SPR). The aim of this review is to identify the main factors related to the various equipment used for assessing SPR as a soil physical quality indicator in agriculture. This literature review describes the different types of equipment used and its relationship with SPR. A wide range of procedures, devices, and equipments are available. Much of variability in SPR results is related to the equipment model, cone angle and diameter, and penetration rate. Usually, restrictions to root growth are correlated with SPR values above 2-3 MPa....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Soil physics; Physical quality; Penetrometry.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100019

Spatial variability of mechanical resistance to penetration evaluated with mobile unit on haplic vertisol cultivated with mango
Provedor de dados: 70
Autores: Cortez,Jorge W.; Lopes,Hélio L.; Coelho,Daniela S.; Arcoverde,Sálvio N. S.
Since the advent of mechanized farming and intensive use of agricultural machinery and implements on the properties, the soil began to receive greater load of machinery traffic, which can cause increased soil compaction. The aim of this study was to evaluate the spatial variability of soil mechanical resistance to penetration (RP) in the layers of 0.00-0.10, 0.10-0.20, 0.20-0.30 and 0.30-0.40m, using geostatistics in an area cultivated with mango in Haplic Vertisol of the northeastern semi-arid, with mobile unit equipped with electronic penetrometer. The RP data was collected in 56 points from an area of 3 ha, and random soil samples were collected to determine the soil moisture and texture. For RP data analysis we used descriptive statistics and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Machinery traffic; Agricultural mechanization.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000200006

Oxisol resistence to penetration in no-till system after sowing
Provedor de dados: 70
Autores: 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

Soil penetration resistance in a rhodic eutrudox affected by machinery traffic and soil water content
Provedor de dados: 70
Autores: Moraes,Moacir T. de; Debiasi,Henrique; Franchini,Julio C.; Silva,Vanderlei R. da.
Soil compaction caused by machinery traffic reduces crop yields. This study aimed to evaluate the effects of intensive traffic, and the soil water content, on the soil penetration resistance (PR) of a Rhodic Eutrudox (Distroferric Red Latosol, Brazilian Classification), managed under no-tillage (NT). The experiment consisted of six treatments: NT with recent chiseling, NT without additional compaction, and NT with additional compaction by 4, 8, 10 and 20 passes of a harvester with a weight of 100 kN (70 kN on the front axle). Undisturbed soil samples were collected at 5.5-10.5 cm and 13.5-18.5 cm depth to quantify the soil bulk density (BD). The PR was assessed in four periods, using an impact penetrometer, inserted in the soil to a depth of 46 cm. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil layers with mechanical impedance; No-tillage; Soil compaction; Soil consistency; Soil profile.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400014

Sistema plantio direto de cana-de-açúcar no Cerrado.
Provedor de dados: 14
Autores: SANTOS JUNIOR, J. de D. G. dos; SA, M. A. C. de; OLIVEIRA, C. M. de; FRANZ, C. A. B.; REIN, T. A.; SOUSA, D. M. G. de.
bitstream/item/131276/1/cirtec-30.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Goiás; Cana-de-açúcar; Agroenergia; Brasil; Savanna; No-tillage system; Stalk yield.; Plantio direto; Produtividade; Colheita mecânica; Compactação do solo; Cerrado; Saccharum Officinarum.; Brazil; Bioenergy; Soil compaction; Sugarcane.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026353

Avaliação da compactação dos solos nos campos dos cerrados.
Provedor de dados: 14
Autores: SHIOYA, T.; FOLLE, S. M.
bitstream/item/192046/1/ID09933-CRI1816.pdf
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Brasil; Japão; BIBJICACPAC.; Cerrado; Compactação do Solo; Cooperação Internacional; Pesquisa; Soil compaction.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/552991

Crescimento de raízes de soja MG/BR "Conquista" em latossolo submetido a níveis de compactação (2009).
Provedor de dados: 14
Autores: BRAGA, L. M.; FONTES, A. O.; SA, M. A. C. de; SANTOS JUNIOR, J. de D. G. dos.
bitstream/item/78136/1/p2009-029.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Compactação do Solo; Glycine Max; Soja.; Soil compaction; Soybeans; Varieties.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/737048

Camadas de impedimento mecanico do solo em sistemas agricolas com a soja.
Provedor de dados: 14
Autores: TORRES, E.; SARAIVA, O. F.
Impedimento mecanico do solo e desenvolvimento do sistema radicular; Resistencia do solo a penetracao: raizes x penetrometros; Propriedades fisicas do solo e producao das culturas; Avaliacao e monitoramento da compactacao do solo; Manejo da compatacao do solo no plantio direto.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Compactacao; Densidade; Semeadura direta; Brasil; Parana; Soil chemicophysical properties; Soybean; Zero tillage; Sowing direct.; Física do Solo; Manejo do Solo; Soja; Solo.; Brazil; Density; Soil management.; Soil compaction.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/461800

Escarificação do solo em soqueiras de cana-de-açúcar.
Provedor de dados: 14
Autores: SA, M. A. C. de; SANTOS JUNIOR, J. de D. G. dos; FRANZ, C. A. B.; REIN, T. A.
bitstream/item/131269/1/cirtec-28.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Goias; Cana-de-açúcar; Escarificação do solo; Preparo do solo; Agroenergia; Brasil; Soil tillage; Soil bulk density; Agricultural machinery; Soil scarification; Savanna.; Cerrado; Compactação do Solo; Maquina Agrícola; Produtividade; Saccharum Officinarum.; Brazil; Bioenergy; Sugarcane.; Soil compaction.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026342

Práticas de cultivo e rotação de culturas para avaliar a qualidade do solo em diferentes sistemas de manejo no Sudoeste dos Cerrados.
Provedor de dados: 14
Autores: ARAUJO, A. R. de; MACEDO, M. C. M.; FERREIRA, A. D.; BONO, J. A. M.; COSTA, F. P.; ZIMMER, A. H.; KICHEL, A. N.
O crescimento da população mundial, o aumento da expectativa de vida e a tendência à padronização do consumo têm aumentado indiscriminadamente a utilização dos recursos naturais. O desenfreado consumo dos recursos do planeta compromete a qualidade de vida e gera consequências nas gerações futuras. Neste sentido, Lopes et al. (2003) mostram tecnologias já disponíveis no Brasil para incrementos em produtividade. Tais pesquisadores procuram demonstrar, que o uso de tecnologias sustentáveis, para incrementar a produção agropecuária brasileira consiste em forte instrumento de preservação ambiental, diminuindo ou até mesmo eliminando o desmatamento desenfreado, muitas vezes de áreas com restrições ao processo intensivo de exploração.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Compactação do Solo; Fertilidade do Solo; Plantio Direto; Rotação de Cultura; Transferência de Tecnologia; Soil compaction; Soil fertility; Technology transfer.
Ano: 2018
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1094100

A compactacao dos solos pode ser controlada.
Provedor de dados: 14
Autores: SARAIVA, O. F.; TORRES, E.
Diagnostico da camada compactada; Controle; Manutencao.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Compactação do solo; Soil compaction.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445144

農用タイヤ下の6方向応力の測定と解析に関する研究
Provedor de dados: 19
Autores: 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

Application of Anaerobically Digested Dairy Slurry: effectiveness of perforated injector disk
Provedor de dados: 19
Autores: Kishimoto, Tadashi; Tani, Masayuki; Umetsu, Kazutaka; Nishizaki, Kunio; 岸本, 正; 谷, 昌幸; 梅津, 一孝; 西崎, 邦夫.
2004年8月5日とかちプラザで開催､日本ユネスコ国内委員会主催の帯広農村開発教育国際セミナー(OASERD)国際連合ユネスコアジア太平洋地域教育開発計画事業(APEID)シンポジウム「地球にやさしい農業をめざして : 家畜ふん尿，資源としての有効利用」講演資料
Palavras-chave: Spreader; Injector; Motion resistance; Resistance; Soil compaction; Biogas plant.
Ano: 2004
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1902

トラクタタイヤ接地面積の3次元計測に関する研究
Provedor de dados: 19
Autores: 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

Corn crop performance in an Ultisol compacted by tractor traffic
Provedor de dados: 86
Autores: 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

Spatial variability of soil physical attributes in integrated production systems in the Amazon region
Provedor de dados: 86
Autores: Feitosa,Izabela de Lima; Passos,Alexandre Martins Abdão dos; Cipriani,Henrique Nery; Oliveira,Marcelo Silva de; Marcolan,Alaerto Luiz; Vasques,Gustavo Mattos.
Abstract: The objective of this work was to analyze the spatial variability of soil physical attributes in integrated production systems and its relationship with the growth and yield of a corn (Zea mays) crop intercropped with palisade grass (Urochloa brizantha). The experiment was carried out in an integrated crop-livestock (ICL) system and in an integrated crop-livestock-forestry (ICLF) system, in a Plinthic Hapludox. The ICLF system was managed in alleys between eucalyptus (Eucalyptus spp.) rows, spaced at 18, 30, and 42 m. Corn grain and forage yields were positively correlated with soil clay and moisture contents, whereas grain yield was negatively correlated with soil penetration resistance. The lowest corn plant heights and grain yields were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus; Urochloa brizantha; Agronomic efficiency; Precision agriculture; Soil compaction; Soil variability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000100600

Prediction of soil shear strength in agricultural and natural environments of the Brazilian Cerrado
Provedor de dados: 86
Autores: Silva,Reginaldo Barboza da; Dias Junior,Moacir de Souza; Iori,Piero; Silva,Francisca Alcivânia de Melo; Folle,Sergio Mauro; Franz,Claudio Alberto Bento; Souza,Zigomar Menezes de.
The objective of this work was to develop uni- and multivariate models to predict maximum soil shear strength (τmax) under different normal stresses (σn), water contents (U), and soil managements. The study was carried out in a Rhodic Haplustox under Cerrado (control area) and under no-tillage and conventional tillage systems. Undisturbed soil samples were taken in the 0.00-0.05 m layer and subjected to increasing U and σn, in shear strength tests. The uni- and multivariate models - respectively τmax=10(a+bU) and τmax=10(a+bU+cσn) - were significant in all three soil management systems evaluated and they satisfactorily explain the relationship between U, σn, and τmax. The soil under Cerrado has the highest shear strength (τ) estimated with the univariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cohesion limits; Machine-ground interaction; Mechanical resistance; Precompression stress; Soil compaction; Soil physical quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000100082

Soil physical and biological properties in an integrated crop-livestock system in the Brazilian Cerrado
Provedor de dados: 86
Autores: Bonetti,João de Andrade; Paulino,Helder Barbosa; Souza,Edicarlos Damacena de; Carneiro,Marco Aurélio Carbone; Caetano,Jeander Oliveira.
Abstract: The objective of this work was to evaluate the soil physical and biological properties in an integrated crop-livestock system (ICLS), with or without cattle grazing, in different seasons. The experiment was carried out in the Cerrado biome, in Brazil, in a Rhodic Eutrudox. The treatments consisted of grazing areas (Urochloa ruziziensis) at 0.25, 0.35, and 0.45 m heights (with soybean cultivation after grazing) and of nongrazed areas. The ICLS had no negative effects on soil bulk density, total porosity, macroporosity, and microporosity. After ICLS implementation, the values of soil bulk density decreased, and those of soil macroporosity increased, in the grazed and nongrazed areas. However, after three years, bulk density and macroporosity were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal traffic; No-tillage system; Soil aggregation; Soil compaction; Soil microbial biomass; Soil quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001101239

Arbuscular mycorrhizal fungi on the biomass and nutrition of Urochloa decumbens at different soil densities
Provedor de dados: 86
Autores: 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

Thermo-physical-hydraulic variables in a no-tillage system related to wheeled traffic and furrow-opening mechanisms
Provedor de dados: 86
Autores: Zulpo,Lucas; Kerpen,Hyran Stefanowski; Fink,Jefferson Antonio; Mazurana,Michael; Levien,Renato.
Abstract: The objective of this work was to evaluate the impact of different furrow-opening mechanisms on soil physical characteristics, such as mobilization, porosity, bulk density, and the dynamics of water content and temperature in the sowing groove, as well as the influence of wheeled traffic and of these variables on corn (Zea mays) productivity. The experiment was conducted at the agronomic experimental station of Universidade Federal do Rio Grande do Sul on a Argissolo Vermelho (red Ultisol). Treatments consisted of three winter cover crops and of two types of furrow-opening mechanisms for fertilization (shank and disk), with or without tractor traffic. Corn was planted as the summer crop, and soil mobilization in the sowing groove, soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; No-tillage system; Furrow-opening mechanisms; Soil compaction; Soil temperature.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000103804

Duration of the effects of scarification and raised bed associated with vegetation cover on soybean yield on an Alfisol
Provedor de dados: 86
Autores: Fin,Silvana Spaniol; Marchesan,Enio; Gubiani,Paulo Ivonir; Farenzena,João Alberto Pedroso; Murari,Marcos Stefanello; Coelho,Lucas Lopes; Cargnelutti Filho,Alberto; Aramburu,Bruno Behenck.
Abstract: The objective of this work was to determine the duration of the effects of the mechanical interventions scarification and raised bed on soybean (Glycine max) grain yield on an Alfisol, as well as to evaluate, through physical indicators, if the use of cover plants during winter increases the duration of these effects. The experimental design was a complete randomized block with four replicates. Two factors were evaluated. The first consisted of types of soil preparation systems: SC14, scarification in November 2014; SC15, scarification in November 2015; RB14, raised bed built in November 2014; and RB15, raised bed built in November 2015. The second consisted of the type of cover crop used: winter fallow, oat, ryegrass, and wheat. From November...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Crop rotation; Rice areas; Soil compaction; Soil preparation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001101230

Compressibility of Oxisol aggregates under no-till in response to soil water potential
Provedor de dados: 90
Autores: Tavares Filho,João; Tessier,Daniel.
The system of no-till sowing stands out as being a technology that suits the objectives of more rational use of the soil and greater protection against the erosion. However, through till, any of it, occurs modifications of the soil's structure. This current work aims to study the influence of the energy state of the water and of the organic matter on the mechanism of compaction of Red Oxisol under no-till management system. Humid and non-deformed sample were collected in horizon AP of two agricultural areas under no-till, with and without rotation of cultures. In the laboratory, these samples were broken into fragments and sifted to obtain aggregates of 4 to 5 mm sized, which were placed in equilibrium under four matrix potentials. Thereafter, they were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Edometric assay; Void index; Total porosity; Soil compression; Soil compaction.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600002

Aeration condition of a clayey oxisol under long-term no-tillage
Provedor de dados: 90
Autores: 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

Physical quality of a yellow latossol under integrated crop-livestock system
Provedor de dados: 90
Autores: Araújo,Fernando Silva; Salviano,Adeodato Ari Cavalcante; Leite,Luiz Fernando Carvalho; Souza,Zigomar Menezes de; Sousa,Allan Charlles Mendes de.
Soil physical quality is essential to global sustainability of agroecosystems, once it is related to processes that are essential to agricultural crop development. This study aimed to evaluate physical attributes of a Yellow Latossol under different management systems in the savanna area in the state of Piaui. This study was developed in Uruçuí southwest of the state of Piauí. Three systems of soil management were studied: an area under conventional tillage (CT) with disk plowi and heavy harrow and soybean crop; an area under no-tillage with soybean-maize rotation and millet as cover crop (NT + M); two areas under Integrated Crop-Livestock System, with five-month pasture grazing and soybean cultivation and then continuous pasture grazing (ICL + S and ICL +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-tillage system; Soil compaction; Animal trampling; Pasture grazing.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300013

RECOVERY OF AN OXISOL DEGRADED BY THE CONSTRUCTION OF A HYDROELECTRIC POWER PLANT
Provedor de dados: 90
Autores: Carvalho,Joseane Carina Borges de; Espindola,Carlos Roberto; Alves,Marlene Cristina; Figueiredo,Getulio Coutinho; Dechen,Sonia Carmela Falci.
ABSTRACT The removal of thick layers of soil under native scrubland (Cerrado) on the right bank of the Paraná River in Selvíria (State of Mato Grosso do Sul, Brazil) for construction of the Ilha Solteira Hydroelectric Power Plant caused environmental damage, affecting the revegetation process of the stripped soil. Over the years, various kinds of land use and management systems have been tried, and the aim of this study was to assess the effects of these attempts to restore the structural quality of the soil. The experiment was conducted considering five treatments and thirty replications. The following treatments were applied: stripped soil without anthropic intervention and total absence of plant cover; stripped soil treated with sewage sludge and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregate stability; Soil compaction; Stripped soil; Soil quality.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000601776

Assessment of the soil compaction of two ultisols caused by logging operations
Provedor de dados: 90
Autores: 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

Pedotransfer functions to estimate proctor test parameters under different tillage systems
Provedor de dados: 90
Autores: Álvarez,Carina Rosa; Micucci,Federico Guillermo; Bustingorri,Carolina; Taboada,Miguel Angel.
The Proctor test is time-consuming and requires sampling of several kilograms of soil. Proctor test parameters were predicted in Mollisols, Entisols and Vertisols of the Pampean region of Argentina under different management systems. They were estimated from a minimum number of readily available soil properties (soil texture, total organic C) and management (training data set; n = 73). The results were used to generate a soil compaction susceptibility model, which was subsequently validated using a second group of independent data (test data set; n = 24). Soil maximum bulk density was estimated as follows: Maximum bulk density (Mg m-3) = 1.4756 - 0.00599 total organic C (g kg-1) + 0.0000275 sand (g kg-1) + 0.0539 management. Management was equal to 0 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic carbon; Soil compaction; Soil texture.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600002

MODELING OF SOIL LOAD-BEARING CAPACITY AS A FUNCTION OF SOIL MECHANICAL RESISTANCE TO PENETRATION
Provedor de dados: 90
Autores: Ortigara,Cícero; Moraes,Moacir Tuzzin de; Debiasi,Henrique; Silva,Vanderlei Rodrigues da; Franchini,Julio Cezar; Luz,Felipe Bonini da.
Estimation of soil load-bearing capacity from mathematical models that relate preconsolidation pressure (σp) to mechanical resistance to penetration (PR) and gravimetric soil water content (U) is important for defining strategies to prevent compaction of agricultural soils. Our objective was therefore to model the σp and compression index (CI) according to the PR (with an impact penetrometer in the field and a static penetrometer inserted at a constant rate in the laboratory) and U in a Rhodic Eutrudox. The experiment consisted of six treatments: no-tillage system (NT); NT with chiseling; and NT with additional compaction by combine traffic (passing 4, 8, 10, and 20 times). Soil bulk density, total porosity, PR (in field and laboratory measurements), U,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodic Eutrudox; No-tillage system; Machinery traffic; Soil compaction.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401036

Physical Properties and Crop Management for Corn in an Albaqualf
Provedor de dados: 90
Autores: Giacomeli,Robson; Marchesan,Enio; Oliveira,Maurício Limberger de; Martin,Thomas Newton; Teló,Gustavo Mack; Donato,Gabriel; Silva,Marília Ferreira da.
ABSTRACT Rice monoculture in lowlands can cause problems for management practices in crop fields, for example, in weed control. For this reason, corn in rotation with irrigated rice in lowlands may be advantageous, despite problems with soil compaction and water excess. The objective of this study was to evaluate soil physical properties and corn performance in soil management systems in an Albaqualf soil (lowlands). Two experiments were conducted in the field, in the 2013/14 and 2014/15 crop seasons. The experimental design was randomized blocks with two factors. There were three levels for the first factor, consisting of soil management practices: soil chiseling 45 days before sowing to a depth of 0.3 m; conventional tillage with two diskings to a depth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Soil compaction; Soil chiseling; No-till; Raised seedbed.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100408

Improvement of a testing apparatus for dynamometry: procedures for penetrometry and influence of strain rate to quantify the tensile strength of soil aggregates
Provedor de dados: 90
Autores: Figueiredo,Getulio Coutinho; Silva,Alvaro Pires da; Tormena,Cássio Antonio; Giarola,Neyde Fabíola Balarezo; Moraes,Sergio Oliveira; Almeida,Brivaldo Gomes de.
Soil penetration resistance (PR) and the tensile strength of aggregates (TS) are commonly used to characterize the physical and structural conditions of agricultural soils. This study aimed to assess the functionality of a dynamometry apparatus by linear speed and position control automation of its mobile base to measure PR and TS. The proposed equipment was used for PR measurement in undisturbed samples of a clayey "Nitossolo Vermelho eutroférrico" (Kandiudalfic Eutrudox) under rubber trees sampled in two positions (within and between rows). These samples were also used to measure the volumetric soil water content and bulk density, and determine the soil resistance to penetration curve (SRPC). The TS was measured in a sandy loam "Latossolo Vermelho...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Soil physical quality; Tensile stress; Soil penetration resistance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000200008

Soil water retention and s index after crop rotation and chiseling
Provedor de dados: 90
Autores: 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

Correction of resistance to penetration by pedofunctions and a reference soil water content
Provedor de dados: 90
Autores: 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

Temporary effect of chiseling on the compaction of a Rhodic Hapludox under no-tillage
Provedor de dados: 90
Autores: Silva,Sâmala Glícia Carneiro; Silva,Álvaro Pires da; Giarola,Neyde Fabíola Balarezo; Tormena,Cássio Antônio; Sá,João Carlos de Moraes.
Mechanical chiseling has been used to alleviate the effects of compaction in soils under no-tillage (NT). However, its effect on the soil physical properties does not seem to have a defined duration period. The purpose of this study was to evaluate the behavior of the bulk density (BD) and degree of compaction (DC) at different soil depths, after chiseling in no-tillage, for one year. The experiment was performed in Ponta Grossa, Paraná State, Brazil, using an Oxisol (Rhodic Hapludox). Bulk density and DC were previously measured in an area under NT for 16 years, then immediately after chiseling (CHI) in May 2009, six months after chiseling (CHI6M) in October 2009 and one year after chiseling (CHI12M) in May 2010. In the layers 0.0-0.10, 0.10-0.20 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Structure; Soil quality; Resilience.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200024

Least limiting water range in soil under crop rotations and chiseling
Provedor de dados: 90
Autores: Calonego,Juliano Carlos; Rosolem,Ciro Antonio.
Soil water availability to plants is affected by soil compaction and other variables. The Least Limiting Water Range (LLWR) comprises soil physical variables affecting root growth and soil water availability, and can be managed by either mechanical or biological methods. There is evidence that effects of crop rotations could last longer than chiseling, so the objective of this study was to assess the effect of soil chiseling or growing cover crops under no-till (NT) on the LLWR. Crop rotations involving triticale (X Triticosecale) and sunflower (Helianthus annuus) in the fall-winter associated with millet (Pennisetum glaucum), sorghum (Sorghum bicolor) and sunn hemp (Crotalaria juncea) as cover crops preceding soybean (Glycine max) were repeated for three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cover crops; Crop rotation; Soil compaction; No till; Soil water.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300012

Comparison of Methods for Determining Precompression Stress Based on Computational Simulation
Provedor de dados: 90
Autores: 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

Soil shear strength under non-irrigated and irrigated short duration grazing systems
Provedor de dados: 90
Autores: 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

Root abundance of maize in conventionally-tilled and zero-tilled soils of Argentina
Provedor de dados: 90
Autores: Taboada,Miguel Angel; Alvarez,Carina Rosa.
Maize root growth is negatively affected by compacted layers in the surface (e.g. agricultural traffic) and subsoil layers (e.g. claypans). Both kinds of soil mechanical impedances often coexist in maize fields, but the combined effects on root growth have seldom been studied. Soil physical properties and maize root abundance were determined in three different soils of the Rolling Pampa of Argentina, in conventionally-tilled (CT) and zero-tilled (ZT) fields cultivated with maize. In the soil with a light Bt horizon (loamy Typic Argiudoll, Chivilcoy site), induced plough pans were detected in CT plots at a depth of 0-0.12 m through significant increases in bulk density (1.15 to 1.27 Mg m-3) and cone (tip angle of 60 º) penetrometer resistance (7.18 to 9.37...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zero tillage; Conventional tillage; Soil compaction; Root growth.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200031

Pine Harvest Impact on Soil Structure of a Dystric Cambisol (Humic)
Provedor de dados: 90
Autores: Costa,Adriano da; Albuquerque,Jackson Adriano; Costa,André da; Warmling,Maria Tereza; Magro,Bruno Afonso.
ABSTRACT Traffic of heavy machinery at harvest and log extraction causes structural degradation of the soil, but studies on the effects of forest harvesting on soils with high organic matter content and exchangeable Al are scarce. The objective of this study was to evaluate the effect of mechanized forest harvesting operations on a Dystric Cambisol (Humic) with high organic matter (more 50 g kg1) content and exchangeable Al (more 6,0 cmolc kg-1), reforested with Pinus taeda L. The evaluated harvesting system were the whole-tree, in which the feller-buncher cuts and lays the trees down in bundles; the skidder drags the tree bundles up near a road; and the harvester delimbs and cuts the trees into short logs, stacking them on the roadside to be loaded onto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Mechanized harvesting; Traffic; Soil physical properties.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100410

Deep subsoiling of a subsurface-compacted typical hapludult under citrus orchard
Provedor de dados: 90
Autores: Medeiros,João Carlos; Figueiredo,Getulio Coutinho; Mafra,Álvaro Luiz; Rosa,Jaqueline Dalla; Yoon,Sung Won.
Soil management practices which increase the root depth penetration of citrus are important to the longevity and yield maintenance of this plant, especially in regions where long periods of drought are common, even in soil conventionally subsoiled to a depth of 30-40 cm, when the orchard was first established. The objective of this study was to evaluate the efficiency of subsoiling on the physical and hydric properties of a Typical Hapludult and fruit yield in a 14-year-old citrus orchard located in Piracicaba, SP. The treatments consisted of: no-subsoiling (with no tilling of the soil after the orchard was planted); subsoiling on one side of the plant lines (SUB. 1); and subsoiling on both sides of the plant lines (SUB. 2). The subsoiling treatments were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Soil management; Soil physics; Subsoiler.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400008

Effects of traffic control on the soil physical quality and the cultivation of sugarcane
Provedor de dados: 90
Autores: Souza,Gustavo Soares de; Souza,Zigomar Menezes de; Silva,Reginaldo Barboza da; Barbosa,Ronny Sobreira; Araújo,Fernando Silva.
The cultivation of sugarcane with intensive use of machinery, especially for harvest, induces soil compaction, affecting the crop development. The control of agricultural traffic is an alternative of management in the sector, with a view to preserve the soil physical quality, resulting in increased sugarcane root growth, productivity and technological quality. The objective of this study was to evaluate the physical quality of an Oxisol with and without control traffic and the resulting effects on sugarcane root development, productivity and technological quality. The following managements were tested: no traffic control (NTC), traffic control consisting of an adjustment of the track width of the tractor and sugarcane trailer (TC1) and traffic control...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural mechanization; Soil compaction; Root system; Technological variables; Saccharum sp.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100013

Spatial patterns of preconsolidation pressure and soil moisture along transects in two directions under coffee
Provedor de dados: 90
Autores: Gontijo,Ivoney; Souza Dias Junior,Moacir de; Guimarães,Paulo Tácito Gontijo; Oliveira,Marcelo Silva de; Ajayi,Ayodele Ebenezer.
Information on the spatial structure of soil physical and structural properties is needed to evaluate the soil quality. The purpose of this study was to investigate the spatial behavior of preconsolidation pressure and soil moisture in six transects, three selected along and three across coffee rows, at three different sites under different tillage management systems. The study was carried out on a farm, in Patrocinio, state of Minas Gerais, in the Southeast of Brazil (18 º 59 ' 15 '' S; 46 º 56 ' 47 '' W; 934 m asl). The soil type is a typic dystrophic Red Latosol (Acrustox) and consists of 780 g kg-1 clay; 110 g kg-1 silt and 110 g kg-1 sand, with an average slope of 3 %. Undisturbed soil cores were sampled at a depth of 0.10-0.13 m, at three different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semivariogram; Soil compaction; Geostatistics; Soil sampling.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400012

Structural changes in latosols of the cerrado region: I - relationships between soil physical properties and least limiting water range
Provedor de dados: 90
Autores: Severiano,Eduardo da Costa; Oliveira,Geraldo César de; Dias Júnior,Moacir de Souza; Costa,Katia Aparecida de Pinho; Silva,Fabiano Guimarães; Ferreira Filho,Silvio Marcos.
The agricultural potential of Latosols of the Brazilian Cerrado region is high, but when intensively cultivated under inappropriate management systems, the porosity can be seriously reduced, leading to rapid soil degradation. Consequently, accelerated erosion and sedimentation of springs and creeks have been observed. Therefore, the objective of this study was to evaluate structural changes of Latosols in Rio Verde, Goiás, based on the Least Limiting Water Range (LLWR), and relationships between LLWR and other physical properties. Soil samples were collected from the B horizons of five oxidic Latosols representing the textural variability of the Latosols of the Cerrado biome. LLWR and other soil physical properties were determined at various soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Degradation of agricultural soils; Soil penetration resistance; Water availability; Soil texture.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300013

COMPRESSIBLITY AND PENETRABILITY OF LATOSSOLO VERMELHO-AMARELO DISTRÓFICO (OXISOL) UNDER VARIED MANAGEMENT SYSTEMS AND LAND USES
Provedor de dados: 90
Autores: 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

X-ray computed microtomography in the evaluation of the porous system of soils
Provedor de dados: 91
Autores: Costa,Larissa F.; Balbinot Antonino,Antonio C. D.; Richard J.,Heck; Coutinho,Artur P.; Vasconcelos,Thiago C.; Machado,Cassia B.
ABSTRACT Analysis of shapes, sizes, continuity, orientation and irregularities of pores can help in the study of soil structural modifications induced by soil management. The study of the inter- and intra-aggregate porous space of urban and rural soils by tomographic images is the objective of this work. A morphometric characterization of the pores was carried out with the analysis of distribution of their size, shape and inclination in these two types of soil. The urban soil showed smaller percentage of inter-aggregate voids and more intra-aggregate voids compared with the rural soil. The cumulative distribution of void volumes showed little pore diversity in the urban soil and great presence of large pores (48%), almost twice the voids with same size in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porosity; Tomographic images; Soil compaction.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400249

Least limiting water range in Spodosol and initial growth of sugarcane under soil bulk densities and salinities
Provedor de dados: 91
Autores: Bezerra,Raphaela R.; Silva,Ênio F. de F. e; Siqueira,Glécio M.; Dantas,Daniel da C.; Almeida,Brivaldo G. de; Silva,Alexsandro O. da.
ABSTRACT The impacts of agricultural mechanization and soil management on sugarcane activity may compromise the growth of plants. This study aimed to evaluate the initial growth of sugarcane (Saccharum officinarum) at soil densities under two salinity conditions, associated with the least limiting water range (LLWR), and obtain the critical density for the Spodosol. The treatments consisted of the use of five bulk densities (1.40; 1.50; 1.60; 1.70 and 1.80 Mg m-3) and two conditions of soil salinity (ECse = 0.5 and 3.0 dS m-1). Morphological variables and biomass of sugarcane plants were measured and, simultaneously, undisturbed soil samples were collected in the layers of 0.02-0.08 m to determine the water retention curve, soil resistance to penetration...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum officinarum; Soil compaction; Soil resistance to root penetration; Soil physical quality.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001100833

Soil resistance to penetration in cotton rows and interrows
Provedor de dados: 91
Autores: Baio,Fábio H. R.; Scarpin,Igor M.; Roque,Cassiano G.; Neves,Danilo C.
ABSTRACT The soil physical quality is one of the most determinant factors for the development of any crop. This study aimed to assess the sample representativeness in soil resistance to penetration mappings taken in rows and interrows of the cotton crop, under two soil moisture conditions. Thirty control points were sampled in a cotton field of 91 ha. Soil resistance to penetration and soil moisture were measured at these georeferenced points. Regardless of soil moisture, the sampling position of soil resistance to penetration is indifferent (row, interrow, or in both positions) when the analysed depth is greater than 0.20 m in the cotton crop. The decrease of soil moisture causes the increment of soil resistance to penetration, regardless of the sampling...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cone index; Penetrometer; Soil compaction.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000600433

Bulk density and water tensions in the soil on corn root production
Provedor de dados: 91
Autores: 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

Soil physical attributes in integrated bean and sheep system under nitrogen levels
Provedor de dados: 124
Autores: Andreolla,Veruschka Rocha Medeiros; Moraes,Aníbal de; Bonini,Andreia Kusumota; Deiss,Leonardo; Sandini,Itacir Eloi.
Integrated crop-livestock systems (ICLS) can promote higher grain and meat/milk yield as well as reduce soil degradation risks. Thus, this study aimed to evaluate the influence of grazing sheep with moderate intensity and nitrogen doses on soil physical attributes, and bean crop yield (Phaseolus vulgaris Lam.) under rotation with summer corn crop (Zea mays Lam.) and winter pasture with oats (Avena sativa Lam) and ryegrass (Lolium multiflorum Lam.) The experimental design was completely randomized blocks with split-plot; the plots were nitrogen doses and the split-plots were grazing presence or absence. The treatments were nitrogen doses of 0, 75, 150 and 225 kg ha-1 applied on ryegrass and white oat pasture in winter followed by bean crop. Soil density,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Integrated crop-livestock system; Soil compaction; Yield.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000500008

Chiseling and gypsum application affecting soil physical attributes, root growth and soybean yield
Provedor de dados: 124
Autores: 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

Assessment of soil physical attributes at sowing row and inter-row under no-till system
Provedor de dados: 124
Autores: 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

Least limiting water range and physical quality of soil under groundcover management systems in citrus
Provedor de dados: 63
Autores: Fidalski,Jonez; Tormena,Cássio Antonio; Silva,Álvaro Pires da.
Machinery-based farming operations used for perennial fruit crops often damage soils, particularly if the soil is wet and prone to compaction. We hypothesized that perennial vegetation growing in the interrows of orange orchards can mitigate the soil physical degradation from machinery traffic. The objective of this study was to investigate the effects of different groundcover management systems on the soil physical quality indicators including the least limiting water range (LLWR). An experiment was started in 1993 in a Typic Paleudult to evaluate three groundcover management systems: Bahia grass (Paspalum notatum) with mowing, perennial peanut (Arachis pintoi), and natural regrowth in which weeds were controlled by herbicide. The experimental design was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Soil compaction; Bulk density; Resistance to penetration; Available water.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400012

Soil bulk density and biomass partitioning of Brachiaria decumbens in a silvopastoral system
Provedor de dados: 63
Autores: 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

Least limiting water range, S-index and compressibility of a Udalf under different management systems
Provedor de dados: 63
Autores: Lima,Cláudia Liane Rodrigues de; Dupont,Patrícia Bianca; Pillon,Clenio Nailto; Miola,Ezequiel Cesar Carvalho.
ABSTRACT: Agricultural areas in the region of Turuçu, on the Southeast Hillside in the state of Rio Grande do Sul (RS), Brazil present many examples of soil physical degradation. Accordingly, strategies aimed at evaluating and ameliorating the structural quality of soils should be developed to ensure the sustainable use of these areas. This study aimed to evaluate the least limiting water range (LLWR), S-index, compressibility parameters, organic carbon and the organic matter granulometric fractions of a Udalf under different agricultural uses. Soil samples with disturbed and non-disturbed structure from the 0.00 to 0.10 m layer were collected on farms in the Southeast Hillside, Turuçu region, RS, for analyzing soil under: i) conventional system of corn...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil quality; Soil physics; Soil structure; Soil compaction.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100100

Changes in soil chemical and physical properties in pasture fertilised with liquid swine manure
Provedor de dados: 63
Autores: 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

Controlled traffic and soil physical quality of an Oxisol under sugarcane cultivation
Provedor de dados: 63
Autores: Souza,Gustavo Soares de; Souza,Zigomar Menezes de; Cooper,Miguel; Tormena,Cássio Antônio.
Machinery traffic in sugarcane (Saccharumsp.) plantations reduces soil physical quality, and hinders both root development and crop yield. We evaluated the physical quality of an Oxisol and the development of sugarcane roots under controlled traffic. The treatments assessed were: without controlled machinery traffic (WCT), controlled traffic by adjusting the tractor and infield wagons to a 3.0 m track width with the operator guiding the machinery (CT1) and the previous treatment using real time kinematic / global positioning system (RTK / GPS) precision auto steer (CT2). Soil samples were collected from the planting rows, seedbed and inter-row center to determine the least limiting water range (LLWR) and soil porosity from scanned 2-D images. The root dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Least limiting water range; Soil compaction; Machinery traffic; Root system.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300270

Least limiting water range for oil palm production in Amazon region, Brazil
Provedor de dados: 63
Autores: Sato,Michel Keisuke; Lima,Herdjania Veras de; Ferreira,Raphael Leone da Cruz; Rodrigues,Sueli; Silva,Álvaro Pires da.
ABSTRACT In areas cultivated with oil palm, typically mechanized field operations using heavy vehicles may negatively affect soil physical properties and productivity. The aim of this study was to evaluate soil physical quality in an area cultivated with oil palm by monitoring the temporal variation of the soil water content and relating it to the critical limits of the least limiting water range. Soil bulk density (Bd), soil penetration resistance (SR), least limiting water range (LLWR), and water stress days (WSD) were used to assess soil physical quality in planting rows (PR) and the traffic zone (TZ) at depths 0-20, 20-40, and 40-60 cm. The Bd was higher and the LLWR was reduced in TZ only at the surface layer. The effect of temporal variation in soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elaeis guineensis Jacq; Soil physical quality; Soil compaction; Water stress.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200148

Soil penetration resistance mapping quality: effect of the number of subsamples
Provedor de dados: 1
Autores: Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio.
There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability. soil compaction; Sampling protocol; Precision agriculture; Microvariability Física do solo.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989

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

Soil penetration resistance mapping quality: effect of the number of subsamples
Provedor de dados: 1
Autores: Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio.
There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability.; Soil compaction; Sampling protocol; Precision agriculture; Microvariability; Física do solo.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989

Calibration and study of soil physical-hydric relations using a frequency domain reflectometry probe
Provedor de dados: 111
Autores: Duarte, Thiago; Silva, Tonny José Araújo da; Bonfim-Silva, Edna Maria; Souza, Hanna Pricilla Barbosa.
The FDR Diviner 2000® probe is widely used to monitor soil moisture and to study physical-hidric relationships. The calibration equation provided by the manufacturer may not correctly reproduce the actual moisture value for the same type of soil with different bulk densities. In addition, it was postulated in this experiment that the capacitance probe can be used to determine the soil water tension and the initial soil water retention curve. Thus, the objectives were: to assess whether the calibration equation parameters of the FDR probe changes with the bulk density variation; estimate the soil water tension using the FDR probe; and verify the effect of the probe calibration in determining the initial soil water retention curve for the Red Oxisol at three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physics; Soil moisture; Soil compaction; Instrumentation; Diviner 2000®.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6673

Spatial variability of soil penetration resistance influenced by season of sampling
Provedor de dados: 53
Autores: 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

Soil structural quality degradation by the increase in grazing intensity in integrated crop-livestock system
Provedor de dados: 53
Autores: Auler,André Carlos; Galetto,Shivelly Los; Hennipman,Fabrício Siqueira; Guntzel,Eduardo Daniel; Giarola,Neyde Fabíola; Fonseca,Adriel Ferreira da.
ABSTRACT The intensification of soil use, as in integrated croplivestock system (ICLS), might promote soil structural degradation. A field method to evaluate the soil structural quality is the Visual Evaluation of Soil Structure (VESS). Studies on the application of this method to ICLS are few. This work aimed to evaluate the structural quality of a Dystrudept under ICLS and different grazing intensities through VESS. Thus, the soil structure was evaluated in light grazing (LG) and heavy grazing (HG) in comparison to a neighboring native forest (NF) as reference area. After the grazing period, 10 trenches were dug in each area to collect soil monoliths. The identification of structural differences and the attribution of visual scores were carried out...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattle trampling; Soil compaction; Visual Evaluation of Soil Structure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400550

Load-bearing capacity of a red-yellow latosol cultivated with coffee plants subjected to different weed managements
Provedor de dados: 64
Autores: Pais,Paula Sant'Anna Moreira; Dias Junior,Moacir de Souza; Dias,Adriana Cristina; Iori,Piero; Guimarães,Paulo Tácito Gontijo; Santos,Gislene Aparecida dos.
It is essential to know the levels of pressure applied to the soil by different weed managements to adapt the management of coffee plantations in a sustainable manner. The objectives of this study were: a) to generate load-bearing capacity models of a Red-Yellow Latosol (Oxisol) submitted to different weed managements and b) to determine which weed management resulted in higher compression. The study was conducted at the Experimental Farm of EPAMIG, located near the community Farias, in Lavras-MG (latitude 21° 14' 43" S and longitude 44° 59' 59" W and altitude of 919 m). The soil is a Red-Yellow Latosol (LVA) cultivated with coffee plantation using Topazio MG 1190 coffee variety, since 2006. We evaluated five weed managements, three being through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee culture; Soil compaction; Sustainability; Preconsolidation stress; Soil structure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000200005

Management zones determination based on physical properties of the soil
Provedor de dados: 64
Autores: Varón-Ramírez,Viviana Marcela; Camacho-Tamayo,Jesús Hernán; González-Nivia,Janeth.
ABSTRACT The physical characteristics of the soil are defined through the interaction between its properties, and they, in turn, can indicate its physical quality. The study area is located in the Centro Agropecuário Marengo (Marengo Agricultural Center), with an extension of 94.5 ha, subdivided into 17 plots. The objective of this research was to study characteristics such as water storage capacity, structure, consistency, and soil compaction in the two surface horizons (H1 and H2), in order to define management zones through the soil index. Properties such as soil penetration resistance were an indicator of soil degradation, with values higher than 2 MPa in 13 plots. The total porosity exhibited medium or low values in the H1 and H2 horizons, with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil degradation; Soil compaction; Soil water storage; Soil index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000300248