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	Provedor de dados Rev. Bras. Ciênc. Solo (3) CIGR Journal (2) Scientia Agricola (2) Chilean J. Agric. Res. (1) BABT (1) Bragantia (1) Neotropical Entomology (1) AGRIAMBI (1) Rev. Bras. Frutic. (1) Mais... Autor Beutler,Amauri Nelson (2) Centurion,José Frederico (2) Ajayi,Ayodele Ebenezer (1) Aladenola,Olanike Olaiya (1) Araujo Junior,Cezar Francisco (1) Assmann,Tangriani S. (1) Balocchi,Oscar (1) Bassegio,Doglas (1) Brum,Betania (1) Camargo,Livia Arantes (1) Centurion,Maria Aparecida Pessoa da Cruz (1) Curi,Nilton (1) DALBÓ,MARCO ANTÔNIO (1) DAMBRÓS,REMI NATALIN (1) Dean D. Steele; North Dakota State University (1) Dec,Dorota (1) Depieri,Rogério A (1) Dias Junior,Moacir de Souza (1) Dörner,José (1) Figueiredo,Getulio Coutinho (1) Mais... Palavra-chave Penetration resistance (13) Bulk density (4) Organic matter (2) Porosity (2) Aggregates (1) Agricultural and Biosystems Engineering (1) Agricultural and Biosystems Engineering/ Soil and Water Engineering Unit cowpea (1) Andisol (1) Carthamus tinctorius L. (1) Controlled drainage (1) Cross-semivariogram (1) Density (1) Diet (1) Dry bulk density (1) Euschistus heros (1) Fertilizer (1) Glycine max (1) Grazing pressure (1) Load support capacity (1) Machine traffic (1) Mais... Tipo do documento Info:eu-repo/semantics/article (11) Journal article (1) Ano 2018 (1) 2017 (1) 2016 (1) 2015 (1) 2013 (2) 2011 (1) 2010 (2) 2009 (1) 2007 (1) 2004 (2) Mais... País Brazil (10) China (2) Chile (1) Idioma Inglês (13)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 13 Primeira ... 1 ... Última Cowpea response to compaction and mulching on a sloping loamy sand soil in Southern Nigeria CIGR Journal Raphael, Davids Olorungbon. Mulching the surface of soil after machinery traffic can offset some of the adverse effect of compaction of the soil caused by the machine.  Thus, this study reported the response of cowpea (vigna-unguiculata) to compaction and mulching with elephant grass (Pennisectum purpuereum) on loamy sand soil in Southern Nigeria.  A randomized split-block design of field plots with compaction levels as the main block and the mulching levels as the sub-block was used.  The compaction treatment consisted of 0, 5, 10 and 15 passes of a tractor with a 31 kPa contact pressure while the mulching treatment consisted of 0%, 30%, 60% and 90% areal ground cover.  The zero percent treatment served as control and each treatment was replicated twice.  The soil dry bulk density,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural and Biosystems Engineering/ Soil and Water Engineering Unit cowpea; Tractor traffic; Mulch cover; Yield parameters; Dry bulk density; Penetration resistance. Ano: 2017 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3926 Subsurface drainage effects on soil penetration resistance and water table depth on a clay soil in the Red River of the North Valley, USA CIGR Journal Hans J. Kandel; NORTH DAKOTA STATE UNIVERSITY; Jack A. Brodshaug; North Dakota State University; Dean D. Steele; North Dakota State University; Joel K. Ransom; North Dakota State University; Tom M. DeSutter; North Dakota State University; Gary R. Sands; University of Minnesota.   Since 1993, the Red River of the North Valley in North Dakota (ND) and Minnesota (MN), in the USA has experienced increased annual rainfall which has caused localized seasonal soil waterlogging and inhibited crop yield potential in the unique, high water table clay soils of the region.  Subsurface (tile) drainage has been increasingly considered by farmers to help reduce excess water in the crop root zone.  Producers desire to manage the water table for optimizing yield and trafficability of the field.  The objective of this research was to evaluate differences in soil penetration resistance and water table depth between subsurface (drained) and non-subsurface drained treatments (undrained), using water control structures, in fallow, and cropped soybean... Palavras-chave: Agricultural and Biosystems Engineering; Plant Sciences Subsurface water management; Penetration resistance; Controlled drainage; Water table depth; Trafficability; USA. Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2145 Safflower root and shoot growth affected by soil compaction Bragantia Sarto,Marcos Vinicius Mansano; Bassegio,Doglas; Rosolem,Ciro Antonio; Sarto,Jaqueline Rocha Wobeto. ABSTRACT Safflower (Carthamus tinctorius L.) is a commercial seed crop grown for its good yield of high-quality oil. It is tolerant to water stress but may be sensitive to soil compaction. The aim of this study was to assess safflower growth under different degrees of soil compaction at depths of 0.15 m to 0.20 m. The experiment was carried out in PVC pots constructed from three rings. Five levels of penetration resistance (0.20, 0.33, 0.50, 0.93, and 1.77 MPa) were applied in the intermediate ring, and two safflower genotypes, IMA-4904 and IMA-2106, were examined. There was no difference between safflower genotypes with respect to their resistance to soil compaction, which reduced root length density in the compacted layer and changed the root... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carthamus tinctorius L.; Root length; Bulk density; Penetration resistance. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200348 Models for the estimation of the physical quality of a Yellow Red Latosol (Oxisol) under pasture BABT Ribon,Adriana Aparecida; Tavares Filho,João. Models were developed considering the physical parameters penetration resistance (RP), bulk density (Ds), gravimetric moisture (U), clay content (Ag), sand content (Ar) and organic matter (MO) collected from a Yellow Red Latosol (Oxissol) medium texture under pasture from Rondonópolis county district, Mato Grosso State. Sampling was carried out in 34 fully randomized points in a 1 ha area to the depth of 0-20cm. The models were created using the Statistical Analysis System program (SAS) through which linear multiple regressions and correlations were made. Using the determination coefficient the following model was selected: RP=-12.134+0.004MO+7.6187Ds+0.131AG (R²=0.78). The evaluation of the organic matter and the soil clay content were important tools to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Modeling; Penetration resistance; Organic matter; Texture. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100004 Temporal and spatial variability of structure dependent properties of a volcanic ash soil under pasture in southern Chile Chilean J. Agric. Res. Dec,Dorota; Dörner,José; Balocchi,Oscar. Prairies are a main source for livestock feeding in southern Chile. The aim of this research was to define how grazing events and natural wetting and drying cycles (WD) affect the spatial and temporal variability of the soil’s structural properties. The investigation was conducted in a Duric Hapludand, Valdivia Series. Penetration resistance (PR) and volumetric water content (WC), measured in situ, were used to prepare maps which show i) temporal (1383 to 3047 kPa for 46 to 16% WC) and spatial changes, and ii) grazing events as an important factor influencing spatial changes in PR (differences of 3421 kPa between max and min values). Grazing and WD cycles induced changes in the soil’s mechanical stability and pore functions, which indicate that... Tipo: Journal article Palavras-chave: Penetration resistance; Water content; Mechanical strength; Porous system; Andisol. Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200015 Aging and food source effects on mandibular stylets teeth wear of phytophagous stink bug (Heteroptera: Pentatomidae) Neotropical Entomology Depieri,Rogério A; Siqueira,Fábio; Panizzi,Antônio R. Studies were conducted to test the effect of age and food sources on wear of the mandibular teeth of the phytophagous pentatomid, Euschistus heros (F.). The total length (µm) of the area bearing the mandibular teeth, the length of the 1st tooth, and the height of the 2nd tooth for teneral (< 1 day-old) adults were significantly greater than that of adults fed on natural [green bean, Phaseolus vulgaris pods, raw shelled peanuts, Arachis hypogaea, and mature soybean, Glycine max seeds] for 30 or 60 days. Adults fed on artificial dry diet showed, in general, similar results to those of teneral adults. Force (Newtons) required penetrating the natural foods was significantly greater than that required penetrating the artificial diet. The greater hardness of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Euschistus heros; Mouthpart; Morphology; Penetration resistance; Diet. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000600017 Comparison of estimation methods of soil strength in five soils Rev. Bras. Ciênc. Solo Ajayi,Ayodele Ebenezer; Dias Junior,Moacir de Souza; Curi,Nilton; Araujo Junior,Cezar Francisco; Aladenola,Olanike Olaiya; Teixeira Souza,Thiago Tadeu; Inda Junior,Alberto Vasconcellos. In agriculture, the soil strength is used to describe the susceptibility to deformation by pressure caused by agricultural machine. The purpose of this study was to compare different methods for estimating the inherent soil strength and to identify their suitability for the evaluation of load support capacity, compaction susceptibility and root growth. The physical, chemical, mineralogical and intrinsic strength properties of seven soil samples, collected from five sampling pits at different locations in Brazil, were measured. Four clay (CS) and three sandy clay loam (SCL) soils were used. The clay soils were collected on a farm in Santo Ângelo, RS (28 º 16 ' 16 '' S; 54 º 13 ' 11 '' W 290 m); A and B horizons at the Universidade Federal de Lavras, Lavras,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Penetration resistance; Preconsolidation pressure; Load support capacity. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000300002 Portable penetrometer for agricultural soil: sensitivity test to identify critical compaction depth Rev. Bras. Ciênc. Solo Medeiros,João Carlos; Figueiredo,Getulio Coutinho; Mafra,Álvaro Luiz. To express the negative effects of soil compaction, some researchers use critical values for soil mechanical strength that severely impair plant growth. The aim of this study was to identify this critical compaction depth, to test the functionality of a new, portable penetrometer developed from a spring dynamometer, and compare it to an electronic penetrometer traditionally used in compaction studies of agricultural soils. Three soils with distinct texture were conventionally tilled using a disk plow, and cultivated with different plant species. The critical soil resistance defined to establish critical compaction depth was equal to 1.5 MPa. The results of the new equipment were similar to the electronic penetrometer, indicating its viability as a tool for... Tipo: Info:eu-repo/semantics/article Palavras-chave: Spring dynamometer; Penetration resistance. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600006 Mineralogy of the clay fraction of alfisols in two slope curvatures: IV - spatial correlation with physical properties Rev. Bras. Ciênc. Solo Camargo,Livia Arantes; Marques Júnior,José; Pereira,Gener Tadeu. Although the influence of clay mineralogy on soil physical properties has been widely studied, spatial relationships between these features in Alfisols have rarely been examined. The purpose of this work was to relate the clay minerals and physical properties of an Alfisol of sandstone origin in two slope curvatures. The crystallographic properties such as mean crystallite size (MCS) and width at half height (WHH) of hematite, goethite, kaolinite and gibbsite; contents of hematite and goethite; aluminium substitution (AS) and specific surface area (SSA) of hematite and goethite; the goethite/(goethite+hematite) and kaolinite/(kaolinite+gibbsite) ratios; and the citrate/bicarbonate/dithionite extractable Fe (Fe d) were correlated with the soil physical... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aggregates; Mineral crystallinity; Density; Porosity; Penetration resistance; Cross-semivariogram. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200002 Sampling plan for using a motorized penetrometer in soil compaction evaluation AGRIAMBI Storck,Lindolfo; Kobata,Sarha G. K.; Brum,Betania; Soares,André B.; Modolo,Alcir J.; Assmann,Tangriani S.. ABSTRACT This study aimed to estimate the size of blocks of observations of resistance to penetration, obtained by a motorized digital penetrometer, and the number of blocks with semi-amplitude of the confidence interval between 5 and 20% of the mean penetration resistance, for different soil depth ranges and cone diameters. Data were collected in two contrasting plots of a crop-livestock integration experiment, located in Abelardo Luz, SC, Brazil. Ten blocks were delimited and the resistance to penetration was determined in 20 points spaced by 20 cm, using a motorized digital soil penetrometer. To estimate the mean of resistance to penetration, 12 blocks of four points per experimental plot should be used for a semi-amplitude of the confidence interval... Tipo: Info:eu-repo/semantics/article Palavras-chave: Sample size; Penetration resistance; Grazing pressure; Soil management. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000300250 SOIL ATTRIBUTES THREE YEARS AFTER MAKING RIDGES AND OR DRAINS FOR PLANTING GRAPEVINE ROOTSTOCK Rev. Bras. Frutic. VEIGA,MILTON DA; DAMBRÓS,REMI NATALIN; DALBÓ,MARCO ANTÔNIO. RESUMO Os atributos do solo estão relacionados com o desenvolvimento e a produção das culturas, tanto anuais como perenes. O presente trabalho teve como objetivo determinar os atributos químicos e físicos do solo três anos após a aplicação de sistemas de manejo para implantação de porta-enxertos de videira, em um Nitossolo Vermelho com textura muito argilosa. Os sistemas de manejo consistiram na confecção ou não de camalhões e/ou de drenos antes da implantação das mudas de porta-enxertos Dog Ridge. Os atributos químicos (pH em água e teores de matéria orgânica e de macronutrientes) foram determinados em amostras coletadas na linha da cultura, nas camadas de 0-0,1; 0,1-0,2; 0,2-0,3 e 0,3-0,4 m de profundidade. Os atributos físicos do solo (teor de argila,... Tipo: Info:eu-repo/semantics/article Palavras-chave: PH; Organic matter; Macronutrients; Bulk density; Porosity; Penetration resistance; Vitis. Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452015000300797 Traffic soil compaction of an oxisol related to soybean development and yield Scientia Agricola Beutler,Amauri Nelson; Centurion,José Frederico; Centurion,Maria Aparecida Pessoa da Cruz; Freddi,Onã da Silva; Sousa Neto,Eurico Lucas de; Leonel,Cristian Luarte; Silva,Álvaro Pires da. Excessive traffic on the soil may affect soybean development. This research was carried out to evaluate soybean root development and grain yield under compacted soil, in an Oxisol. The following traffic treatments were used: T0 = no traffic; T1* = 1 passage of a 4 t tractor; and, T1, T2, T4 and T6, respectively for 1, 2, 4 and 6 passages of an 11 t tractor on the same location, each besides the other. After compaction, soybean [Glycine max cv. MG/BR 46 (Conquista)] was cultivated. The experiment was arranged in a completely randomized design, with six compaction levels and four replicates (plots of 9.0 m²). Undisturbed soil samples were collected in the layers 0.03-0.06, 0.08-0.11, 0.15-0.18 and 0.22-0.25 m, for physical analyses. Root analyses were... Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Machine traffic; Bulk density; Penetration resistance. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600008 Soil compaction and fertilization in soybean productivity Scientia Agricola Beutler,Amauri Nelson; Centurion,José Frederico. Soil compaction and fertilization affect soybean development. This study evaluated the effects of soil compaction and fertilization on soybean (Glycine max cv. Embrapa 48) productivity in a Typic Haplustox under field conditions in Jaboticabal, SP, Brazil. A completely randomized design with a 5 x 2 factorial layout (compaction vs. fertilization), with four replications in each treatment, was employed. Each experimental unit (replicate) consisted of a 3.6 m² useful area. After the soil was prepared by cultivation, an 11 Mg tractor passed over it a variable number of times to create five levels of compaction. Treatments were: T0= no compaction, T1= one tractor pass, T2= two, T4= four, and T6= six passes, and no fertilizer and fertilizer to give soybean... Tipo: Info:eu-repo/semantics/article Palavras-chave: Bulk density; Penetration resistance; Fertilizer; Yield. Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600010 Registros recuperados: 13 Primeira ... 1 ... Última

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