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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
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Comparison of field and laboratory models of the load bearing capacity in coffee plantations Ciência e Agrotecnologia
Iori,Piero; Dias Junior,Moacir de Souza; Ajayi,Ayodele Ebenezer; Guimarães,Paulo Tácito Gontijo; Pais,Paula Sant'Anna Moreira; Andrade,Maria Luiza de Carvalho.
Precompression stress is an important property for assessment of tropical soil structure sustainability and is often determined in laboratory tests. The objective of this study was to compare the load bearing capacity models obtained with controlled moisture in laboratory and those obtained with natural field moistures determined a long one year. The evaluation of soil structural sustainability follows four distinct steps: soil sampling in the field, uniaxial compression test of the samples in the laboratory, determination of precompression stress and estimation of the load bearing capacity models. Laboratory estimates of precompression stress were obtained from moisture controlled in laboratory and from natural moisture determined in a field a long one...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural traffic; Coffea Arabica L.; Homogeneity test; Precompression stress.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000200003
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Influence of field slope and coffee plantation age on the physical properties of a red-yellow Latosol Rev. Bras. Ciênc. Solo
Iori,Piero; Dias Junior,Moacir de Souza; Ajayi,Ayodele Ebenezer; Guimarães,Paulo Tácito Gontijo; Abreu Júnior,Áureo Aparecido.
In modern agriculture, several factors cause changes in the soil physical properties. The time of establishment of a crop (plantation age) and the slope are examples of factors that moderate the impact of mechanized operations on the soil structure. The objective of this study was to analyze the effect of machinery traffic on the physical properties of a Red-Yellow Latosol under coffee plantations with different ages (2, 7, 18, and 33 years) and slope positions (3, 9 and 15 %). Samples were collected from three positions between coffee rows (lower wheel track, inter-row and upper wheel track) and at two depths (surface layer and sub-surface). Changes in the total porosity, macroporosity, microporosity, organic matter, bulk density, and aggregate stability...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural traffic; Coffea arabica L.; Soil degradation; Aggregate stability.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100010
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Soil compaction during harvest operations in five tropical soils with different textures under eucalyptus forests Ciência e Agrotecnologia
Martins,Paula Cristina Caruana; Dias Junior,Moacir de Souza; Ajayi,Ayodele Ebenezer; Takahashi,Ernesto Norio; Tassinari,Diego.
ABSTRACT Traffic of farm machinery during harvest and logging operations has been identified as the main source of soil structure degradation in forestry activity. Soil susceptibility to compaction and the amount of compaction caused by each forest harvest operation differs according to a number of factors (such as soil strength, soil texture, kind of equipment, traffic intensity, among many others), what requires the adequate assessment of soil compaction under different traffic conditions. The objectives of this study were to determine the susceptibility to compaction of five soil classes with different textures under eucalyptus forests based on their load bearing capacity models; and to determine, from these models and the precompression stresses...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Harvester; Forwarder; Feller buncher; Clambunk; Precompression stress..
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000100058
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Spatial patterns of preconsolidation pressure and soil moisture along transects in two directions under coffee Rev. Bras. Ciênc. Solo
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
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Structural sustainability of cambisol under different land use system Rev. Bras. Ciênc. Solo
Martins,Paula Cristina Caruana; Dias Junior,Moacir de Souza; Ajayi,Ayodele Ebenezer; Moreira,Fátima Maria de Souza.
Incongruous management techniques have been associated with some significant loss of agricultural land to degradation in many parts of the world. Land degradation results in the alteration of physical, chemical and biological properties of the soil, thereby posing a serious threat to sustainable agricultural development. In this study, our objective is to evaluate the changes in a Cambisol structure under six land use systems using the load bearing capacity model. Sampling was conducted in Amazonas Region, Brazil, in the following land use: a) young secondary forest; b) old secondary forest; c) forest; d) pasture; e) cropping, and f) agroforestry. To obtain the load bearing capacity models the undisturbed soil samples were collected in those land use...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Structure degradation; Bulk density; Precompression stress; Amazonas.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000600006
Registros recuperados: 6
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