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| 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 |
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| Mazurana,Michael; Levien,Renato; Müller,Jônatan; Conte,Osmar. |
| The introduction and intensification of no-tillage systems in Brazilian agriculture in recent decades have created a new scenario, increasing concerns about soil physical properties. The objective of this study was to assess the effects of different tillage systems on some physical properties of an Ultisol previously under native grassland. Five tillage methods were tested: no-tillage (NT), chiseling (Ch), no-tillage with chiseling every two years (NTCh2), chiseling using an equipment with a clod-breaking roller (ChR) and chiseling followed by disking (ChD). The bulk density, macroporosity, microporosity and total porosity, mechanical resistance to penetration, water infiltration into the soil and crop yields were evaluated. The values of soil bulk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil bulk density; Soil resistance to penetration; Soil porosity. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400013 |
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| Grego,Célia Regina; Vieira,Sidney Rosa; Xavier,Mauro Alexandre. |
| Tests to evaluate competition between plants, in general do not consider the soil spatial variability, nevertheless, the uniformity rarely is present and can not be assumed without verification. The aim of this work was to apply geostatistics to verify the spatial variability of the soil in an experimental field near Ribeirão Preto, SP, with sugarcane variety IACSP93-3046. Ninety seven geo-referenced samples, placed at distances of 10 m, were collected for soil chemical analysis, soil resistance to penetration and biometric evaluation of the sugar cane plant included number of tillers, stalk diameter, stalk height, estimated productivity (TSSe) and root density. Geostatistics has been applied by means of semivariogram, data interpolation via kriging and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Soil chemistry; Soil resistance to penetration; Root; Tillers. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500012 |
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| Teixeira,Rafael B.; Borges,Monica C. R. Z.; Roque,Cassiano G.; Oliveira,Marcela P.. |
| ABSTRACT Soil management alters soil physical attributes and may affect crop yield. In order to evaluate soil physical attributes in layers from 0 to 0.40 m and soybean grain yield, in the 2012/2013 agricultural year, an essay was installed in the experimental area of the Federal University of Mato Grosso do Sul (UFMS/CPCS). Soil tillage systems were: conventional tillage (CT), minimum tillage (MT) and no tillage (DS), the cover crops used were millet, sunn hemp and fallow. The experimental design was randomized blocks with split plots. For the layer of 0.20-0.30 m, millet provided the best results for soil bulk density, macro and microporosity. The resistance to penetration (RP) was influenced in the layer of 0-0.10 m, and millet provided lower RP. The DS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil resistance to penetration; Direct sowing; Soil density. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201057 |
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