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Registros recuperados: 7
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Characterization of structural profiles in clay-rich marsh soils by cone resistance and resistivity measurements Inra
Bernard-Ubertosi, M.; Dudoignon, P.; Pons, Y..
The management of clay-rich soils in agriculture is mainly dependent on their hydromechanical properties that govern their structural evolutions. These structural evolutions are commonly described along the shrinkage curves obtained in a laboratory. Nevertheless, the field survey needs tools of in situ investigations able to characterize the structural profile evolutions of soils through the seasons. This paper presents a method based on the cone penetration and resistivity measurement by penetrometer–salinometer coupling that was gauged in the West Marsh of the French Atlantic Coast. First, the parallel measurements of water and cone resistance (Qd) profiles in clay dominant soils, characterized by very large ranges of water content (W), allows the...
Tipo: Journal Article Palavras-chave: MARAIS; SOL ARGILEUX; PROFIL STRUCTURAL; PROPRIETE HYDROMECHANIQUE; RESISTIVITE; RESISTANCE; EXPERIMENTATION IN SITU CLAY-RICH SOIL; MARSH; CONE RESISTANCE; RESISTIVITY; IN SITU INVESTIGATION; HYDROMECHANICAL PROPERTIES.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009787a0c7b&uri=/notices/prodinra1/2010/09/
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Exemple d'une production de broutards en zone de marais à partir d'un troupeau de vaches charolaises vêlant à l'automne Inra
Lafon, E.; Havet, A.; Damour, L.; Pons, Y..
Dans une grande partie des marais de l’Ouest on ne parvient pas à valoriser 1UGB/ha sur les parcelles non cultivables. Pourtant il existe des modes de conduite des vaches allaitantes qui permettent d’atteindre ce niveau de performances. A partir d’un troupeau de vaches charolaises, conduites sur marais – pâturage tournant au printemps, complémenté l’été ; ensilage d’herbe et foin l’hiver – et vêlant à l’automne, on dispose de résultats zootechniques et d’estimation de la production parcellaire de différents types de prairies. La fertilité est proche de 100 % ; la mortalité périnatale atteint 13 % et la productivité numérique 0,9 veau par vache sur 5 années. La croissance des veaux s’élève à1000 g/j entre la naissance et le sevrage en début d’été ; pendant...
Tipo: Journal Article Palavras-chave: RACE BOVINE CHAROLAISE; BROUTARD; SEVRAGE; FACTEUR SOL; VACHE ALLAITANTE.
Ano: 1988 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB8900000732012984&uri=/notices/prodinra1/2008/06/
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Shrinkage and subsidence in a marsh soil : measurements and preliminary model Inra
Bernard, M.; Dudoignon, P.; Chevallier, C.; Pons, Y..
Modeling the shrinkage and subsidence of soils is generally based on the laboratory shrinkage curves established from liquid state to shrinkage limit, rarely exhibited in situ. We studied the vertical behavior of clay-dominant soils from the Marais de l'Ouest (France) in the 20 to 100% water content range. The consolidation states were quantified by recording profiles of wet density (γb) and gravimetric water content (W) down to the depth of 2.50 and 2.00 m in a sunflower (Helianthus annuus L.) field and a grassland, respectively. Under the evident surface consolidation, a paleosol was observed at 1.3-m depth in the sunflower field. The W profiles show two superimposed layers: in the upper layer, W increased from the shrinkage limit (Ws) to the plasticity...
Tipo: Journal Article Palavras-chave: SOL; SOL ARGILEUX; AFFAISSEMENT; RETRAIT; MODELISATION; MESURE IN SITU SHRINKAGE; SUBSIDENCE; MARSH SOIL; MODELLING; IN SITU MEASUREMENTS; CLAY-DOMINANT SOIL.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008aae27d89&uri=/notices/prodinra1/2010/09/
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Soil anomaly mapping using a caesium magnetometer : limits in the low magnetic amplitude case Inra
Mathé, V.; Lévêque, F.; Mathé, P E.; Chevallier, C.; Pons, Y..
Caesium magnetometers are new tools for soil property mapping with a decimetric resolution [Mathé, V., Lévêque, F., 2003. High resolution magnetic survey for soil monitoring: detection of drainage and soil tillage effects. Earth and Planetary Science Letters 212 (1–2), 241–251]. However, when the magnetic anomalies are only a few nanoteslas (nT), the geologic and pedogenic signal must first be isolated from magnetic disturbances for this method to be useful. This paper investigates the instrumental artifacts and environmental disturbances to adapt the survey protocol to slightly magnetic soils. Among the possible instrumental sources of disturbances listed and quantified, the most significant are: 1) The battery effect upon sensors 2 m away (classic...
Tipo: Journal Article Palavras-chave: MAGNETOMETRE A CESIUM; SOLS COTIERS; ONDE SISMOMAGNETIQUE HIGH-RESOLUTION MAGNETIC SURVEY; CAESIUM MAGNETOMETER; SEISMOMAGNETIC WAVE CONVERSIONS; SURVEY PROTOCOL; MARSHLAND SOILS.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007527d7f3e&uri=/notices/prodinra1/2010/09/
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Structural characteristics of clay-dominated soils of a marsh and a palaeosol in a crossed diagram Inra
Bernard, M.; Dudoignon, P.; Pons, Y.; Chevallier, C.; Boulay, L..
Although the shrink-swell phenomenon of clays has been thoroughly studied, the in situ relation of the shrinkage curve to the structure profile is rarely presented from the shrinkage limit to the liquid limit. We studied the consolidated structure of clay-dominated (<2 μm) soils formed on ‘pseudo-liquid’ marsh sediments in the ‘Marais de l’Ouest’ (France). The profiles were studied in a grassland field and in a sunflower field from unsaturated surface soils down to deeper, saturated, levels characterized by a very large water content (100% by weight). The consolidation states were quantified recording cone resistance (Qd) profiles using a dynamic penetrometer in successive seasons. These Qd profiles were compared with the associated wet density and...
Tipo: Journal Article Palavras-chave: SOL ARGILEUX; PALAEOSOL SHRINKAGE CURVE; CLAY-DOMINATED SOIL; MARSH.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007b7b82730&uri=/notices/prodinra1/2010/09/
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The contribution of crop-rotation organization in farms to crop-mosaic patterning at local landscape scales Inra
Thenail, C.; Joannon, A.; Capitaine, M.; Souchere, V.; Mignolet, C.; Schermann, N.; Di Pietro, F.; Pons, Y.; Gaucherel, C.; Viaud, V.; Baudry, J..
Farming activities are major drivers of the landscape-related ecological patterning because of their multiple influences on both non-arable and arable landscape elements and mosaics. Uncertainties still remain about the way individual farmer decisions and the aggregation of their activities in space contribute to these mosaics at local landscape scales, therefore about possible levers of action in farms for ensuring sustainable landscapes. The general objective of the present study was to give an assessment of the way farms contribute to crop-mosaic patterning at local landscape scales. We developed a method for comparing five contrasted local study cases of agriculture (five farm sets), by combining a statistical modeling of crop-rotation organization in...
Tipo: Journal Article Palavras-chave: CROP ROTATION; FARMING SYSTEM; CROP MOSAIC; CONNECTEDNESS; LOCAL LANDSCAPE SCALES; MODELING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009cea88fdb&uri=/notices/prodinra1/2010/09/
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Vertical porosity profile of a clay-rich marsh soil Inra
Dudoignon, P.; Causseque, S.; Bernard, V.; Hallaire, V.; Pons, Y..
The evolution of clay soil porosity is currently demonstrated via the shrinkage curves in a large water content domain spreading from a shrinkage limit to a liquidity limit. In fact, the parallel between in situ profiles and the shrinkage curves in such a large water content range is difficult to obtain because of the lack of earth pressure in the laboratory tests and in situ limited water contents. The vertical distribution of porosity throughout a clay-rich marsh soil profile was studied in a grassland field with samples taken from the soil surface characterized by water contents near their shrinkage limit down to 2.00 m deep saturated sediments over their liquidity limit. The depth of the plasticity limit isolates a soil in a solid state characterized...
Tipo: Journal Article Palavras-chave: SOL; POROSITE; EAU; ANALYSE D'IMAGE CLAY SOIL; SHRINKAGE CURVES; IMAGE ANALYSIS; POROSITY.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200928b853f9&uri=/notices/prodinra1/2010/09/
Registros recuperados: 7
Primeira ... 1 ... Última
 

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