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	Provedor de dados Organic Eprints (5) Autor Schjønning, P. (5) de Jonge, L.W. (5) Olesen, J.E. (4) Moldrup, P. (3) Christensen, B.T. (2) Greve, M.H. (2) Munkholm, L.J. (1) Mais... Palavra-chave Soil quality (5) "Organics" in general (3) Farming Systems (3) Production systems (3) Biodiversity and ecosystem services (2) Composting and manuring (1) Crop combinations and interactions (1) Soil (1) Mais... Tipo do documento Journal paper (2) Newspaper or magazine article (2) Conference paper, poster, etc. (1) Ano 2011 (1) 2010 (1) 2009 (3) País Germany (5) Idioma Inglês (4) dan (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Searching the critical soil organic carbon threshold for satisfactory tilth conditions – test of the Dexter clay:carbon hypothesis Organic Eprints Schjønning, P.; de Jonge, L.W.; Moldrup, P.; Christensen, B.T.; Olesen, J.E.. The concern for deteriorating soil structure at low soil organic matter (SOM) contents calls for better knowledge of SOM interaction with soil minerals as well as guidelines for soil conservation. We measured clay dispersibility in a field with a textural gradient. Our results support the concept of differentiating soil content of clay in a complexed and non-complexed part although our data did not point out an exact clay/OC ratio threshold. Our results also indicated that labile fractions of SOM may play an important role in soil physical behavior. We revisited literature data and found evidence that soil content of fines (<2 or <20 μm) is a major determinant of soil specific surface area (SA). We noted that soil SA coverage with SOM changed... Tipo: Conference paper, poster, etc. Palavras-chave: "Organics" in general; Production systems; Soil quality; Crop combinations and interactions; Farming Systems; Composting and manuring; Biodiversity and ecosystem services. Ano: 2010 URL: http://orgprints.org/18441/1/18441.pdf Effekten af økologiske driftsmetoder på ler-dispergering i kulstof-udpinte jorde Organic Eprints Schjønning, P.; de Jonge, L.W.; Olesen, J.E.; Greve, M.H.. Mange danske jorde – især på Øerne – har i dag et lavt indhold af organisk stof som følge af årtiers ensidige kornsædskifter og ringe brug af husdyrgødning. I denne artikel viser vi, at lerpartikler (kolloider) i jord med et lavt indhold af organisk stof frigøres til jordens vandfase (dispergering), hvilket efterfølgende kan have store påvirkninger af vigtige jordfunktioner. Økologiske driftsformer er generelt karakteriseret ved en stor tilbageførsel af organisk stof til jorden og kan derfor potentielt modvirke den omtalte lerdispergering. Tipo: Newspaper or magazine article Palavras-chave: "Organics" in general; Production systems; Soil quality; Farming Systems. Ano: 2009 URL: http://orgprints.org/18443/1/18443.pdf Organic farming effects on clay dispersion in carbon-exhausted soils Organic Eprints Schjønning, P.; de Jonge, L.W.; Olesen, J.E.; Greve, M.H.. Many Danish soils are depleted in organic matter (OM) after decades of intensive cereal cultivation (Schjønning et al., 2009). In this paper we show that clay particles (colloids) in soils that are low in OM content are easily dispersed in the soil water, which in turn has important effects on soil ecosystem functions and services. Organic farming systems generally tend to increase soil OM contents and may thus mitigate the negative effects. Tipo: Newspaper or magazine article Palavras-chave: "Organics" in general; Production systems; Soil quality; Farming Systems. Ano: 2009 URL: http://orgprints.org/18442/1/18442.pdf Soil Infrastructure, Interfaces & Translocation Processes in Inner Space (“Soil-it-is”): Towards a Road Map for the Constraints and Crossroads of Soil Architecture and Biophysical Processes Organic Eprints de Jonge, L.W.; Moldrup, P.; Schjønning, P.. Soil functions and their impact on health, economy, and the environment are evident at the macro scale but determined at the micro scale, based on interactions between soil micro-architecture and the transport and transformation processes occurring in the soil infrastructure comprising pore and particle networks and at their interfaces. Soil structure formation and its resilience to disturbance are highly dynamic features affected by management (energy input), moisture (matric potential), and solids composition and complexation (organic matter and clay interactions). In this paper we review and put into perspective preliminary results of the newly started research program “Soil-it-is” on functional soil architecture. To identify and quantify biophysical... Tipo: Journal paper Palavras-chave: Soil; Soil quality; Biodiversity and ecosystem services. Ano: 2009 URL: http://orgprints.org/16120/2/16120.pdf Clay dispersibility and soil friability – testing the soil clay-to-carbon saturation concept Organic Eprints Schjønning, P.; de Jonge, L.W.; Munkholm, L.J.; Moldrup, P.; Christensen, B.T.; Olesen, J.E.. Soil organic carbon (OC) influences clay dispersibility, which affects soil tilth conditions and the risk of vertical migration of clay colloids. No universal lower threshold of OC has been identified for satisfactory stabilization of soil structure. We tested the concept of clay saturation with OC as a predictor of clay dispersibility and soil friability. Soil was sampled three years in a field varying in clay content (~100 to ~220 g kg-1 soil) and grown with different crop rotations. Clay dispersibility was measured after end-over-end shaking of field-moist soil and 1-2 mm sized aggregates either air-dried or rewetted to -100 hPa matric potential. Tensile strength of 1-2, 2-4, 4-8 and 8-16 mm air-dried aggregates was calculated from their compressive... Tipo: Journal paper Palavras-chave: Soil quality. Ano: 2011 URL: http://orgprints.org/18939/4/18939.pdf Registros recuperados: 5 Primeira ... 1 ... Última

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