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Registros recuperados: 112 | |
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Dresbøll, Dorte Bodin; Magid, Jakob; Thorup-Kristensen, Kristian. |
The long-term nitrogen mineralization and stability of compost based on easily available plant residues was examined. Four different composts were prepared from wheat straw and clover-grass hay, one treatment receiving all material initially (100/0), two treatments where addition of 75% of the clover-grass was postponed for 3 weeks (75/25,3w) respectively 8 weeks (75/25,8w) and one treatment receiving only 25% of the clover-grass added to the other treatments (25/0). Mineralization and stability of the compost was followed for 24 weeks in leaching tubes, leached regularly by 0.01 M CaCl2. Postponing the addition of the clover-grass hay for 3 weeks (75/25,3w) during composting had a significant effect on the N mineralization rate leading to more mineralised... |
Tipo: Journal paper |
Palavras-chave: Composting and manuring. |
Ano: 2006 |
URL: http://orgprints.org/3494/1/3494.pdf |
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Stavridou, Eleftheria; Thorup-Kristensen, Kristian; Young, Scott D.. |
Selenium (Se) release from four plant species (Indian mustard, fodder radish, Italian ryegrass and hairy vetch) was measured under controlled leaching conditions and in a pot incubation experiment as part of a study of the potential for using these plant species as Se catch crops. Catch crops may reduce Se leaching and, by subsequent release of Se from the plant material, increase the available Se for succeeding crops. Plants grown both without and with Se addition (250 g Se/ha) were tested. In the leaching experiment, frozen plant material was incorporated into soil columns and incubated at room temperature for up to 19 weeks. The results showed that Se concentrations in the leachate were higher when Se-enriched plant material was incorporated in the... |
Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Farm nutrient management. |
Ano: 2011 |
URL: http://orgprints.org/19589/4/19589.pdf |
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Thorup-Kristensen, Kristian. |
Kapitlet handler om muligheden for at ændre reglerne for dyrkning af efterafgrøder, således at effekten af at dyrke efterafgrøder forbedres. Der fokuceres på muligheden for at 1) inddrage nye arter af efterafgrøder, især for at opnå større roddybde, 2) at ændre regler om nedmuldningstid så der i hvert fald på sandjord bliver krav om vinterfaste efterafgrøder der først nedmuldes om foråret, 3) at sikre en mere optimal placering af efterafgrøderne i sædskiftet og på dyrkning af efterafgrøder primært på bedriftstyper hvor der er mest kvælstof i kredsløb og hvor efterafgrødern derfor kan få størst effekt, og 4) mere overordnet at dyrke efterafgrøder i de egne af landet hvor de vil gøre den størst muligt miljømæssige gavn. |
Tipo: Report chapter |
Palavras-chave: Nutrient turnover Cereals; Pulses and oilseeds Production systems Vegetables. |
Ano: 2004 |
URL: http://orgprints.org/3890/1/3890.rtf |
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Thorup-Kristensen, Kristian. |
The abstract describes experiments with different cropping systems for organic greenhouse production of tomatoes. In this experiment two main questions are adressed. As greenhouse tomato production is a very intensive monoculture production, problems with nutrient supply and balances are expected, and problems with soilborne pests and diseases are widespread. To counter such problems, we compare the normal method of soil grown tomatoes with systems where tomatoes are grown in compost filled boxes. This allows to control nutrient losses and prevent carry over of diseses and pests in the soil. We also study an intermediate system, where where tomatoes are established in compost filled boxes, but the roots are allowed to develop also in the soil outside the... |
Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Crop health; Quality; Protection Vegetables Greenhouses and coverings. |
Ano: 2003 |
URL: http://orgprints.org/4644/1/4644.rtf |
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Wang, Yaosheng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
Background and Aims A number of root and root hair traits have been proposed as important for acquisition of P. However, it remains unknown whether these traits are most important in determining macro- and micronutrient uptake at low soil fertility. This study investigated the variations in root and root hair traits among spring wheat genotypes and examined which root and root hair traits are most important for high uptake of macro- and micronutrients. Methods Six spring wheat genotypes were grown in a soil with low nutrient availability. The root and root hair traits as well as the content of macro- and micronutrients were identified. Results A significant genetic variability in root and root hair traits was found. High root growth vigour and long and... |
Tipo: Journal paper |
Palavras-chave: Soil quality Composting and manuring Breeding; Genetics and propagation. |
Ano: 2014 |
URL: http://orgprints.org/27912/8/27912.pdf |
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Thorup-Kristensen, Kristian; Dresbøll, Dorte Bodin; Kristensen, Hanne L.. |
One core idea behind organic production is that cropping systems should be less dependent on resource import than conventional production and minimize negative environmental effects. This study aimed to test novel organic rotations, designed to reduce reliance on external resource import. We compared a conventional system (C) and an organic system relying on manure import (O1) to two rotations (O2 and O3), both relying on autumn cover crops for soil fertility, and in O3 green manure rows were left as intercrops. Resource import differed between 149, 85, 25 and 25 kg N ha-1 year-1 in C, O1, O2 and O3. Crop yields were lower in the organic systems (on average 82% of conventional yields), differing among crops, when based on the area grown with main crops.... |
Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Farming Systems; Crop husbandry; Soil; Vegetables; Farm nutrient management. |
Ano: 2011 |
URL: http://orgprints.org/19701/4/19701.pdf |
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Brandt, Kirsten; Nygaard Larsen, Hanne; Andersen, Jens-Otto; Mølgaard, Jens-Peter; Lauridsen, Charlotte; Jørgensen, Henry; Gundersen, Vagn; Larsen, Erik; Badsberg, Jens Henrik; Thorup-Kristensen, Kristian. |
Many consumers believe that food from plants grown under certain conditions, such as organic agriculture, will benefit health more than conventional food. This cannot be determined simply by analysing the material, since our understanding of the connections between food components and health is still to imprecise for such a purpose. Rather than waiting until basic research provides the knowledge needed for this approach, in the spring of 2001 we have initiated a project to study physiological effects of plant quality directly, in an animal experiment. The following cultivation treatments are used to grow plants that are typical ingredients for a human diet (potato, mature peas, kale, spring wheat, oilseed rape, carrots and apples): 1. A model of a... |
Tipo: Conference paper, poster, etc. |
Palavras-chave: Food security; Food quality and human health Crop health; Quality; Protection Specific methods. |
Ano: 2001 |
URL: http://orgprints.org/1702/1/DARCOFposterhealthlille.pdf |
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Frøseth, Randi Berland; Bakken, Anne Kjersti; Bleken, Marina Azzaroli; Riley, Hugh; Pommeresche, Reidun; Thorup-Kristensen, Kristian; Hansen, Sissel. |
In repeatedly mown and mulched green manure leys, the mulched herbage contains substantial amounts of nitrogen (N), which may only slightly contribute to the following crops’ nutrient demand. The objective of the present work was to evaluate the effect of alternative strategies for green manure management on the yield and N recovery of a subsequent spring barley crop, and their short term effects on soil structure and earthworm populations. A field trial was run from 2008 to 2011 at four sites with contrasting soils under cold climate conditions. We compared several options for on-site herbage management and the application of anaerobically digested green manure herbage. Depending on the site, removal of green manure herbage reduced the barley grain yield... |
Tipo: Journal paper |
Palavras-chave: Farm nutrient management. |
Ano: 2014 |
URL: http://orgprints.org/26212/2/Fr%C3%B8seth%20et%20al%202014%20Effects%20of%20green%20manure%20herbage%20management.pdf |
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Thorup-Kristensen, Kristian. |
Brassica plant species show some characteristics in their use of plant nutrients which make them different from most other crops. These characteristics often make brassicas difficult to grow in low-input systems with limited nutrient availability, but at the same time they also make some brassica species valuable tools for reducing nitrate leaching losses and improving N management in farming systems. The paper presents experimental results on brassica crops as main crops and cover crops. |
Tipo: Conference paper, poster, etc. |
Palavras-chave: Vegetables; Air and water emissions. |
Ano: 2008 |
URL: http://orgprints.org/16320/1/16320.pdf |
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Wang, Yaosheng; Andersen, Sven Bode; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
Root and root hairs of plants have been intensively studied in solution culture; however, correlation of such measurements in solution culture with development in soil is poorly understood. This study compared growth of roots and root hairs as well as uptake of macro- and micronutrients of six spring wheat varieties in solution culture under P stress and P abundance and in a low fertility soil. Results showed that root length and surface area under P stress was significantly positively correlated with that in the low fertility soil, while no such correlation was apparent for root hair length and density. In absolute terms the root length, surface area, root hair length and density of spring wheat varieties were substantially higher in soil than in solution... |
Tipo: Journal paper |
Palavras-chave: Soil quality Breeding; Genetics and propagation. |
Ano: 2014 |
URL: http://orgprints.org/27913/3/27913.pdf |
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Pedersen, Anders; Zhang, Kefeng; Jensen, Lars Stoumann; Thorup-Kristensen, Kristian. |
Plant soil and atmosphere models are commonly used to predict crop yield and associated environmental consequences. Such models often include complex modelling of water movement, soil organic matter turnover and above ground plant growth. However, the root modelling in these models is often very simple, partly due to a limited access to experimental data. Here we propose a root model developed to describe root growth, root density and nitrogen uptake. The model focuses on annual crops, and attempts to model root growth of different crop species and row crops and its significance for nitrogen uptake from different parts of the soil volume. |
Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Biodiversity and ecosystem services. |
Ano: 2007 |
URL: http://orgprints.org/10745/1/10745.pdf |
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Registros recuperados: 112 | |
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