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| Registros recuperados: 112 | |
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| Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian. |
| The hypothesis that delayed addition of nutrient rich material to compost would influence the mineralisation pattern was investigated by studying N turnover in compost based on wheat straw and clover-grass hay. After 7½ weeks of composting almost twice as much N was mineralised when the addition of of some of the N-rich clover-grass hay was postponed, suggesting that this influenced the microbial succession. The delayed addition resulted in a second temperature peak and a decline in the pH. Despite the altered conditions no significant effect was observed on the weight loss or loss of C and N. In conclusion, compost processes can in a simple way be affected by delayed substrate application leading to a higher nutrient availability without altering other... |
| Tipo: Journal paper |
Palavras-chave: Vegetables Composting and manuring Ornamentals; Flower bulbs and tree nurseries. |
| Ano: 2005 |
URL: http://orgprints.org/3419/1/3419.pdf |
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| Pedersen, Anders; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann. |
| This model analysis of catch crop effects on nitrate retention covered three soil texture classes sand, loamy sand, sandy loam) and three precipitation regimes in a temperate climate representative for northern Europe (annual precipitation 709-1026 mm) for a period of 43 years. Simulations were made with two catch crops (ryegrass and Brassica) with different rooting depths, and soil N effects in the next spring were analysed to 0.25, 0.75 and 2.0 m depth to represent the catch crop effect on following crops with different rooting depths. Nitrate retained without a catch crop was generally located in deeper soil layers. In the low precipitation regime the overall fraction of nitrate retained in the 0-2.0 m soil profile was 0.23 for the sandy soil, 0.69 for... |
| Tipo: Journal paper |
Palavras-chave: Soil; Farm nutrient management; Air and water emissions. |
| Ano: 2009 |
URL: http://orgprints.org/16122/1/16122.pdf |
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| Thorup-Kristensen, Kristian. |
| Artiklen viser resultaterne fra de første 6 år af et økologisk grønsagssædskifte. I sædskiftet dyrkes porrer, hvidkål, løg, gulerødder og ærter, foruden byg og grøngødning. Sædskiftet er et 6-marks skifte, der er gennemført uden import af gødning. Forsyningen af afgrøderne med kvælstof er sikret ved udnyttelse af efterafgrøder og grøngødning samt ved udnyttelse af afgrøder med dyb rodvækst. Resultaterne viser, at vi har kunnet opnå høje udbytter af grønsagerne i sædskiftet, selv af de meget krævende grønsagsarter som hvidkål og porre. En af de vigtigste faktorer har været at holde markerne bevoksede i efteråret, det har klart reduceret nitratindholdet i jorden i efteråret og dermed risikoen for udvaskning, og samtidig klart øget kvælstofindholdet i jorden... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Vegetables Cereals; Pulses and oilseeds. |
| Ano: 2002 |
URL: http://orgprints.org/1128/1/sandefjord.pdf |
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| Thorup-Kristensen, Kristian; Kristensen, Hanne L.. |
| During 2005 to 2009 three approaches to organic vegetable rotations were compared to a conventional rotation in an interdisciplinary project. The organic rotations differed in their reliance on animal manure vs. cover crops and intercrops, but the rotation of main vegetable and cereal crops were identical in the four rotations. One organic rotation (O1) relied on import of manure for supply of nutrients, in another (O2) cover crops were used to replace most of the manure import, and in (O3) also intercrops were grown to improve natural pest regulation. The yearly import of nitrogen were on average 149, 94, 28, and 28 kg N.ha-1 in C, O1, O2, and O3 respectively. On average the yield in the O1 system was 83% of the yield in the conventional system. In the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Vegetables. |
| Ano: 2010 |
URL: http://orgprints.org/19585/4/19585.pdf |
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| Pedersen, Anders; Thorup-Kristensen, Kristian; Kristensen, Hanne Lakkenborg; Berntsen, Jørgen. |
| Dynamic plant/soil models are used to predict crop production, N dynamics and nitrate leaching loss of different cropping systems. To do this, the models simulate various aspects of plant biology, soil biology and soil physics. Correct simulation of root growth is critical for the simulation of nitrate leaching losses. Measurements have been made on crop root growth on two soil types, and the data used to improve the simulation of root growth within the FASSET model. The paper presents the results from root measurements on winter wheat, spring barley and sugar beets, and the root modelling approach we have developed. |
| Tipo: Journal paper |
Palavras-chave: Soil biology. |
| Ano: 2004 |
URL: http://orgprints.org/3879/1/3879.rtf |
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| Wang, Yaosheng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
| Rodsystemer er vigtige for planters optagelse af vand og næringsstoffer og dermed for vækst og ud-bytte, specielt under forhold med lav tilgæn- gelighed af jordens næringsstoffer. I det økologiske RDD projekt RoCo har vi undersøgt rodvækst, rodfordeling og roddybde samt rodhårs- karakteristika for forskellige sorter af vårhvede. Resultaterne af vores forsøg viser, at der er en stor variation i rod- og rodhårskarakteristika mellem forskellige vårhvedesorter, og disse er afgørende for, samt gene- tisk relateret til, afgrødens vækst og optagelse af næringsstoffer. Derfor er vital rodvækst og lange og tætte rodhår vigtige mål for selektion og fremtidig forædling af vårhvede til økologisk jordbrug. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Soil quality Nutrient turnover Breeding; Genetics and propagation. |
| Ano: 2014 |
URL: http://orgprints.org/27914/7/27914.pdf |
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| Andresen, Marianne; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian. |
| Organic plant production is generally dependent on import of plant nutrients from conventional farming 26 systems. With increasing focus on reducing the conventional import, increased nutrient use efficiency is an 27 aim in organic agricultural systems. One way to achieve this is by choosing nutrient efficient cultivars or by 28 breeding for such. It is especially in the plant establishment phase, that an efficient nutrient uptake is 29 important. At this stage, plants have limited root growth and thereby limited soil contact and nutrient 30 uptake. The possibility of the initial roots to exploit as large a volume as possible will therefore increase 31 nutrient uptake. In addition, in early spring nutrient levels in the soil are low as mineralization is... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Vegetables. |
| Ano: 2015 |
URL: http://orgprints.org/28005/9/28005.pdf |
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| Thorup-Kristensen, Kristian. |
| Danish farmers are required to grow around 300.000 hektares of catch crops each year, as part of the Danish regulations of N use and losses from agriculture. The rules set some minimum requirements about how to grow catch crops, but do not attempt to optimize the effects of the catch crops. In the paper it is discussed how farmers can improve the effects of catch crops, both the environmental effects and the effects on nitrogen supply for succeeding agricultural crops. It is shown that it is highly important which plant species are grown, as there are large differences in their root growth and winter hardines. It is also shown that the species choice may have suprising large effects on the N supply for the succeeding crop. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions Vegetables Composting and manuring. |
| Ano: 2005 |
URL: http://orgprints.org/8042/1/8042.pdf |
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| Jensen, Maja M.; Jørgensen, Henry; Halekoh, Ulrich; Watzl, Bernhard; Thorup-Kristensen, Kristian; Lauridsen, Charlotte. |
| BACKGROUND: Organic food is perceived as being of better quality and healthier than conventional foods although the scientific research on organic foodstuffs is highly contradictory. The aim of the present study was to investigate if an intake of carrots from four different cultivation systems grown in two consecutive years would influence various biomarkers of health in a rat model. All rats were fed a diet with 40% carrot content. The carrots were grown under conventional (C), “minimalistic” organic (O1), organic (O2), or “very” organic cultivation systems (O3). A control group (CO) being fed standard rat chow was included. RESULTS: The plasma α-tocopherol concentration was higher in the O2 carrot-based diet than in the C carrot based-diet in one year,... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general Food security; Food quality and human health. |
| Ano: 2012 |
URL: http://orgprints.org/19732/10/19732.pdf |
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| Båth, Birgitta; Kristensen, Hanne L.; Thorup-Kristensen, Kristian. |
| In two field experiments, growth of white cabbage in pure stands was compared with that of cabbage grown in living mulch systems to reduce pest attacks. The roots of the living mulch were pruned early in the season, with the aim of reducing competition and increasing growth of the white cabbage. Root pruning was shown to increase the above-ground biomass of white cabbage, with two prunings giving higher cabbage yields than one, but there were clear differences between the living mulch species tested (red clover, birdsfoot trefoil, salad burnet, winter rye). Below-ground growth and competition were examined by measuring root distribution in minirhizotrons and uptake of 15N placed at different soil depths. These studies showed that the ability of mulch... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Vegetables. |
| Ano: 2008 |
URL: http://orgprints.org/16319/1/EprintsRootPruning.pdf |
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| Thorup-Kristensen, Kristian. |
| I artiklen præcenteres resultater og erfaringer fra 8 års forsøg med økologisk grønsagssædskifte ved Danmarks JordbrugsForskning i Årslev. En af de centrale resultater er at det har meget stor effekt at holde markerne grønne i efteråret. Selvom der har ingået mange forskellige typer efterårsdække, fra helårsgrøngødning, til efterafgrøder med og uden bælgplanter og endda kålstub der har fået lov at gro videre efter at kålhovederne er høstet, så har det grundlæggende haft den samme effekt. Med plantedække i efteråret efterlades der langt mindre N i jorden som kan udvaskes, men om foråret mineraliseres der væsentligt mere N i jorden som kan udnyttes af den følgende afgrøde. Grøngødning giver naturligvis større mineralisering end f.eks. kålstub, men den... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Vegetables. |
| Ano: 2004 |
URL: http://orgprints.org/3882/1/3882.rtf |
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| Kristensen, Hanne L.; Thorup-Kristensen, Kristian. |
| Når man dyrker grøntsager i forurenet jord, er der risiko for, at afgrøderne via rødderne optager forureningsstoffer i uacceptabel grad, så de ikke er egnede til at spise. Ved dybereliggende forurening kan problemet teoretisk set imødegås ved at hindre, at rødderne trænger ned i den forurenede jord. To forsøg har imidlertid vist, at end ikke de tætteste geotekstiler i praksis kan standse rodvæksten af grønsager fuldstændigt. Dog kan nogle geotekstiler begrænse rodudbredelsen markant hos de fleste arter. |
| Tipo: Report |
Palavras-chave: Vegetables. |
| Ano: 2003 |
URL: http://orgprints.org/1543/1/geotekstiler.pdf |
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| Thorup-Kristensen, Kristian; Pedersen, Lene. |
| In organic farming winter wheat is typically grown after good pre-crops, as it pays well for this in terms of yield and quality. However, winter wheat develops slowly during the autumn, and much nitrate may be lost by leaching before spring. System with catch crops followed by spring wheat, or maybe catch crops intercropped with winter wheat could improve the utilization of the pre-crop effects in wheat cropping. In this experiment we studied wheat and catch crop root growth, crop and soil N dynamics, and effects on yield and baking quality in wheat cropping systems with catch crops. The results showed that the com-bination of catch crops and spring wheat was ideal for resource use, but also that winter wheat had a much deeper root system (c. 2.0 m) than... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Farm nutrient management. |
| Ano: 2006 |
URL: http://orgprints.org/7483/1/Paper_for_congress.doc |
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| Kidmose, Ulla; Jensen, Sidsel; Mejnertsen, Peter; Jørgensen, Johannes Ravn; Thorup-Kristensen, Kristian. |
| Eleven different wheat cultivars (Thaifun, Triso, Thasos, Trappe, Amaretto, Diskett, Økilde, Dache, Koga, Spelt and Emmer) were cultivated in an organic study using three different organic treatments (no manure, household waste compost and sewage sludge compost). Bread was baked with flour from each of the samples. The protein content, the gluten content and the Falling Number (FN) were measured for the flour samples and specific volum and sensory quality were measured on the bread samples. A big variation was found in protein and gluten content and Falling Number between flour samples of eleven different wheat cultivars that were grown using three different field treatments. A correlation was found between the protein content and the gluten content (R2 =... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Breeding; Genetics and propagation Crop health; Quality; Protection Farm nutrient management. |
| Ano: 2015 |
URL: http://orgprints.org/29517/1/Kidmose%20et.%20al.%20Manus%20cultivar%20RoCo%201.12.15.pdf |
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| Registros recuperados: 112 | |
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