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| Registros recuperados: 35 | |
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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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| Ortolani, Livia; Kristensen, Hanne L.; Campanelli, Gabriele; Bavec, Martina; Bavec, Franc; von Fragstein, Peter; Bergmam, Astrid; Leteo, Fabrizio; Canali, Stefano. |
| This paper presents the findings of an assessment aimed to evaluate, in terms of cost and energy consumption, the introduction of living mulches in different organic vegetable systems producing cauliflower. The study was carried out in three European countries (IT, SLO and DK) in the frame of the InterVeg project (Core Organic II). The achievements demonstrated that, in economic terms, farmers’ choice of a specific technique, like living mulch instead of sole cropping, can be influenced by two key elements: human labor and fossil fuel consumption. Different organic systems have a different proportion in using the two inputs depending on the specific farm strategy. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm economics; Technology assessment; Air and water emissions; Policy environments and social economy; Weed management; Denmark; Italy; Europe. |
| Ano: 2014 |
URL: http://orgprints.org/23713/1/23713%20Ortolani%20et%20al.%20_ISOFAR%202014_MM.pdf |
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| Kristensen, Hanne L.; Kidmose, Ulla; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian. |
| Differences in nutrient availability and methods of pest management may affect crop growth and product quality. The question is whether conventional and organic cropping systems, which differ clearly in strategies for nutrient and pest management, influence the harvest and sensory quality of the products? With the aim to elucidate this question, lettuce and onion were grown in a conventional and three organic cropping systems with increasing levels of nutrient re-cycling and use of intercrops for natural pest management in the period of 2007-2009. The conventional and first organic system relied fully on external inputs in the form of NPK or liquid manure for nutrient management, respectively. In the second organic system, low external inputs of liquid... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Vegetables. |
| Ano: 2011 |
URL: http://orgprints.org/19586/3/19586.pdf |
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| Ciaccia, Corrado; Kristensen, Hanne L.; Campanelli, Gabriele; Bavec, Franc; von Fragstein, Peter; Robacer, Martina; Testani, Elena; Canali, Stefano. |
| Two field experiments were carried out in order to test the effect on weed management of living mulch introduction in organically managed cauliflower in Central Italy and leek in Denmark. Burr medic and Dyers Woad were sown as living mulch in Central Italy and Denmark, respectively. Different living mulch managements and cultivars were tested in strip plot designs. The main objective of the research was the evaluation of their effects on both crop growth and weed suppression. Biomass of crops, living mulches and weeds were measured and competitive indices were used to assess their competitive relationships. The results showed the effect of the agronomic choices (interseeding timing and crop cultivar) on weed suppressiveness and in avoiding living mulch... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Weed management. |
| Ano: 2014 |
URL: http://orgprints.org/23772/1/23772_Ciaccia%20et%20al.%20OWC14_MM.pdf |
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| Kristensen, Hanne L.; Thorup-Kristensen, Kristian. |
| The root depths of annual crops vary from 0.2 m to more than 2 m depending on root growth rate and length of growing season. However, studies of root growth and N uptake are often restricted to a depth of 1 m or less, as root biomass is assumed to be negligible below this depth. We have studied the importance of root growth and N uptake to a depth of 2.5 m in fully grown field vegetables and cover crops by use of minirhizotrons and deep point placement of 15N. Deep rooted crucifereous crops were found to have high root densities to a depth of 1.5-2 m and high 15N uptake to this depth. The work shows that knowledge of the interactions between root growth and soil N below a depth of 1 m are important to understand crop N uptake and nitrate leaching from... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Crop combinations and interactions; Vegetables. |
| Ano: 2006 |
URL: http://orgprints.org/11461/1/Deep_Roots_and_N_Uptake.htm |
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| Burgio, Giovanni; Kristensen, Hanne L.; Campanelli, Gabriele; Bavec, Franc; Bavec, Martina; von Fragstein und Niemsdorff, Peter; Depalo, Laura; Lanzoni, Alberto; Canali, Stefano. |
| The aim of this study was to evaluate the effect of cover crops on pest/beneficial dynamics and to test the potential of living mulch on enhancing biological control against insect pests. The research, carried out in the frame of the InterVeg (Core Organic II) project, involved four European countries: Germany, Slovenia, Denmark and Italy. Three crops were tested: cauliflower, leek and artichoke. The preliminary results obtained in Italy on cauliflower, indicated that the living mulch did not affect the infestation of the cabbage butterfly, Pieris brassicae, showing no detrimental effect of this technique on pest dynamics. A very high level of parasitization against cabbage butterfly was detected either in the living mulch crop (88%) and in the sole one... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services; Italy. |
| Ano: 2014 |
URL: http://orgprints.org/23908/1/23908%20Burgio%20et-revised_MM.pdf |
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| Seljåsen, Randi; Kristensen, Hanne L.; Lauridsen, Charlotte; Wyss, Gabriela S.; Kretzschmar, Ursula; Birlouez-Aragone, Inès; Kahl, Johannes. |
| The aim of this review is to provide an update on factors contributing to quality of carrots, with special focus on the role of pre- and postharvest factors and processing. The genetic factor shows the highest impact on quality variables in carrots, causing a 7–11-fold difference between varieties in content of terpenes, β-carotene, magnesium, iron and phenolics as well as a 1–4-fold difference in falcarindiol, bitter taste and sweet taste. Climate-related factors may cause a difference of up to 20-fold for terpenes, 82% for total sugars and 30–40% for β-carotene, sweet taste and bitter taste. Organic farming in comparison with conventional farming has shown 70% higher levels for magnesium and 10% for iron. Low nitrogen fertilisation level may cause up to... |
| Tipo: Journal paper |
Palavras-chave: Food security; Food quality and human health Crop health; Quality; Protection Post harvest management and techniques. |
| Ano: 2013 |
URL: http://orgprints.org/25315/1/Quality%20of%20carrots%20as%20affected%20by%20pre-%20and%20postharvest%20factors%20and%20processing.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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| Kristensen, Hanne L.; Debosz, Kasia; McCarty, Greg W.. |
| Tillage is known to decrease soil organic nitrogen (N) and carbon (C) pools with negative consequences for soil quality. This decrease is thought partly to be caused by exposure of protected organic matter to microbial degradation by the disturbance of soil structure. Little is known, however, about the short-term effects of tillage on mineralization of N and C, and microbial activity. We studied the short-term effects of two types of tillage (conventional plough- and a non-inverting-tillage) on mineralization and microbial N and C pools in a sandy loam under organic plough-tillage management. The release of active and protected (inactive) N by tillage was further studied in the laboratory by use of 15N labelling of the active pool of soil N followed by... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil quality; Soil biology. |
| Ano: 2003 |
URL: http://orgprints.org/1537/1/Shortterm.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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| 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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| Registros recuperados: 35 | |
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