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Registros recuperados: 17
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ARE HARVEST AND SENSORY QUALITY OF LETTUCE AND ONION INFLUENCED BY GROWING CONDITIONS IN A CONVENTIONAL AND THREE ORGANIC CROPPING SYSTEMS? Organic Eprints
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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Capacity of Deep Rooted Species to Take Up Water and Nutrients from Deep Soil Layers Organic Eprints
Dresbøll, Dorte Bodin; Rasmussen, Camilla Ruø; Thorup-Kristensen, Kristensen.
Introduction Agricultural cropping systems generally have a limited use of water and nutrients from the soil below 1m depth. However, several plant species have much deeper root systems, and if included in cropping systems, these would allow for exploitation of otherwise unused resources from deep soil layers. In a unique facility consisting of 12, 4m high ‘root towers’ we examined the root development and root activity in different soil layers of different biannual/perennial plant species. Methods Four plant species lucerne (Medicago sativa), rosinweed (Silphium integrifolium), intermediate wheatgrass (Thinopyrum intermedium), and dyers voad (Isatis tinctoria) were grown in soil in large rhizotrons (root towers) (4m×1.2m×0.6 m). Root growth was...
Tipo: Conference paper, poster, etc. Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Crop health; Quality; Protection.
Ano: 2018 URL: http://orgprints.org/34364/3/Poster%20-%20Dorte%20Bodin%20Dresb%C3%B8ll_34364.pdf
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Chicory Grows Roots Below 3 m Is That Beneficial under Water Stress? Organic Eprints
Rasmussen, Camilla Ruø; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Introduction Water scarcity is a major limitation to crop production worldwide. Deep-rooted crops can potentially allow exploitation of water that more shallow rooted crops cannot access. Several agricultural crops grow roots of several meters depth within a growing season, and thereby get access to water originating from wet season surplus precipitation stored in the soil. The aim of this study was to test the hypotheses 1) that chicory roots can grow below 3 m within a growing season and 2) that chicory shifts its water uptake downwards when the top soil dries out. Materials and Methods Chicory (Cichorium intybus L. cv Chicoree Zoom F1) was grown in 4 m tall rhizotrons in monoculture under dry or wet conditions and intercropped with either ryegrass...
Tipo: Conference paper, poster, etc. Palavras-chave: Production systems Crop health; Quality; Protection Irrigation and drainage.
Ano: 2018 URL: http://orgprints.org/34370/3/Poster%20-%20Camilla_34370.pdf
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Crop yield, root growth, and nutrient dynamics in a conventional and three organic cropping systems with different levels of external inputs and N re-cycling through fertility building crops Organic Eprints
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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Cultivar differences in early spatial distribution of wheat, onion and lettuce roots Organic Eprints
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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Delayed nutrient application affects mineralisation rate during composting of plant residues Organic Eprints
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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Determining deep root activity in arable fields by the core-labelling technique (CLT) Organic Eprints
Han, Eusun; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Introduction: Deep roots have the potential to exploit plant resources otherwise inaccessible. The aim of this study was to develop a method, the Core-Labelling Technique (CLT), to measure root activity down to 2.5 m of soil depth under field conditions. Materials and Methods: Two stainless steel ingrowth-cores, 0.1 m in diameter and 0.55 m in length, were filled with soil labelled with nutrient tracers, i.e., LiCO3, CsCO3, Na2SeO4, RbCO3 and 15NH4Cl. The labelled cores were placed into an access-tube having openings at 1.0 m and 2.5 m of soil depth. They were kept under a lucerne (Medicago sativa) crop for 60 days, after which, the root length density (RLD) and concentration of tracers in shoot biomass (including a control) were measured. Results:...
Tipo: Conference paper, poster, etc. Palavras-chave: Soil biology; Nutrient turnover; Soil tillage; Farm nutrient management.
Ano: 2018 URL: http://orgprints.org/33942/1/Poster%20-%20Eusun_final.pdf
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Identification of deep-rooting crop species in arable subsoil by the minirhizotron technique Organic Eprints
Han, Eusun; Havmøller, Lisa; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Our current understanding of the plant deep root system and its relevance for crop production is limited. A field trial was established in order to monitor the root growth of various deep-rooted crops down to 5 m of soil depth with the minirhizotron technique. Root intensity (RI: intersections m-1) and maximum rooting depth (m) of seven different crop species indicate varying degree of root penetration capacity among the tested crops. Overall, within one season over 89 % of RI was concentrated at 0-1.0 m of soil depth. Sugar beet (1.4 m) as an annual crop showed the most rapid root growth rate (10.6 mm day-1). On average the perennials resulted in 0.7 m of maximum rooting depth (5.6 mm day-1), which indicates their potential to establish deep root systems...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop husbandry; Soil.
Ano: 2017 URL: http://orgprints.org/36656/1/360a_OWC17%2520science%2520track%2520proceedings%2520in%2520TR_54_Vol1_box.pdf
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Kompost til økologiske væksthuse Organic Eprints
Dresbøll, Dorte Bodin.
Ved produktion af væksthuskulturer er der behov for tilførsel af meget store mængder næring. Da plantenæringsstoffer samtidig er en begrænset ressource i økologisk planteproduktion, kan det være vanskeligt at skaffe tilstrækkelig næring fra økologiske husdyrbrug, hvor gødningen til økologiske væksthuse hovedsagligt kommer fra. I ORCTOM-projektet er næringsmæssig kvalitet og struktur af kompost baseret på lettilgængelige planterester derfor blevet undersøgt.
Tipo: Newspaper or magazine article Palavras-chave: Greenhouses and coverings; Composting and manuring.
Ano: 2003 URL: http://orgprints.org/4650/1/4650.pdf
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Long-term stability and mineralisation rate of compost is influenced by timing of nutrient application during composting of plant residues Organic Eprints
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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Optimisation of growing media for organic greenhouse production Organic Eprints
Dresbøll, Dorte Bodin.
Organic production of greenhouse crops has developed during the last decade. Greenhouse crops in general, have higher nutrient demands than field grown crops and therefore, in order to optimise production it is essential to focus on the growing media and fertilisation. The studies comprised in this dissertation describe the suitability of compost as a growing medium for organic greenhouse crops. The choice and composition of plant material as well as shredding of material and management of composting processes can alter the nutritional and structural quality of compost based on plant residues. This dissertation is based on several studies on the nutritional quality of compost as well as studies of the structural properties of different straw materials and...
Tipo: Thesis Palavras-chave: Vegetables Ornamentals; Flower bulbs and tree nurseries Composting and manuring.
Ano: 2004 URL: http://orgprints.org/3495/1/3495.pdf
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Rodudviklingens betydning for planternes forsyning med vand og næringsstoffer Organic Eprints
Dresbøll, Dorte Bodin.
En succesfuld forsyning med vand og næringsstoffer stiller krav til rodudviklingen. Mange rødder er en fordel, men det afgørende er rodsystemets udvikling både i tid og rum.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop husbandry; Farm nutrient management.
Ano: 2017 URL: http://orgprints.org/32132/1/Rodudviklingens%20betydning%20for%20planternes%20forsyning%20med%20vand%20og%20n%C3%A6ringsstoffer.pdf
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Sorter med bedre rodvækst til økologisk dyrkning Organic Eprints
Thorup-Kristensen, Kristian; Andresen, Marianne; Dresbøll, Dorte Bodin.
Resultater fra forsøg med sortsvariation i tidlig rodvækst hos vårhvede, løg og salat. Seks moderne sorter af hver art blev undersøgt, og samlet rodvækst, rodfordeling i jorden og næringsstofoptagelse blev målt. Forsøget viste store sortsforskelle på rodvæksten inden for alle 3 arter.
Tipo: Newspaper or magazine article Palavras-chave: Composting and manuring Nutrient turnover Breeding; Genetics and propagation.
Ano: 2014 URL: http://orgprints.org/28002/3/28002.pdf
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Structural changes of plant residues during decomposition in a compost environment Organic Eprints
Dresbøll, Dorte Bodin; Magid, Jakob.
We investigated the actual degradation of plant material during composting by qualitative methods using Scanning Electron Microscopy (SEM) combined with quantitative chemical methods. Decomposition of Mischanthus (Mischanthus oogiformis L.), hemp (Cannabis sativa L.) and wheat (Triticum aestivum L.) straw was observed by placing litterbags containing these materials in compost piles. Hemp and Mischanthus straw were more stable than the wheat straw, but the two materials differed in the way they were degraded despite similar chemical composition. Hemp straw was broken down in more flexible structures compared to the rigid breakdown of Mischanthus straw. We concluded that the anatomical arrangement of the tissue is just as an important part of the...
Tipo: Journal paper Palavras-chave: Composting and manuring.
Ano: 2006 URL: http://orgprints.org/3456/1/3456.pdf
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Structural differences in wheat (Triticum aestivum), hemp (Cannabis sativa) and Mischanthus (Mischanthus ogiformis) affect the quality and stability of compost as growing medium Organic Eprints
Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Physical properties as well as process parameters were examined in three different composts based on plant residues. The wheat compost was a mixture of clover-grass and wheat straw in a ratio of 3:5, the Mischanthus compost was composed of the same materials and contained Mischanthus straw in addition in a ratio of 3:2.5:2, and the hemp compost was based on clover-grass, wheat and hemp straw also in a ratio of 3:2.5:2. The wheat and Mischanthus composts both had an initial C/N ratio of 26 and process parameters such as nitrogen losses and mineralisation pattern did not differ between the two compost types. The hemp compost had a much lower initial C/N ratio of 16 as the hemp straw was harvested fresh, resulting in higher losses and more mineralised...
Tipo: Journal paper Palavras-chave: Ornamentals; Flower bulbs and tree nurseries Composting and manuring.
Ano: 2005 URL: http://orgprints.org/3457/1/3457.pdf
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The effect of Intercropping on the Deep Root Development and Nutrient Uptake in a Sugar Beet – Chicory Mixture. Organic Eprints
Czaban, Weronika; Clement, Corentin; Han, Eusun; Dresbøll, Dorte Bodin; Thorup-Kristensen, Kristian.
Sustaining an increasing human population with decreasing soil resources is a great challenge of the 21st century. Suboptimal availability of water and N are primary limitations to plant growth in the low-input agroecosystems in developing nations, whereas intensive fertilization at the cost of substantial environmental pollution is a problem in rich countries. The development of crops with greater rooting depth addresses these challenges. Deeper rooting improves water and nutrient uptake, which in turn reduces the need of application of external resources. In our study, we investigate the effect of intercropping on the deep root development and nutrient uptake in sugar beet – chicory mixture. The crops were chosen due to their deep roots and similar...
Tipo: Conference paper, poster, etc. Palavras-chave: Farm nutrient management.
Ano: 2018 URL: http://orgprints.org/33979/1/Poster%20-%20designguide%20FINAL_Weronika%20Czaban.pdf
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Vegetable quality in a conventional and three organic cropping systems Organic Eprints
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 if conventional and organic cropping systems, which differ clearly in strategies for nutrient and pest management, influence the harvest and sensory quality of the products? Lettuce and onion were grown in a conventional and three organic vegetable cropping systems with different levels of external inputs and use of cover- and inter-crops for nutrient re-cycling and natural pest management in the period of 2007-2009 (VegQure project). The crop rotation consisted of 8 fields of vegetables and cereals. Onion was grown after a year of oat and iceberg lettuce after winter rye. There were 3 replicates of each cropping system each...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop combinations and interactions; Vegetables; Consumer issues.
Ano: 2011 URL: http://orgprints.org/19587/3/19587.pdf
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