|
|
|
| Registros recuperados: 14 | |
|
|
| Dalgaard, T.. |
| Today, agriculture and food production has major implications for the use of fossil energy and other resources, and a sustainable development implies transition towards new systems, based on renewable resources. The reduction of external inputs to the farm through efficient management of materials and energy is a central part of the organic principles (IFOAM 2013), and in most countries standards are implemented in the form of nationally adapted, organic farming regulations, with significant implications for the potential energy and matter flows in- and out of the agricultural systems, and thereby the energy balance and the use of renewable resources. Consequently, it is important to develop new and more resource efficient production systems mitigating... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Environmental aspects; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/23561/1/23561.pdf |
| |
|
|
| Dalgaard, T.; Halberg, N.; Kristensen, I.S.. |
| This study is in two parts. In the first part, nitrogen N)losses per unit of milk and meat in Danish conventional and organic pig and dairy farming were compared on the basis of farm data. In the second part, organic and conventional dairy farming were compared in detail, using modelling. N-surpluses at different livestock densities, fodder intensities, and soil types were simulated. Finally, simulated N-surpluses were used in national scenarios for conversion to organic dairy farming in Denmark. In Part one, pig farming was found to have a higher N-efficiency than dairy farming. Organic pig production had a lower N-efficiency and a higher N-surplus per kg meat than conventional pig production. The possibilities to reduce N-loss by conversion to organic... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general. |
| Ano: 1998 |
URL: http://orgprints.org/15522/1/15522.pdf |
| |
|
| |
|
|
| Boegh, E.; Houborg, R.; Bienkowski, J.; Braban, C.; Dalgaard, T.; van Dijk, N.; Dragosits, U.; Holmes, E.; Magliulo, V.; Schelde, K.; Di Tommasi, P.; Vitale, V.. |
| Mapping was conducted using the REGFLEC model which is an automatic and image-based methodology developed for regional chlorophyll (Cab) and LAI estimation (i.e., Houborg et al., 2007; Houborg and Boegh, 2008; Houborg and Andersen, JARS 3, 2009). REGFLEC combines models for atmospheric correction (6S), canopy reflectance (ACRM) and leaf optics (PROSPECT). The REGFLEC tool corrects for impacts of atmospheric scattering and absorption, soil background reflectance and species specific vegetation characteristics (ie. leaf angle distribution). In this study, the REGFLEC model tool is applied to high spatial (10-20 m) resolution SPOT satellite data for mapping LAI and leaf N of agricultural landscapes located in Denmark, Poland, Scotland, the Netherlands and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services; Landscape and recreation; Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/19046/4/19046.pdf |
| |
|
|
| Johansen, A.; Hauggaard-Nielsen, H.; Ambus, P.; Dalgaard, T.; Jørgensen, U.; Nielsen, A.M.; Nielsen, L.H.; Olesen, J.E.; Roepstorff, A.; Skytte, K.; Smith, J.E.; Thomsen, A.B.; Carter, M.S.; Jensen, E.S.. |
| Production of bioenergy in organic agriculture may be implemented in the future to reduce the reliance on non-renewable fossil fuels and minimize greenhouse gas (GHG) emissions. Therefore it is important to assess the potential effect this may have on soil quality and biological parameters. This project aims at designing and evaluate a combined concept for biomass and bio-energy production in OA, while considering soil bio-geo-chemical cycling of plant nutrients and biodiversity of the soil microbiota. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil biology; Biodiversity and ecosystem services; Soil quality; Air and water emissions; Farm economics; Farm nutrient management; Quality and evaluation of inputs. |
| Ano: 2008 |
URL: http://orgprints.org/15157/1/15157.pdf |
| |
|
|
| Bende-Michl, U.; Volk, M.; Harmel, D.; Newham, L.; Dalgaard, T.. |
| This short communication paper presents recommendations for developing scale-appropriate monitoring and modelling strategies to assist decision making in natural resource management (NRM). These ideas presented here were discussed in the session (S5) ‘Monitoring strategies and scale-appropriate hydrologic and biogeochemical modelling for natural resource management’ session at the 2008 International Environmental Modelling and Simulation Society conference, Barcelona, Spain. The outcomes of the session and recent international studies exemplify the need for a stronger collaboration and communication between researcher and model developer on the one side, and natural resource managers and the model users on the other side to increase knowledge in: 1)... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2011 |
URL: http://orgprints.org/18942/4/18942.pdf |
| |
|
|
| Dalgaard, T.; Halberg, N.; Porter, J.R.. |
| Knowledge about fossil energy use in agricultural systems is needed, because it can improve the understanding of how to reduce the unsustainable use of limited energy resources and the following greenhouse gas emissions. This study describes and validates a model to assess fossil energy use in Danish agriculture; gives an example of how the model can be used to compare organic and conventional farming; and discusses the implications and potentials of using the model to simulate energy use in scenarios of agricultural production. The model is a development of an existing model, which was too coarse to predict measured energy use on Danish farms. The model was validated at the field operational, thecroptype, and the national level, and can supplement the... |
| Tipo: Journal paper |
Palavras-chave: "Organics" in general. |
| Ano: 2001 |
URL: http://orgprints.org/15521/1/15521.pdf |
| |
|
|
| Dalgaard, T.; Halberg, N.; Fenger, J.. |
| Methods to investigate whether organic farming might help toreduce energy consumption and greenhouse gas emissions areneeded. The aim of this study is for the first to present anupscaling procedure, where an existing farm level energyconsumption model, in combination with the IntergovernmentalPanel on Climate Change’s guidelines, is used to calculateagricultural energy consumption and greenhouse gas emissionson the national level. Secondly, this procedure is used to simulatescenarios for conversion to organic farming in Denmark.Three scenarios for conversion to organic farming with thepresent crop yield and an expected improved future crop yieldare compared to the 1996-situation in Denmark, whereconventional farming dominates. In all scenarios, fossil... |
| Tipo: Report chapter |
Palavras-chave: Environmental aspects. |
| Ano: 2002 |
URL: http://orgprints.org/15525/1/15525.pdf |
| |
|
| |
|
|
| Dalgaard, T.; Kjeldsen, C.; Kristensen, I.T.. |
| Øget økologisk jordbrug kan, hvis omlægningen designes rigtigt, bidrage til udviklingen i landdistrikterne. Dette belyses med en række eksempler. En kortlægning af økologisk jordbrugs udbredelse i Danmark viser, at de områder, hvor der i dag er meget økologisk jordbrug, i vid udstrækning er sammenfaldende med de områder, hvor der er et særligt behov for udvikling i landdistrikterne. Det er således et vigtigt at belyse, hvorledes den økologiske jordbrugsproduktion bedst tilrettelægges, så den bidrager til landdistriktsudviklingen i disse områder. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: History of organics Landscape and recreation Biodiversity and ecosystem services Recycling; Balancing and resource management. |
| Ano: 2008 |
URL: http://orgprints.org/14805/1/14805.pdf |
| |
|
|
| Oleskowicz-Popiel, P; Ambus, P; Carter, M.S.; Dalgaard, T.; Hauggaard-Nielsen, H; Johansen, A; Jørgensen, U; Nielsen, A.M; Nielsen, H.B.; Nielsen, L.H; Olesen, J.E.; Roepstorff, A; Skytte, K; Schmidt, J.E.; Thomsen, A.B.; Thomsen, M.H.; Jensen, E.S.. |
| The research programme called “international research cooperation and organic integrity” was commenced for a period 2006-2010. It is coordinated by DARCOF (The Danish Research Centre for Organic Farming). The whole programme, with acronym DARCOF III, consists of 15 projects (http://www.darcof.dk/research/darcofiii/index.html). One of them is BIOCONCENS - Biomass and bioenergy production in organic farming – consequences for soil fertility, environment, spread of animal parasites and socio-economy (http://www.bioconcens.elr.dk/uk/). The production of bioenergy in organic agriculture (OA) can reduce its dependency of fossil fuels and decrease green house gasses emission; consequently it will increase sustainability of organic farms. Biorefinery concept based... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services Recycling; Balancing and resource management Technology assessment. |
| Ano: 2008 |
URL: http://orgprints.org/14406/1/poster_Oleskowicz%2Dpopiel.pdf |
| |
|
| |
|
|
| Pugesgaard, S.; Dalgaard, T.; Jørgensen, U.; Olesen, J.E.; Møller, H.; Jensen, E.S.. |
| Can biogas and bioethanol production make organic farming more sustainable? - Results from a model for the fossil energy balance, Nitrogen losses, and greenhouse gas emissions in a 1000 ha energy catchment with organic dairy farming and integrated biogas and bioethanol production. Dalgaard T1, Pugesgaard S1, Jørgensen U1, Olesen JE1, Møller HB1 and Jensen ES2 1) Dept. Agroecology and Environment. Faculty of Agricultural Sciences (DJF), University of Aarhus. DK-8830 Tjele. Denmark. Contact: tommy.dalgaard@agrsci.dk 2) Biosystems Department, Risø DTU, The National Laboratory for Sustainable Energy, The Technical University of Denmark DK-4000 Roskilde, Denmark The vision of organic farming systems, independent of fossil energy resources, with... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/14801/1/14801.pdf |
| |
|
|
| Halberg, N.; Dalgaard, R.; Olesen, J.E.; Dalgaard, T.. |
| Organicfarming(OF)principles include the idea of reducing dependence of fossil fuels, but little has been achieved on this objective so far in Danish OF. Energy use and green house gas (GHG)emissions from anaverage 39 ha cash crop farm were calculated and alternative crop rotations for bio-energy production were modeled. Growing rape seed on 10% of the land could produce bio-diesel to replace 50–60% of the tractor diesel used on the farm. Increasing grass-clover area to 20% of the land and using half of this yield for biogas production could change the cash crop farm to an etenergy producer, and reduce GHG emissions while reducing the overall output of products only marginally. Increasing grass-clover area would improve the nutrient management on the farm... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems; Crop husbandry. |
| Ano: 2008 |
URL: http://orgprints.org/15565/1/15565.pdf |
| |
| Registros recuperados: 14 | |
|
|
|
