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Registros recuperados: 20
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A model simulation analyses of nitrate leaching – does soil organic matter pool structure or catch crop growth parameters matter most? Organic Eprints
Pedersen, Anders; Petersen, Bjørn Molt; Eriksen, Jørgen; Hansen, Søren; Jensen, Lars Stoumann.
Modelling of soil organic matter (SOM) turnover has often been developed in order to or to predict crop fertilser demand or to analyse environmental impact of different agriculture management practices. Mechanistic simulation models can be used to predict the mineralization of nitrogen (N) in added organic matter, e.g. from animal manure or incorporated crop residues, and the timing of N availability to the succeeding crops. In this way, mechanistic models may be used to avoid excessive fertilisation and hence to minimise nitrate leaching. The objective of this work was therefore to analyse the consequences of applying different SOM and crop modules (differing in pool structure or parameterisation) in the soil-plant-atmosphere model Daisy on the simulated...
Tipo: Journal paper Palavras-chave: Nutrient turnover Crop combinations and interactions Recycling; Balancing and resource management Air and water emissions.
Ano: 2007 URL: http://orgprints.org/4622/2/4622.pdf
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Catch crops have little effect on P and K availability of depleted soils Organic Eprints
Jensen, Lars Stoumann; Pedersen, Anders; Magid, Jakob; Nielsen, Niels Erik.
It is a well-known fact that catch crops have a significant effect on availability and loss of soil inorganic nitrogen (Thorup-Kristensen et al., 2003) and recently marked effects on soil inorganic sulphur dynamics have also been shown (Eriksen and Thorup-Kristensen 2002; Eriksen et al., 2004). However, we know much less about the effect of catch crops on phosphorous (P) and potassium (K) mobilisation and availability for the next crop. After several years of organic cash crop production, e.g. vegetables and cereals, yield levels may gradually be limited by soil P and K availability, depending on the initial status at conversion to organic production principles. This is particularly the case during the establishment phase of certain vegetable cultures...
Tipo: Journal paper Palavras-chave: Nutrient turnover Farm nutrient management Recycling; Balancing and resource management Air and water emissions.
Ano: 2005 URL: http://orgprints.org/6165/1/6165.pdf
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Complementary root systems in organic intercropping of vegetables Organic Eprints
Xie, Yue; Kristensen, Hanne L..
The deep root system of the intercrop dyers woad complemented the shallow root system of leek without jeopardizing leek yields. These results show perspectives for reduction of nitrate leaching from leek production.
Tipo: Conference paper, poster, etc. Palavras-chave: Crop combinations and interactions Recycling; Balancing and resource management Air and water emissions.
Ano: 2013 URL: http://orgprints.org/28394/7/28394.pdf
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Efterafgrøder har ringe effekt på P og K forsyningen på udpint lerjord Organic Eprints
Jensen, Lars Stoumann; Pedersen, Anders; Magid, Jakob; Nielsen, Niels Erik.
Efterafgrøder påvirker jordens tilgængelighed og tab af kvælstof (N). Dette er velkendt i økologiske sædskifter. Derimod ved vi mindre om, hvordan efterafgrøderne virker på tilgængeligheden af fosfor (P) og kalium (K) og på forsyning til den næste afgrøde i sædskiftet. Afhængig af jordens næringsstof status ved omlægning, vil økologisk produktion af salgsafgrøder med tiden kunne begrænses af næringsstofmangel, hvis der ikke tilføres P eller K. Denne mangel på næringsstoffer gælder ikke mindst i afgrødernes etableringsfase og for en række grøntsagskulturer med et lille rodsystem. Når efterafgrøder kan bruges til at 'flytte rundt' på tilgængeligt N i sædskiftet, har man ofte i det økologiske jordbrug spekuleret over om det også kunne lade sig gøre for P...
Tipo: Journal paper Palavras-chave: Nutrient turnover Farm nutrient management Recycling; Balancing and resource management Air and water emissions.
Ano: 2005 URL: http://orgprints.org/6166/1/6166.pdf
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Elemental composition and phosphorus availability in hydrochars from seaweed and organic waste digestate Organic Eprints
Løes, Anne-Kristin; Sandquist, Judit; Meyer, Gregor.
By hydrothermal liquefaction (HTL) of organic matter, hydrochars are produced which may be applied to soil for carbon sequestration. From substrates of wild seaweed and organic waste digestate, we measured the distribution of solids (hydrochars) and liquids after HTL at 150 and 200°C, 50 bar for 1 h. The output of liquids and solids was recorded. Elemental analysis was conducted for essential plant nutrients, potentially toxic elements (PTEs) and silicon in the hydrochars. Sequential extraction of phosphorous (P) was conducted to assess the P availability for plants. About 20% of the initial dry matter dissolved during HTL of digestate, and 55% for seaweed. More dry matter was dissolved by increased temperature. Except from arsenic in seaweed chars, the...
Tipo: Journal paper Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2017 URL: http://orgprints.org/32705/1/Loees%20et%20al%20printed%20Acta%20August%202017.pdf
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Energy and environmental burdens of organic and non-organic agriculture and horticulture Organic Eprints
Williams, A G; Audsley, E; Sandars, D L.
Production of 10 major commodities in England and Wales was studied using Life Cycle Analysis (LCA). Organic and non-organic (contemporary conventional) systems were compared. Organic production was generally less energy consuming, except for poultry meat, eggs and tomatoes. Environmental burdens, such as global warming potential or eutrophication were often greater per unit of production from organic than non-organic systems.
Tipo: Conference paper, poster, etc. Palavras-chave: Farm nutrient management Biodiversity and ecosystem services Recycling; Balancing and resource management Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10160/1/Energy_and_environmental_burdens_of_organic_and_non%2Dorganic_agriculture_and_horticulture.pdf
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EU Ecolabel for food and feed products – feasibility study Organic Eprints
Sengstschmid, Helmut; Sprong, Niels; Schmid, Otto; Stockenbrand, Nina; Stolz, Hanna; Spiller, Achim.
The environmental impacts of the production and processing of food, feed and drinks make up between 20% and 30% of the total environmental impacts of consumable goods in the EU. In the case of eutrophication (the accumulation of nutrients in water causing a reduction in oxygen availability) they account for as much as 58% of the total impacts. The EU Ecolabel is a voluntary scheme that forms part of overall EU policy to encourage more sustainable consumption and production. To date, the EU Ecolabel scheme has developed criteria for products in the non-food sector. The Regulation that governs the scheme (66/2010) aims to extend the EU Ecolabel into new product categories including food. However, the Regulation stipulates that before extending to the food...
Tipo: Report Palavras-chave: Technology assessment Recycling; Balancing and resource management Air and water emissions.
Ano: 2011 URL: http://orgprints.org/20232/1/Ecolabel_for_food_final_report.pdf
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Farming systems comparison study, Bioforsk Arable Crops Division, Apelsvoll Organic Eprints
A long-term farming systems comparison study was initiated at Bioforsk Arable Crops Division, Apelsvoll, in 1989. The aim was to compare on a model farm level differences in yields, nutrient runoff, nutrient balances and economical results for conventional, integrated and organic dairy and cash crop farming systems. The vision of the project was to develop farming systems that minimized the runoff of nutrients and pesticide residues, produced healthy crops with optimal nutritional value, and gave satisfying yields and economic results. In 2000, the system was changed so that the term “integrated” was replaced by “optimal”, defined as the treatment that achieves the maximum yield per kilo leached nitrogen. The study comprises a field lysimeter with 12...
Tipo: Research facility description Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Farming Systems Dairy cattle Farm nutrient management Recycling; Balancing and resource management Air and water emissions.
Ano: 2020 URL: http://orgprints.org/7056/1/Korsaeth.pdf
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Fødevarernes andel af klimabelastningen Organic Eprints
Olesen, Jørgen Eivind.
Produktion og forbrug af fødevarer er ansvarlig for et betydeligt bidrag til de globale udslip af driv-husgasser. Udslippene skyldes direkte udledninger af drivhusgasserne metan (CH4) og lattergas (N2O) i forbindelse med produktionen. Disse drivhusgasser har henholdsvis 21 og 310 gange krafti-gere drivhuseffekt end CO2. Drøvtyggernes fordøjelse er den største enkeltkilde til metan udled-ning, desuden kommer der metan fra gødningslagrene. Lattergas dannes, når kvælstof omdannes ved mikrobielle processer i jorden. Derfor øges udslippet af lattergas, når jorden tilføres kvælstof-gødninger. Landbruget har endvidere et energiforbrug (direkte og indirekte), som også bidrager til udledning af CO2.
Tipo: Report chapter Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2010 URL: http://orgprints.org/18507/1/18507.pdf
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Følgeforskning Sterner sitt anlegg på Smøla settefisk - masse- og energibalanser, økonomi og klimanytte Organic Eprints
Kvande, Ingvar; Cabell, Joshua; Stensgård, Aina Elstad; Saxegård, Simon; Morken, John.
Smøla Klekkeri og Settefisk AS klekker yngel og forer fram settefisk. På grunn av en begrenset vannressurs bygde de et av de første resirkulerings-anleggene (RAS – recirculating aquaculture systems) i Norge. Fra og med 2013 har de i samarbeid med Biotek, senere Biotek Sterner og nå Sterner de utviklet et biogassanlegg som kan håndtere rent fiskeslam. Hovedmotivasjonen for bygging av et slikt anlegg har vært å oppfylle myndighetenes krav på 50 % reduksjon i innholdet av partikulært materiale. Man har i tillegg sett på muligheten for utnyttelse av gassen for å dekke egne energibehov. Basert på anlegget på Smøla har Sterner Biotek valgt å kommersialisere teknologien og har bygd et anlegg som er 7 ganger større enn det på Smøla for Cermaq Norway AS, avd....
Tipo: Report Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2018
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Indicator systems - resource use in organic systems Organic Eprints
Topp, C F E; Watson, C A; Rees, R M; Stockdale, E A.
A balanced use of resources within organic farming systems is required to maintain sustainable systems. Hence, it is essential to have tools that can assess the use of resources within the farming system and their impact on the environment. The range of tools that have been developed include those assessing local farm-scale issues together with those that assess impacts at the global scale. At the global scale assessments are usually made on the basis of a unit of product whereas at the local scale assessments can also be made on an area basis. In addition, the tools also assess a variety of issues, e.g. biodiversity, pollution potential, energy and water use. The level of detail required for the different assessment tools differs substantially;...
Tipo: Conference paper, poster, etc. Palavras-chave: Environmental aspects Production systems Production systems Recycling; Balancing and resource management Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10162/1/Energy_and_environmental_burdens_of_organic_and_non%2Dorganic_agriculture_and_horticulture.pdf
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Influence of catch crops on phosphorous and potassium availability in a depleted loamy soil Organic Eprints
Jensen, Lars Stoumann; Pedersen, Anders; Magid, Jakob; Nielsen, Niels Erik.
Although catch crops and green manures are known to greatly influence nitrogen loss and availability for the succeeding crop, an experiment with catch crops and green manures on a long-term nutrient depletion trial showed no ability to mobilize phosphorous and potassium resources on this low fertility site. The study reported here indicated that this may be due to the limited biomass productivity of catch crops on such low fertility soils.
Tipo: Journal paper Palavras-chave: Nutrient turnover Farm nutrient management Recycling; Balancing and resource management Air and water emissions.
Ano: 2006 URL: http://orgprints.org/7871/1/7871.pdf
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Klimabelastningen fra økologisk landbrug - hvad kan der gøres Organic Eprints
Olesen, Jørgen E..
Klimaændringer er uden tvivl en af de største udfordringer menneskeheden har stået over for. Det skyldes ikke mindst de enorme konsekvenser, som klimaændringerne vil have for verdens økosystemer og for vore levevilkår. I det politiske liv tales ofte om at undgå farlige klimaændringer. Hvad der er farligt er jo en politisk beslutning, hvorimod det er op til forskningen at fremlægge dokumentation for de konsekvenser forskellig grader af klimaændringer vil have. EU har defineret at det drejer sig om at undgå klimaændringer, der overstiger 2 grader i global middeltemperatur over førindustrielt niveau, og denne målsætning er på det seneste tiltrådt af G8 landene.
Tipo: Report chapter Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2009 URL: http://orgprints.org/27481/7/27481.pdf
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Life cycle assessment of Swiss organic farming systems Organic Eprints
Nemecek, T; Dubois, D; Huguenin-Elie, O; Gaillard, G.
The impacts of organic and integrated farming systems in Switzerland on the environment have been assessed in a comprehensive study by the life cycle assessment method. This paper reports a comparison of the treatments of the DOC experiment. Organic farming showed clear ecological advantages particularly for eco- and human toxicity, resource use and biodiversity. These ecological advantages only partly apply to nutrient losses and are not always found for single products. Per kg of organic product, higher impacts were often found for global warming potential, ozone formation, eutrophication and acidification compared to integrated production. In the same crop rotation with the same amount of organic fertilisers there were no systematic differences in soil...
Tipo: Conference paper, poster, etc. Palavras-chave: Quality and evaluation of inputs Farm nutrient management Biodiversity and ecosystem services Crop husbandry Recycling; Balancing and resource management Air and water emissions.
Ano: 2006 URL: http://orgprints.org/10157/1/Life_cycle_assessment_of_Swiss_organic_farming_systems.pdf
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Mit Biostrom gegen den Strom Organic Eprints
Schiess, Christophe; Schädeli, Alfred.
Wasser, Wind und Sonne werden auf Biohöfen zur Gewinnung von Strom genutzt. Damit schwimmen sie gegen den Strom und setzen einen dezentralen ökologischen Kontrapunkt zum zentralisierten grossen Strommarkt. Der diesjährige Marché Bio in Saignelégier stellt die Strompioniere ins Zentrum und läuft zu 100 Prozent mit Strom von Biohöfen aus dem Jura.
Tipo: Newspaper or magazine article Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2005 URL: http://orgprints.org/28460/1/Artikel_Sch%C3%A4deli_4_7.pdf
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Monitoring and management of energy and emissions in agriculture Organic Eprints
Little, Tony.
This review collates the results of research into energy use and emissions in organic farming, and provides advisers with an analysis of the results, access to the data used and a review of the benchmarking methodologies available. The review will inform those working in the development of benchmarking tools and advising farmers on practices to improve their performance.
Tipo: Other Palavras-chave: Recycling; Balancing and resource management Air and water emissions.
Ano: 2007 URL: http://orgprints.org/5596/1/Res_review_6_little.doc
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Musselmjöl - nytt miljövänligt fodermedel Organic Eprints
Wahlberg, Carolina.
Mussel meal is produced in a pilot plant near Gothenburg in Sweden. Mussels filter sea water, and can thus recycle nitrogen and phosphorus from effluents. Instead of being a waste, surplus mussels from mussel producers can be converted into protein feed for animals. Mussel meal has already proved to have a high feeding value for poultry. Now mussel meal will be tested as a feed for growing-finishing pigs, within the CoreOrganic-funded research project ICOPP.
Tipo: Newspaper or magazine article Palavras-chave: Feeding and growth Recycling; Balancing and resource management Air and water emissions.
Ano: 2012 URL: http://orgprints.org/24651/1/24651.PDF
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Nitrogen Utilization in Integrated Crop and Animal Production Organic Eprints
Seuri, Pentti.
The principles of organic production are based on integration between crop and animal production and self-regulated nutrient intensity. A comparison between specialized dairy and crop farm models and an integrated dairy and crop farm model showed 24 % higher total production per area and higher nitrogen utilization in the integrated system. The main factors were more efficient nutrient circulation, better utilization of legume crops and low intensity of nitrogen on non-legume crops.
Tipo: Conference paper, poster, etc. Palavras-chave: Farm nutrient management Recycling; Balancing and resource management Air and water emissions.
Ano: 2008 URL: http://orgprints.org/12304/1/Seuri_12304_rev.doc
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Urban nutrient balance for Bankok Organic Eprints
Færge, Jens; Magid, Jakob; de Vries, Fritz Pennig.
To enhance agricultural sustainability, former linkages between agriculture and urban waste production should be reintroduced. Therefore, to explore the options for recycling of nutrients from mega-cities, a nutrient balance model was developed. The parameterization were established for the Bangkok Province and considers nitrogen (N) and phosphorous (P). To model the food supply, an online database (FAOSTAT) estimating supply at country levels, was employed. It is argued that desaggregation to urban level is reasonable after adjustments for different economy in Bangkok than the average in Thailand. The balance shows that only a small fraction of nutrients are recovered, currently about 7 and 12% respectively, of the amount of N and P in the total food...
Tipo: Journal paper Palavras-chave: "Organics" in general Recycling; Balancing and resource management Air and water emissions.
Ano: 2001 URL: http://orgprints.org/190/1/190.pdf
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Wasserschutz im Ökologischen Landbau: Leitfaden für Land- und Wasserwirtschaft Organic Eprints
Mit dem Projekt wird der wissenschaftliche Sachstand eines gewässerschonenden Ökologischen Landbaus in Wissenschaft, Beratung und Praxis aufgearbeitet. Die grundlegenden Zusammenhänge zwischen Landnutzung und Gewässerqualität werden dargestellt. Klar verständlich und anschaulich ausgearbeitet werden die im Ökologischen Landbau praxisgerechten und gewässerverträglichen Strategien, Konzepte und Maßnahmen einer weitestgehenden Reduzierung oder Vermeidung von Nitratausträgen und weiteren Stoffbelastungen. Der zu erarbeitende Leitfaden und die zugehörige Foliensammlung werden eine aktuelle und belastbare Grundlage für die Wissensvermittlung bilden und die Verbreitung praxisorientierter Lösungen ermöglichen. Mit der standortangepaßten Ausrichtung der...
Tipo: Project description Palavras-chave: Nutrient turnover Crop combinations and interactions Recycling; Balancing and resource management Air and water emissions.
Ano: 2020
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