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| Registros recuperados: 36 | |
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| 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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| Oelofse, Myles; Jensen, Lars Stoumann; Magid, Jakob. |
| Soil fertility management in organic sys- tems, regulated by the organic standards, should seek to build healthy, fertile soils and reduce reliance on external inputs. The use of nutrients from conventional sources, such as animal manures from conventional farms, is currently permitted, with restrictions, in the organic regulations. However, the reliance of organic agriculture on the conventional system is considered problematic. In light of this, the organic sector in Denmark has recently decided to gradually phase out, and ultimately ban, the use of conventional ma- nures and straws in organic agriculture in Denmark. Core focal areas for phasing out conventional nutrients are as follows: (1) amendments to crop selection and rotations, (2) alternative... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Recycling; Balancing and resource management Nutrient turnover Farm nutrient management History of organics. |
| Ano: 2013 |
URL: http://orgprints.org/27911/1/Myles%20Phasing%20out%20implications%20personal%20copy%202013.pdf |
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| Oelofse, Myles; Jensen, Lars Stoumann; Magid, Jakob. |
| Soil fertility management in organic systems, regulated by the organic standards, should seek to build healthy, fertile soils and reduce reliance on external inputs. The use of nutrients from conventional sources, such as animal manures from conventional farms, is currently permitted, with restrictions, in the organic regulations. However, the reliance of organic agriculture on the conventional system is considered problematic. In light of this, the organic sector in Denmark has recently decided to phase out, and ultimately ban, the use of conventional manures and straws in organic agriculture in Denmark by 2021. Core focal areas for phasing out conventional nutrients are 1) amendments to crop selection and rotations, 2) alternative nutrient sources... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Composting and manuring Recycling; Balancing and resource management Nutrient turnover Farm nutrient management Quality and evaluation of inputs. |
| Ano: 2011 |
URL: http://orgprints.org/19839/3/19839.pdf |
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| Wang, Yaosheng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
| Background and Aims A number of root and root hair traits have been proposed as important for acquisition of P. However, it remains unknown whether these traits are most important in determining macro- and micronutrient uptake at low soil fertility. This study investigated the variations in root and root hair traits among spring wheat genotypes and examined which root and root hair traits are most important for high uptake of macro- and micronutrients. Methods Six spring wheat genotypes were grown in a soil with low nutrient availability. The root and root hair traits as well as the content of macro- and micronutrients were identified. Results A significant genetic variability in root and root hair traits was found. High root growth vigour and long and... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Composting and manuring Breeding; Genetics and propagation. |
| Ano: 2014 |
URL: http://orgprints.org/27912/8/27912.pdf |
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| Bruun, Sander; Hansen, Trine L.; Christensen, Thomas H.; Magid, Jakob; Jensen, Lars S.. |
| Source separation, composting and anaerobic digestion, with associated land application, are increasingly being considered as alternative waste management strategies to landfilling and incineration of municipal solid waste (MSW). Environmental life cycle assessments are a useful tool in political decision-making about waste management strategies. However, due to the diversity of processed organic MSW and the situations in which it can be applied, the environmental impacts of land application are very hard to determine by experimental means. In the current study, we used the agroecosystem model Daisy to simulate a range of different scenarios representing different geographical areas, farm and soil types under Danish conditions and legislation. Generally,... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil quality. |
| Ano: 2006 |
URL: http://orgprints.org/9223/1/9223.pdf |
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| Cooper, Julia; Loes, Anne-Kristin; Hörtenhuber, Stefan; Mäder, Paul; Magid, Jakob; Oberson, Astrid; Möller, Kurt. |
| Organic farming standards regulate allowable nutrient inputs according to the core principles of: reliance on renewable resources, recycling of wastes and by-products of plant and animal origin, and feeding of plants through the soil ecosystem and not through soluble fertilizers, balanced against a goal to produce high quality products with a minimum level of contaminants. These criteria are applied to the list of currently permitted inputs in organic agriculture, known as "Annex 1" of the European Commission Regulation EC No. 889/2008. This list currently excludes some potentially useful sources of societal waste (e.g. some sources of household waste and digestate, sewage sludge), but allows other sources which may pose higher risks according to some... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management Values; Standards and certification Policy environments and social economy Farm nutrient management. |
| Ano: 2016 |
URL: http://orgprints.org/30544/2/Cooper%20poster%20ESA%202016.pptx |
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| Cooper, Julia; Reed, Eleanor Y.; Hörtenhuber, Stefan Josef; Lindenthal, Thomas; Løes, Anne-Kristin; Mäder, Paul; Magid, Jakob; Oberson, Astrid; Kolbe, Hartmut; Möller, Kurt. |
| Maintaining sufficient soil phosphorus (P) levels for non-limiting crop growth is challenging in organic systems since off-farm inputs of P are restricted. This study assessed the status of P on organic farms in Europe using soil test results for extractable P. Data was obtained from published literature, unpublished theses, and various national and regional databases of soil test values. Most of the data (15,506 observations) came from field scale soil tests, but in some cases (1272 observations) values had been averaged across a farm. Farm scale and field scale data were analysed separately and the impact of farm type (arable, dairy, grassland, horticulture, mixed, poultry, unknown) was assessed. Soil test results were assigned to P classes from very low... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Nutrient turnover; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/32707/1/Cooper%20et%20al%202017%20NCAES.pdf |
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| Wang, Yaosheng; Andersen, Sven Bode; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
| Root and root hairs of plants have been intensively studied in solution culture; however, correlation of such measurements in solution culture with development in soil is poorly understood. This study compared growth of roots and root hairs as well as uptake of macro- and micronutrients of six spring wheat varieties in solution culture under P stress and P abundance and in a low fertility soil. Results showed that root length and surface area under P stress was significantly positively correlated with that in the low fertility soil, while no such correlation was apparent for root hair length and density. In absolute terms the root length, surface area, root hair length and density of spring wheat varieties were substantially higher in soil than in solution... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Breeding; Genetics and propagation. |
| Ano: 2014 |
URL: http://orgprints.org/27913/3/27913.pdf |
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| Oelofse, Myles; Jensen, L.S.; Magid, Jakob. |
| Soil fertility management in organic systems, regulated by the organic standards, should seek to build healthy, fertile soils and reduce reliance on external inputs. The use of nutrients from conventional sources, such as animal manures from conventional farms, is currently permitted, with restrictions, in the organic regulations. However, the reliance of organic agriculture on the conventional system is considered problematic. In light of this, the organic sector in Denmark has recently decided to gradually phase out, and ultimately ban, the use of conventional manures and straws in organic agriculture in Denmark. Core focal areas for phasing out conventional nutrients are as follows: (1) amendments to crop selection and rotations, (2) alternative... |
| Tipo: Journal paper |
Palavras-chave: Soil quality Nutrient turnover Soil Values; Standards and certification Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/24655/1/Oelofse_et_al_Journal%20of%20Organic%20Agriculture.pdf |
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| Lemming, Camilla; Oberson, Astrid; Hund, Andreas; Stoumann Jensen, Lars; Magid, Jakob. |
| Background: Phosphorus recycling from waste and localised placement of fertilisers can be means to improve sustainable P management in agriculture. However, knowledge about root and plant P uptake responses to placement of complex waste- derived fertilisers is lacking. Methods: Sewage sludge (SS) and sewage sludge ash (ASH) were tested against triple superphosphate (TSP) in a rhizobox setup where shoot and root growth of maize was followed for 30 days. The three P sources were either mixed homogenously into the soil (labelled with 33P) or localised in a patch close to the seed. Results: While localised TSP and SS both increased root length density around the fertiliser patch, it was at the expense of the remaining root system and soil P uptake for SS.... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2015 |
URL: http://orgprints.org/29273/7/29273.pdf |
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| Lang, Isabella; Tamm, Lucius; Speiser, Bernhard; Schärer, Hans-Jakob; Herforth-Rahmé, Joelle; Walkenhorst, Michael; Bünemann-König, Else; Maurer, Veronika; Moeskops, Bram; Busacca, Emanuele; Gall, Eric; Magid, Jakob; Schmitt, Annegret. |
| The plant and animal health care strategy in organic farming strengthensagro-biodiversity, protects the environment as well as animal and human health. In addition to fully exploiting preventive options, the use of external inputs such as plant protection products, fertilisers or veterinarymedicinal productsis allowed to prevent inacceptable losses in productivity or animal suffering. However, external inputs need to comply with organic standardsas well as European legislationand aretherefore carefully evaluated before any decision on acceptance is taken.Organic farming systems should aim at reducing dependency on off-farm fertilisers to the lowest feasable level to ensure closed nutrient cycles and avoid nutrient leakage and contamination. This policy... |
| Tipo: Report |
Palavras-chave: Evaluation of inputs. |
| Ano: 2019 |
URL: http://orgprints.org/36499/1/ifoameu_projects_relacs_policy_brief_on_organic_inputs_201909.pdf |
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| Magid, Jakob; Rasmussen, Lasse Dam; Moeller, Jacob. |
| The experiments show that composting of GM plant residues greatly increases the rate of degradation of transgenic DNA compared to the rate for plant residues left in the soil. If the persistence of transgenic DNA in the environments is considered as the only risk factor, composting is a 'DNA-safe' method to treat GM plant residues. However, even though transgenic plant DNA was not detected in bacterial isolates in our experiments, we cannot conclude that horizontal gene transfer can not take place. The 300 isolates tested proved to be too low a number to be conclusive. The numbers of isolates tested were based on the screenings indicating high transfer, but the screenings were biased apparently because some Bacillus species gave PCR products matching the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2004 |
URL: http://orgprints.org/3622/1/3622.pdf |
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| Magid, Jakob. |
| The overall objective of the Short-Circuit project was to promote the waste recycling concept using three sub-systems, i.e. collection of vegetable residues from the box scheme business Aarstiderne A/S and composting the residues at Krogerup farm, on-farm composting of urban waste at an experimental farm belonging to KVL and a community involved combined biogas production and composting system developed by Solum A/S. Data from the optimised systems formed the basis of a Life Cycle Analysis (ecotoxicology not included) to evaluate environmental impact. This was done by KTH using the ORWARE waste management model. All systems performed very well and lived up to the specifications put down in the project application and it was demonstrated that the... |
| Tipo: Report |
Palavras-chave: "Organics" in general. |
| Ano: 2006 |
URL: http://orgprints.org/9230/1/9230.doc |
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| Registros recuperados: 36 | |
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