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| Registros recuperados: 36 | |
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| Wang, Yaosheng; Thorup-Kristensen, Kristian; Jensen, Lars Stoumann; Magid, Jakob. |
| Rodsystemer er vigtige for planters optagelse af vand og næringsstoffer og dermed for vækst og ud-bytte, specielt under forhold med lav tilgæn- gelighed af jordens næringsstoffer. I det økologiske RDD projekt RoCo har vi undersøgt rodvækst, rodfordeling og roddybde samt rodhårs- karakteristika for forskellige sorter af vårhvede. Resultaterne af vores forsøg viser, at der er en stor variation i rod- og rodhårskarakteristika mellem forskellige vårhvedesorter, og disse er afgørende for, samt gene- tisk relateret til, afgrødens vækst og optagelse af næringsstoffer. Derfor er vital rodvækst og lange og tætte rodhår vigtige mål for selektion og fremtidig forædling af vårhvede til økologisk jordbrug. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Soil quality Nutrient turnover Breeding; Genetics and propagation. |
| Ano: 2014 |
URL: http://orgprints.org/27914/7/27914.pdf |
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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of P on organic farms in Europe using soil test results for extractable P. Data was obtained from published literature, unpublished theses, and various national and regional databases of soil test values.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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| Larsen, Thomas; Krogh, Paul Henning; Magid, Jakob; Hobbie, Erik; Marc, Ventura. |
| The study determined metabolic rates and elemental pools for two Collembola species with contrasting life histories. The fittest of the two species, P. minuta, excreted the equivalent of 10–12% of the elemental body content per day, and P. armata 7–10%. Most elements are lost to excretion (CO2 and N-waste). These figures in combination with stoichiometry and life histories indicate that the cost of P. minuta’s better fitness is a requirement for a higher quality diet than P. armata. The data produced in this study can be used to estimate the collembolan contribution to C and N fluxes in the soil. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2006 |
URL: http://orgprints.org/9257/1/9257.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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| 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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| 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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| Luxhøi, Jesper; Brøgger, Morten; Knudsen, Inge M.B.; Poulsen, Pernille H.B.; Møller, Jacob; Jensen, Birgit; Jensen, Dan F.; Magid, Jakob. |
| The aim of the research program Functional Compost is to develop and test compost, which have been enriched with chitin, for plant growth promoting properties and to recognise specific mechanisms. Two types of compost were included in the program: source separated biodegradable municipal solid waste compost (DM = 62 %) and garden and park waste compost (DM = 66 %). Chitin was added in trace amounts during the maturity phase, combined with two levels of trace amounts immediately before adding the compost to the growth medium. The research program includes several parallel experiments. In experiment I, compost (20 vol. %) was added to soil (no plants) and incubated at 15 C for 5 month, under regular determination of microbial respiration and gross and net N... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil biology; Soil quality. |
| Ano: 2006 |
URL: http://orgprints.org/9214/1/9214.pdf |
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| Magid, Jakob. |
| In the industrialised world, waste management systems have developed to maturity without primary concern for recycling. These systems have originally been designed to ensure human health and a high local hygienic standard. More recently environmental concerns have been the driving force behind a technological development of sewage treatment with biological removal of N, P and organic matter. This technology addresses some immediate problems in the aquatic environment, but the sewage sludge from the treatment plants contains considerable quantities of xenobiotic compounds and heavy metals, and only a fraction of the nutrients that entered the urban areas, thus making the sludge a non-attractive fertiliser source. In recent years there has been concern about... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Recycling; Balancing and resource management. |
| Ano: 2002 |
URL: http://orgprints.org/191/1/Hard_and_soft_JM.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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| 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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| Wang, Yaosheng; Stoumann Jensen, Lars; Magid, Jakob. |
| Sewage sludge (SS) can be used as an alternative fertilizer in agriculture. It is normally broad- casted and plowed into soil, but it is not clear if it has a potential as a placement fertilizer. A rhizo- box experiment was conducted to investigate the placement effect of SS and mineral nitrogen (N) fertilizer on shoot and root growth as well as nutrient uptake of spring wheat (Triticum aesti- vum L.). The treatments included localized SS, mixed SS, localized SS and ammonium, local- ized ammonium, and a control without addition of SS and ammonium to examine the effect of SS placement and, further, if ammonium co-localization would enhance the placement effect. The re- sults show that SS fertilization improved soil N and P availability, which significantly... |
| Tipo: Journal paper |
Palavras-chave: Composting and manuring; Nutrient turnover. |
| Ano: 2016 |
URL: http://orgprints.org/30701/1/Wang%20Localized%20application%20JPNSS%202016.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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| 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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| Sánchez‐Esteva, Sara; Gómez‐Muñoz, Beatrice; Stoumann Jensen, Lars; Neergaard, Andreas de; Magid, Jakob. |
| Background: Penicillium bilaii may enhance P availability to plants, since it has been shown to increase plant growth and P uptake. There is currently increasing interest in using microorganisms to promote P mobilisation from organic P sources. An investigation was conducted to determine the e ects of P. bilaii on P uptake and growth of wheat in the presence and absence of sewage sludge. Two soils di ering in P contents and pH were used, as it was hypothesised that these a ect the e ciency of P mobilisation. Methods: A pot experiment, in which wheat was grown for 35 days in a moderately acidic soil of low P status and a calcareous soil of moderate P status, was conducted. A full factorial design was used with two non‐sterilised soils, three amendments... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Nutrient turnover. |
| Ano: 2016 |
URL: http://orgprints.org/30704/1/Sanches%20CBTA%202016.pdf |
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| Registros recuperados: 36 | |
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