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| Registros recuperados: 44 | |
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| Langer, Vibeke. |
| Ni frøavlere og lige så mange frugtavlere har i løbet af sommeren vandret deres bedrifter tynde for at registrere blomster og kortlægge redepladser for de vilde bier. Deres registreringer skal bruges til at udvikle et nyt redskab, der kan bruges til at skabe bedre leveforhold for bierne. Der er almindelig enighed om, at de vilde bier har det svært i det intensivt dyrkede danske landbrugslandskab. Selv på økologiske bedrifter, hvor de ikke er udsat for pesticider, kan de mangle føde- og redesteder, og kun den enkelte landmand eller frugtavler kan ændre på situationen. Derfor har vi i forskningsprojektet BEEFARM sat os for at udvikle et værktøj, som landmanden kan bruge til at vurdere leveforholdene for vilde bier på bedriften. Ni økologiske... |
| Tipo: Newspaper or magazine article |
Palavras-chave: "Organics" in general. |
| Ano: 2015 |
URL: http://orgprints.org/29448/1/29448.pdf |
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| Rasmussen, Jesper; Langer, Vibeke; Alrøe, Hugo Fjelsted. |
| An analysis of peer reviews of 84 organic farming grant applications, submitted to The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS) in 2001 was carried out to investigate whether peer reviews were influenced by the peer reviewers’ affiliation to organic agriculture research and to what degree peer reviewers distinguish between scientific quality and societal relevance. Fifteen reviewers were grouped in three groups (1) scientists with affiliation to organic farming research, (2) scientists without affiliation to organic farming research and (3) users of the research. The scientist groups assessed societal relevance of the grant applications and scientific quality as a sum of three scientific criteria and the... |
| Tipo: Journal paper |
Palavras-chave: Research methodology and philosophy; Research communication and quality. |
| Ano: 2006 |
URL: http://orgprints.org/3087/1/Bias_in_peer_review.pdf |
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| Langer, Vibeke. |
| Wild bees (bumblebees and solitary bees) are two important groups of wild pollinators in temperate zones, delivering pollination services to crops and wild plants. It is well documented that wild bees are declining nationally and regionally in Europe (Biesmeijer et al., 2006) threatening crop pollination estimated to 14 mia. euro/year. Wild bees are dependent on presence of high quality flower resources and on suitable nesting and overwintering sites locally (Strandberg et al., 2011). In the agricultural landscape, availability of these resources depend on land use, i.e. distribution between arable land and uncropped areas, crop distribution and management as well as quantity and quality of permanent grasslands, hedgerows, road verges, etc. Although... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2014 |
URL: http://orgprints.org/24378/1/24378_Henriksen_MM.pdf |
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| Langer, Vibeke. |
| Compared with conventional farms, organic farms are expected to be more diverse, less specialized and less intensive, and organic farms as a group are expected to contribute to a more uniform regional distribution of farm types. Data on farm size, crop distribution and livestock intensity prior to conversion and planned after conversion on 448 Danish farms, which began conversion to organic farming in 1997, are presented in adressing two questions: 1) what features characterize Danish farms that convert from conventional to organic farming ?, 2) what do the farms convert to: do farm types, stocking rates and crop distribution change with conversion ? In 1997, dairy farms dominated among the converting farms in acreage, and a large majority (80-97%) of the... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Production systems; Farming Systems. |
| Ano: 2002 |
URL: http://orgprints.org/1015/1/Langer_Farm_changes_til_e-prints.doc |
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| Frederiksen, Pia; Langer, Vibeke. |
| Density and management of landscape elements on organic farms were investigated for 345 organic farms in Denmark in 2001, representing approximately 10% of the total number of organic farms. The density of hedgerows, area habitats and ponds was estimated and related to various aspects of farm character, such as size, type and lifestyle/part time/full time farms, as well as region and biophysical context. A large variation in the densities was found, the highest densities were found on the smallest farms. Farm size was the farm parameter that was closest related to the density of landscape elements as well as landscape structural variables. Farm size was related to the other farm characteristics. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Landscape and recreation; Biodiversity and ecosystem services. |
| Ano: 2005 |
URL: http://orgprints.org/5812/1/5812.pdf |
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| Langer, Vibeke; Frederiksen, Pia. |
| Diversity is a key concept of organic agriculture and is intuitively perceived as having positive, but not always explicit, consequences for the internal functioning of the farm as well as for the impact on environment and farmland nature. In two groups of specialised organic farms (arable and dairy) and a group of mixed farms, links between production diversity and diversity at the scales above and below, as well as relations to potential farmland biodiversity, are examined. Results show that diversity in different scales are not consistently correlated, i.e. neither high diversity in farm household on-farm activities, nor diversity in agricultural production are linked to high crop and land use diversity. Furthermore, there are no simple relations... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2008 |
URL: http://orgprints.org/12580/1/12580.pdf |
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| Liu, Yuexian; Langer, Vibeke; Høgh-Jensen, Henning; Egelyng, Henrik. |
| The objective of this study was to evaluate the differences in the energy consumption between the production of certified organic pear, green food certified pear, and conventional pear in two areas in China. Data were collected from interviews with farmers during 2007 and 2008. Energy inputs were significantly higher in organic systems compared with conventional and green systems. Fertilizer was the most important contributor to energy consumption in all three farming systems. Three calculation methods for energy value of manure have been found in the literature: substitution method, by-product method, and thermal method. The choise of various calculation methods for estimating the energy value of manure turns out to have great influence on the results in... |
| Tipo: Journal paper |
Palavras-chave: Environmental aspects. |
| Ano: 2010 |
URL: http://orgprints.org/18297/1/18297.pdf |
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| Langer, Vibeke; Rohde, Benjamin. |
| Factors reducing yield of organic white clover seed production were investigated in Denmark. In thirty-six fields from different regions, density of flower heads and their area, and weevils of the genera Apion and Hypera, hatching from flower heads, were assessed. In fifteen of these fields, additional measurements were made in order to calculate potential yield and yieldreducing factors. Flower heads had a mean of ninetytwo florets per head, of which proportionately 0,59 were intact, 0,08 were not pollinated and 0,34 damaged by weevils; 0,16 of the florets contained larvae of Apion species. In intact florets the mean number of seeds was 3,6. Density and size of flower heads were correlated with low density of flower heads leading to significantly more... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2005 |
URL: http://orgprints.org/4788/1/4788.pdf |
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| Frederiksen, Pia; Langer, Vibeke. |
| Noten er et sammendrag af resultater fra delprojektet "Localisation of organic farms" under Nature Quality in organic farming. Det vises at mens hovedparten af de danske økologiske bedrifter er specialiserede, er der i Jylland antalsmæssigt ikke tale om en voldsom specialisering, mens Fyn og Sjælland er stærkt domineret af planteavlere. Koncentration og spredningsmønstre vises for 1994 og 2001, og der konstateres en tendens til lokal spredning. |
| Tipo: Other |
Palavras-chave: "Organics" in general; History of organics; Denmark. |
| Ano: 2004 |
URL: http://orgprints.org/3319/1/3319.doc |
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| Langer, Vibeke. |
| Frø- og frugtavlere er særlig afhængige af de vilde bier. Vilde bier øger udbyttet, fordi de sammen med biavlernes honningbier sørger for bestøvning i landbruget. Men de vilde bier er i tilbagegang. Det betyder ikke blot forringet dyrkningssikkerhed for frøafgrøder og frugtkulturer, men også at bestøvningen af vilde planter og dermed biodiversiteten svækkes. Tidligere er bestøvningen fra de vilde bier blevet set som en udbytteforsikring, hvis honningbierne af en eller anden grund ikke fungerede godt. Fornylig er det imidlertid vist, at de vilde bier på bedriften kan øge udbyttet selv med velfungerende honningbier, og derfor er det vigtigt, at man som landmand sikrer de bedst mulige forhold for de vilde bier. |
| Tipo: Newspaper or magazine article |
Palavras-chave: "Organics" in general. |
| Ano: 2014 |
URL: http://orgprints.org/27881/1/27881.pdf |
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| Registros recuperados: 44 | |
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