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| Registros recuperados: 11 | |
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| 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 |
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| Petersen, B.M.; Berntsen, J.; Kristensen, I.S.; Olesen, J.E.. |
| I forbindelse med den faglige evaluering forud for Vandmiljøplan II (VMP II) blev det anslået, at økologisk jordbrug i gennemsnit reducerede udvaskningen med 10 kg kvælstof (N) per ha. Det fremgik, at dette tal var behæftet med stor usikkerhed. Da der i forbindelse med genberegning af udvaskningsniveauet fra dansk landbrug i 2002 skete en opjustering af det generelle udvaskningsniveau før VMP II, vurderedes dette ikke at skulle ske for økologisk jordbrug. Forskellen i nitratudvaskning mellem økologiske og konventionelle arealer blev derfor revurderet til at være 28 kg N per ha.DJF har nu genanalyseret forskellene mellem økologiske og konventionelle planteavlsbrug for repræsentative sædskifter, driftsledelser og gødningsimport (Berntsen et al., 2004).... |
| Tipo: Journal paper |
Palavras-chave: Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/4663/1/4663.PDF |
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| Berntsen, J.; Petersen, B.M.; Kristensen, I.S.; Olesen, J.E.. |
| Med udgangspunkt i regnskabsdata fra Fødevareøkonomisk Institut (FØI) og data fra Centrale Registre (CR) blev importen af kvælstof (N) i gødning til marken til konventionelle og økologiske planteavlere estimeret til hhv. 129 og 51 kg N ha-1 år-1. Desuden blev der med udgangspunkt i den aktuelle afgrødefordeling opstillet et generelt sædskifte for hver af de to systemer. Det opstillede sædskifte for den økologiske planteavl havde en høj andel af vårsæd og desuden 20% kløvergræs, mens den konventionelle planteavl var domineret af kornafgrøder primært i form af vintersæd. Med baggrund i disse model-sædskifter blev N-balancen på markniveau beregnet ved anvendelse af FASSET modellen. Dette inkluderede også N-udvaskning og ændring i jordens N-pulje. Alle... |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Soil; Soil biology; Soil quality; Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/4653/1/4653.pdf |
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| Kristensen, T.; Tvedegaard, N.; Kristensen, I.S.. |
| Organic livestock farms, at least in the northern part of Europe, are dominated by rather specialized units with production based on only one type of livestock, as dairy cows. The specialization is followed by a steady increase in size of the production unit, both in number of livestock and area belonging to the farm. In Denmark has the average organic dairy farm changed from 83 cows and 100 ha in 2000 to 136 cows and 172 ha in 2010; also production per cow has increased in this period from 6825 kg milk annually to 8100 kg in 2010. Such rather large changes over a decade often results in layout of the farm with long distance from the dairy facilities to the farm land. In organic dairy farming this is especially challenging as the dairy herd need to have... |
| Tipo: Journal paper |
Palavras-chave: Dairy cattle; Farm economics; Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/20633/5/20633.pdf |
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| Dalgaard, R.; Halberg, N.; Kristensen, I.S.; Larsen, I.. |
| There is a need for valid and representative data regarding the production, resource use and emissions from typical farming systems in Denmark for analysis of the environmental impact of different systems and as input to product oriented analyses such as Life Cycle Assess-ments of basic food items. An inventory of 31 farm types was constructed on the basis of 2138 farm accounts from 1999 selected and weighted to be representative for the Danish farming sector. The farm accounts were grouped according to the major soil types, the num-ber of standard working hours, the most important enterprise (dairy, pig, different cash crops) and the stocking rate (livestock units per hectare). For each group the account data on the average inputs and outputs, land use... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Environmental aspects; Farming Systems. |
| Ano: 2004 |
URL: http://orgprints.org/15491/1/15491.pdf |
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| Dalgaard, R.; Halberg, N.; Kristensen, I.S.; Larsen, I.. |
| There is a need for valid and representative data on the production,resourceuse and emissions from different farm types in Denmark for publicregulation and assessment.The data should be usable for both area-based environmental assessment(e.g. nitrate leaching per ha)and product oriented environmental assessment(e.g. greenhouse gas emissions per kg pork).The objective of this study was to establish a national agricultural model for estimating data on resource use, production and environmentally important emissions for aset of representative farmtypes. Every year a sample of farm accounts is established in order to report Danish agro-economical data to the ‘Farm Accountancy Data Network’ (FADN), and to produce ‘The annual Danish account statistics for... |
| Tipo: Journal paper |
Palavras-chave: Environmental aspects. |
| Ano: 2006 |
URL: http://orgprints.org/15515/1/15515.pdf |
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| Olesen, J.E.; Berntsen, J.; Petersen, B.M.; Kristensen, I.S.. |
| Farm accounting data from the Institute of Food Economics and from Central Agricultural Registers in Denmark were used to define the import of nitrogen (N) to farmed fields on conventional and organic arable farms to 129 and 51 kg N ha-1 yr-1, respectively. Based on the recorded distribution of crops, a generalised crop rotation was defined for each of the two farming systems. The crop rotation for the organic farm had a high share of spring cereals and additionally 20% grass-clover in the rotation, whereas the conventional rotation was dominated by cereals, primarily winter cereals. The FASSET model was used to simulate the N balance of these two crop rotations. This included N leaching and change in the soil organic N pool. All simulations were... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/4671/1/4671.doc |
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| Hegelund, L.; Sørensen, J.T.; Kjær, J.; Kristensen, I.S.. |
| To evaluate the effect of climate, flock size, age and artificial cover on the use of range area, a study was conducted in 1994 to 1998, involving 5 farms with a total of 37 flocks of layers kept in commercial, free-range, organic systems. Flocks were visited regularly during the production period to record the number and distribution of hens on the range. 2. On average 9% of the flock used the range area, but with large variations both within and between flocks, and this was partly influenced by climatic factors. Range use was affected by temperature, wind, precipitation, season and age, and there was a tendency for reduced numbers of hens on the range with the time of day and increasing flock size. 3. Eight flocks (including houses and range areas) were... |
| Tipo: Newspaper or magazine article |
Palavras-chave: "Organics" in general. |
| Ano: 2005 |
URL: http://orgprints.org/5722/1/5722.pdf |
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| Berntsen, J.; Petersen, B.M.; Kristensen, I.S.; Olesen, J.E.. |
| Med udgangspunkt i regnskabsdata fra Fødevareøkonomisk Institut (FØI) og data fra Centrale Registre (CR) blev importen af kvælstof (N) i gødning til marken til konventionelle og økologiske planteavlere estimeret til hhv. 129 og 51 kg N ha-1 år-1. Desuden blev der med udgangspunkt i den aktuelle afgrødefordeling opstillet et generelt sædskifte for hver af de to systemer. Det opstillede sædskifte for den økologiske planteavl havde en høj andel af vårsæd og desuden 20% kløvergræs, mens den konventionelle planteavl var domineret af kornafgrøder primært i form af vintersæd. Med baggrund i disse model-sædskifter blev N-balancen på markniveau beregnet ved anvendelse af FASSET modellen. Dette inkluderede også N-udvaskning og ændring i jordens Npulje. Alle... |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Production systems; Farming Systems; Air and water emissions. |
| Ano: 2004 |
URL: http://orgprints.org/4605/1/4605.pdf |
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| Registros recuperados: 11 | |
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