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| Topp, Cairistiona F E; Doyle, Chris J; Watson, Christine A. |
| This report was presented at the UK Organic Research 2002 Conference of the Colloquium of Organic Researchers (COR). Organic farming systems rely on the management of biological cycles for the provision of nutrients, which are crucial to maximising the production from the system. Rotations based on the use of grass-legume leys are central to the concept of organic farming systems, because they have the potential to support both animal production, and a subsequent, exploitative, arable cropping phase. A major challenge in organic farming is managing the supply of nitrogen, since it has a key role in governing both productivity and environmental impact. Hence, within a rotational system, there is a need to understand the complex interactions that are... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Farming Systems; Crop husbandry. |
| Ano: 2002 |
URL: http://orgprints.org/8295/1/topp_Framework_assessing_crop_production.pdf |
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| Topp, Cairistiona F E; Watson, Christine A; Stockdale, Elizabeth. |
| This report was presented at the UK Organic Research 2002 Conference.Within organic systems, the successful management of nutrients at the field level is crucial for maximising production and minimising the environmental impacts. This requires that the farmer makes the best possible use of nutrients excreted by the grazing or housed livestock. In addition, the farmer must successfully manage the nutrients built-up in the ley phase of the crop rotation over the whole of the arable phase period. To analyse these complex flows, a nutrient budget model has been developed that describes the spatial and temporal flows within the organic farming system. The concept is analogous to treating nutrients as a currency where the flow of nutrients represents a cashflow.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management. |
| Ano: 2002 |
URL: http://orgprints.org/8305/1/topp_nutrients_currency.pdf |
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| Doyle, Chris J; Topp, Cairistiona F E. |
| This report was presented at the UK Organic Research 2002 Conference of the Colloquium of Organic Researchers (COR). Forage legumes, with their ability to fix nitrogen biologically, seem especially attractive for organic livestock production. In an attempt to assess their true potential, this study draws on a four-year trial conducted at 12 sites in northern Europe with four different forage legumes. One third of the sites were managed as organic systems, with the harvested forage being fed as silage to dairy cows. Based on the trial results, an economic assessment has been made of the potential of forage legumes to improve the competitive edge of organic dairy systems, relative to conventional grass-based ones. Although the results suggest that the... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops; Farm nutrient management; Animal husbandry; Farm economics. |
| Ano: 2002 |
URL: http://orgprints.org/8298/1/doyle_topp_Forage_livestock_systems.pdf |
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| Nicholas, Phillipa K; Padel, Susanne; Fowler, Sue; Lampkin, Nic; Topp, Cairistiona F E; Weller, Richard. |
| This report was presented at the UK Organic Research 2002 Conference. On organic dairy farms, computer simulation models can be used to predict more rapidly and at less cost than field trials the outcome of changes to management strategies or physical resource inputs. Such models need to be validated with data from existing organic dairy farms to ensure that the predictions made are realistic. As part of a larger organic dairy farm modelling project, this study will use data from 2 contrasting organic dairy systems at Ty Gwyn research farm, to validate a whole farm dairy system model developed by the Scottish Agricultural College. The model will be used in future work to identify the most productive and resource use efficient organic dairy systems across a... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Dairy cattle; Knowledge management; Technology transfer. |
| Ano: 2002 |
URL: http://orgprints.org/8392/1/nicholas_computer_simulation_model_dairy.pdf |
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