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| Schmutz, Dr Ulrich; Rayns, Dr Francis; Firth, Mr Chris; Nendel, Dr Claas; Lillywhite, Mr Rob; Zhang, Dr Kefeng; Rahn, Dr Clive. |
| A method is presented to model N leaching in crop rotations on a national scale. Representative crop rotations for different regions and soil types are used in the cross-disciplinary, plant, soil, environment & economics model EU-Rotate_N. By comparing contrasting farming systems (organic and conventional) in the UK, their strengths and weaknesses in delivering environmental and economic sustainability can be assessed. Modelling results show that the annual leaching in different horticultural rotations and UK regions, using median weather, is within the range of 13-88 kg N/ha/year for organic and 54-130 kg N /ha/year for conventional. The weighted annual average figures are 39 kg N/ha/year for organic and 81 kg N/ha/year for conventional, respectively.... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Vegetables United Kingdom Air and water emissions Farm economics Environmental aspects Farm nutrient management. |
| Ano: 2008 |
URL: http://orgprints.org/11737/1/11737.pdf |
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| Schmutz, Dr Ulrich; Rayns, Dr Francis; Firth, Mr Chris; Rosenfeld, Dr Anton; Thorup-Kristensen, Dr Kristian; Zhang, Dr Kefeng; Rahn, Dr Clive. |
| Selected results from the ongoing “EU-Rotate_N” research project are presented. This EU 5th-framework project is developing a model-based decision support system to optimise nitrogen use in horticultural crop rotations across Europe. This paper introduces the economic and the fertility-building crops sub-models, and shows data from model validation and first model runs on an organic farm in central England. Preliminary results show that the model has the potential to be a powerful support tool for farmers and advisors, making decisions on rotational plan-ning. The economic, agronomic and environmental consequences of different rotational designs can be projected and assessed in detail. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farm nutrient management; Air and water emissions; Farm economics. |
| Ano: 2006 |
URL: http://orgprints.org/7292/1/Schmutz_et_al_(2006)_Environmental_%26_economic_modelling.pdf |
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| Firth, Mr Chris; Schmutz, Dr Ulrich. |
| The vegetable market is one of the largest sectors within the UK organic food market. This market has grown by 30% p.a. over the last 5 years, although it is now slowing down to a rate of 10-15% p.a. The production of UK organic vegetables increased rapidly from 1999 -2001, as growers responded to economic and policy incentives, and now the UK is 57% self sufficient in organic vegetables. Many new UK farmers have converted to organic production, although this process has involved high costs, largely due to having to take land out of production in the conversion period. However, once converted, farmers have in many cases, experienced overall financial returns that have been comparable or higher than conventional returns, although these good returns are... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Markets and trade; Vegetables; Farm economics. |
| Ano: 2003 |
URL: http://orgprints.org/8663/2/UK_Veg_market_Firth_and_Schmutz_(2003).pdf |
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