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Author (up) Korhonen, P. url  openurl
  Title Intercomparison of timothy models in northern countries Type
  Year 2015 Publication FACCE MACSUR Reports Abbreviated Journal  
  Volume 5 Issue Pages Sp5-31  
  Keywords  
  Abstract Forage-based livestock and dairy production are the economic backbone of agriculture in many northern countries. In northern Europe and eastern Canada, forage grasses are commonly grown intensively for silage and hay as a part of crop rotation. In those regions, timothy (Phleum pratense L.) is one of the most widely grown grass species. Models that simulate the development of yield and nutritive quality have been developed for timothy, but the performance of different models has not been compared so far.In this study, we compare the performance of the models BASGRA, CATIMO, and STICS for the  predictions of timothy yield at 7 sites located in Finland, Norway, Sweden, and Canada. In addition to yield, model predictions of additional variables, such as leaf area index, specific leaf area, and nutritive quality are gathered on a daily basis. Observed data will be used for two distinct calibrations: 1) Cultivar-specific and 2) ”global”, using all cultivars. The performance of the models will be tested by simulating all sites and years with both the 5 cultivar-specific parameter sets and the global parameter set.The first results of the comparison will be presented with a particular emphasis on dry matter yield predictions.The results will provide information about the uncertainties related to yield predictions of different timothy models and calibrations, the strengths and weaknesses of different modelling approaches, and the sensitivity of models to cultivar-specific parameters. No Label  
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  Area Expedition Conference MACSUR Science Conference 2015 »Integrated Climate Risk Assessment in Agriculture & Food«, 8–9+10 April 2015, Reading, UK  
  Notes Approved no  
  Call Number MA @ admin @ Serial 2146  
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Author (up) Korhonen, P.; Palosuo, T.; Höglind, M.; Persson, T.; Oijen, M.V.; Jégo, G.; Virkajärvi, P.; Bélanger, G.; Gustavsson, A.-M. url  openurl
  Title Intercomparison of timothy models in northern countries Type Conference Article
  Year 2016 Publication Abbreviated Journal  
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  Corporate Author Thesis  
  Publisher Place of Publication Berlin (Germany) Editor  
  Language Summary Language Original Title  
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  ISSN ISBN Medium  
  Area Expedition Conference International Crop Modelling Symposium iCROPM 2016, 2016-05-15 to 2016-05-17, Berlin, Germany  
  Notes Approved no  
  Call Number MA @ admin @ Serial 4912  
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Author (up) Korhonen, P.; Palosuo, T.; Höglind, M.; Persson, T.; van Oijen, M.; Jego, G.; Virkajärvi, P.; Belanger, G.; Gustavsson, A.M. openurl 
  Title Intercomparison of models for simulating timothy yield in Northern countries. The multiple roles of grassland in the European bioeconomy Type Conference Article
  Year 2016 Publication Abbreviated Journal  
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  Publisher Place of Publication Trondheim, Norway Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title General Meeting of the European Grassland Federation  
  Series Volume 26 Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference General Meeting of the European Grassland Federation, 2016-09-04 to 2016-09-08, Trondheim, Norway 26:  
  Notes Approved no  
  Call Number MA @ admin @ Serial 5168  
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Author (up) Korhonen, P.; Palosuo, T.; Persson, T.; Höglind, M.; Jego, G.; Van Oijen, M.; Gustavsson, A.-M.; Belanger, G.; Virkajärvi, P. doi  openurl
  Title Modelling grass yields in northern climates – a comparison of three growth models for timothy Type Journal Article
  Year 2018 Publication Field Crops Research Abbreviated Journal Field Crops Research  
  Volume 224 Issue Pages 37-47  
  Keywords Forage grass; Model comparison; Timothy; Uncertainty; Yield; Nutritive-Value; Catimo Model; Nitrogen Balances; Simulation; Regrowth; Wheat; Stics; Dynamics; Harvest; Water  
  Abstract During the past few years, several studies have compared the performance of crop simulation models to assess the uncertainties in model-based climate change impact assessments and other modelling studies. Many of these studies have concentrated on cereal crops, while fewer model comparisons have been conducted for grasses. We compared the predictions for timothy grass (Phleum pratertse L.) yields for first and second cuts along with the dynamics of above-ground biomass for the grass simulation models BASGRA and CATIMO, and the soil -crop model STICS. The models were calibrated and evaluated using field data from seven sites across Northern Europe and Canada with different climates, soil conditions and management practices. Altogether the models were compared using data on timothy grass from 33 combinations of sites, cultivars and management regimes. Model performances with two calibration approaches, cultivar-specific and generic calibrations, were compared. All the models studied estimated the dynamics of above-ground biomass and the leaf area index satisfactorily, but tended to underestimate the first cut yield. Cultivar-specific calibration resulted in more accurate first cut yield predictions than the generic calibration achieving root mean square errors approximately one third lower for the cultivar-specific calibration. For the second cut, the difference between the calibration methods was small. The results indicate that detailed soil process descriptions improved the overall model performance and the model responses to management, such as nitrogen applications. The results also suggest that taking the genetic variability into account between cultivars of timothy grass also improves the yield estimates. Calibrations using both spring and summer growth data simultaneously revealed that processes determining the growth in these two periods require further attention in model development.  
  Address 2018-07-12  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0378-4290 ISBN Medium  
  Area Expedition Conference  
  Notes CropM, ft_macsur Approved no  
  Call Number MA @ admin @ Serial 5206  
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Author (up) Lehtonen, H.; Palosuo, T.; Korhonen, P.; Liu, X. url  doi
openurl 
  Title Higher Crop Yield Levels in the North Savo Region—Means and Challenges Indicated by Farmers and Their Close Stakeholders Type Journal Article
  Year 2018 Publication Agriculture Abbreviated Journal Agriculture  
  Volume 8 Issue 7 Pages 93  
  Keywords northern Europe; forage grasslands; spring cereals; drainage; soil conidtions; farm management; agricultural policy  
  Abstract The sustainable intensification of farming systems is expected to increase food supply and reduce the negative environmental effects of agriculture. It is also seen as an effective adaptation and mitigation strategy in response to climate change. Our aim is to determine farmers’ and other stakeholders’ views on how higher crop yields can be achieved from their currently low levels. This was investigated in two stakeholder workshops arranged in North Savo, Finland, in 2014 and 2016. The workshop participants, who were organized in discussion groups, considered some agricultural policies to discourage the improvement of crop yields. Policy schemes were seen to support extensification and reduce the motivation for yield improvements. However, the most important means for higher crop yields indicated by workshop participants were improved soil conditions with drainage and liming, in addition to improved crop rotations, better sowing techniques, careful selection of cultivars and forage grass mixtures. Suggested solutions for improving both crop yields and farm income also included optimized use of inputs, focusing production at the most productive fields and actively developed farming skills and knowledge sharing. These latter aspects were more pronounced in 2016, suggesting that farmers’ skills are increasingly being perceived as important.  
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  ISSN 2077-0472 ISBN Medium  
  Area Expedition Conference  
  Notes TradeM, ft_macsur Approved no  
  Call Number MA @ admin @ Serial 5203  
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