Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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A Summary of Research Activities from the AgMIP Potato Crop Modeling Intercomparison Pilot
Fleisher, D.H. ; Condori, B. ; Quiroz, R. ; Alva, A. ; Asseng, S. ; Barreda, Carolina ; Berghuijs, H.N.C. ; Bindi, M. ; Boote, K.J. ; Craigon, J. ; Fangmeier, A. ; Ferrise, Roberto ; Franke, A.C. ; Gayler, S. ; Govindakrishnan, P.M. ; Harahagazwe, Dieudonne ; Hoogenboom, G. ; Kremer, P. ; Kroes, J. ; Naresh Kumar, S. ; Merante, Paolo ; Nendel, C. ; Olesen, J.E. ; Parker, P.S. ; Pleijel, H. ; Raes, Dirk ; Raymundo, Rubi ; Reidsma, P. ; Ruana, A. ; Silva, J.V. ; Stella, T. ; Stockle, Claudio ; Supit, I. ; Evert, F.K. van; Vandermeiren, K. ; Vanuytrecht, Eline ; Vorne, V. ; Wolf, J. ; Woli, Prem - \ 2018
Activity-1 of the potato crop model intercomparison pilot was recently completed and focused on quantifying multi-model uncertainty to climate responses when using common data sets from low-and high-input management sites. Median model ensemble response outperformed any single model in terms of replicatingobserved yield across all sites. Uncertainty among models averaged 15% higher for low-versus high-input sites, with larger differences observed for evapotranspiration (ET), nitrogen uptake, and water use efficiency as compared to dry matter. A minimum of five partial, or three full, calibrated models was required for an ensemble approach to keep variability below that of common field variation. Model variation was not influenced by carbon dioxide (C), but increased as much as 41 and 23% for yield and ET respectively as temperature (T) or rainfall (W) moved away from historical levels. Increases in T accounted for the highest amount of uncertainty, suggesting that methods and parameters for T sensitivity represent a considerable unknown among models. Activity-2 research is on-going and tests the capability of multiple models to mimic effects of elevated C concentration on potato yields measured at eight different locations in Europe. A subset from observed OTC and FACE data was used to initially calibrate the models. This research will also evaluate the stability of the models’ calibration with respect to changes in geographic location, as the same variety was used in all locations. This presentation will summarize the Activity-1 results and discuss the current status of Activity-2 investigations.
Effect of climatic conditions on tuber yield (Solanum tuberosum L.) in the European 'CHIP' experiments
Temmerman, L. de; Wolf., J. ; Colls, J. ; Bindi, M. ; Fangmeier, A. ; Finnan, J. ; Ojanperä, K. ; Pleijel, H. - \ 2002
European Journal of Agronomy 17 (2002). - ISSN 1161-0301 - p. 243 - 255.
The main objective of the CHIP project was to perform `standardised' investigations of potato (Solanum tuberosum L. cv Bintje) responses to increased O3 and CO2 concentrations by means of open-top chambers (OTC) and free air carbon dioxide enrichment (FACE) systems. The experimental sites are located across Europe representing a broad range of different climatic conditions. In 1998 and 1999 a total number of 12 OTC experiments and four FACE experiments were conducted. According to the specific needs for subsequent modelling purposes, environmental data were collected during experiments, i.e. air temperature, global radiation, air humidity (vapour pressure deficit (VPD)), soil moisture and trace gas concentrations. In the present paper, the results of these measurements are summarised. It was shown that the experiments covered a considerable range of growing season mean air temperatures (13.8–19.9 °C) and global irradiances (12.0–21.3 MJ m-2 per day), the most important driving variables for crop growth simulation models. Analysis of the soils used during the experiments demonstrated that in most cases sufficient nutrient elements were available to guarantee an undisturbed growth. Mean concentrations of CO2 and O3 in ambient air and in different treatments illustrate the observed variability of trace gas exposures between different sites and experiments. However, the effects of these parameters on growth and yield are subject of separate papers. The general climatic conditions across Europe are also causing important growth and yield effects. Comparison of marketable tuber yields revealed an increase at higher latitudes. This result was associated with lower temperatures and VPD and longer day lengths at the higher latitudes, which in turn were associated with longer growing seasons.
Final Report
Temmerman, L. de; Bindi, M. ; Craigon, J. ; Fangmeier, A. ; Hacour, A. ; Pleijel, H. ; Vandermeiren, K. ; Vorne, V. ; Wolf, J. - \ 2000
Belgium : Commission of the European Union - 32 p.
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