Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2022
Authors
Ritter Atoundem Guimapi Saliou Niassy Bester Tawona Mudereri Elfatih M. Abdel-Rahman Ghislain T. Tepa-Yotto Sevgan Subramanian Samira A. Mohamed Karl Thunes Emily Kimathi Komi Mensah Agboka Manuele Tamò Jean Claude Rwaburindi Buyung Hadi Maged Elkahky May-Guri Sæthre Yeneneh Belayneh Sunday Ekesi Segenet Kelemu Henri E. Z. TonnangAbstract
No abstract has been registered
Authors
P.W. Barnes T.M. Robson P.J. Neale C.E. Williamson R.G. Zepp S. Madronich S.R. Wilson A.L. Andrady A.M. Heikkilä G.H. Bernhard A.F. Bais R.E. Neale J.F. Bornman M.A.K. Jansen A.R. Klekociuk J. Martinez-Abaigar S.A. Robinson Q.-W. Wang A.T. Banaszak D.-P. Häder S. Hylander K.C. Rose S.-Å. Wängberg Bente Føreid W.-C. Hou R. Ossola N.D. Paul J.E. Ukpebor M. P. S. Andersen J. Longstreth T. Schikowski K.R. Solomon B. Sulzberger L.S. Bruckman K.K. Pandey C.C. White L. Zhu M. Zhu P.J. Aucamp J.B. Liley R.L. McKenzie M. Berwick S.N. Byrne L.M. Hollestein R.M. Lucas C.M. Olsen L.E. Rhodes S. Yazar A.R. YoungAbstract
No abstract has been registered
Authors
Kristin Hamre Giulia Micallef Marie Hillestad Johan Johansen Sofie c Remø Wuxiao Zhang Elisabeth Rasmussen Ødegård Hernandez Pedro W Araujo P. Antony Jesu Prabhu Rune WaagbøAbstract
No abstract has been registered
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No abstract has been registered
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No abstract has been registered
Abstract
Tomato greenhouses at high latitudes (≥58°North) require supplemental light to enable high yields and year-round production. Supplemental light systems can differ in lamp type, high-pressure sodium (HPS) or light emitting diode (LED), and also vary in lamp capacity. Based on a combined greenhouse climate, tomato yield, and greenhouse economics model, a methodology was developed, for determining the optimal supplemental light system, dependent on local climate and economic conditions. Two optimisation objectives were considered separately, maximal energy use efficiency (EUE) and maximal net financial result (NFR). The developed methodology was applied to four different greenhouse locations in Norway. At each location, both optimisation objectives were reached with LEDs. The optimal lamp capacities range from 256 to 341 μmol m−2 s−1 (maximal EUE) and 302–323 μmol m−2 s−1 (maximal NFR). The economically optimal lamp capacity is little sensitive to climate conditions. At the lamp type respective NFR maxima, LEDs resulted, on average, in 10% higher tomato yield, 102.2 NOK m−2 year−1 higher NFR, and 35% higher EUE. Consequently, switching from HPS lamps to LEDs enables increasing productivity, energy efficiency and profitability of greenhouse tomato production. Furthermore, the difference between EUE and NFR optima was, on average, 24% lower in terms of EUE and 56% lower in terms of NFR, when using LEDs instead of HPS lamps. On farm-scale, the proposed methodology can be used as decision-support-tool for selecting an efficient and profitable supplemental light system for greenhouse tomato production, dependent on local climate and economic conditions.
Authors
Bertold Mariën Dimitri Papadimitriou Titta Kotilainen Paolo Zuccarini Inge Dox Melanie Verlinden Thilo Heinecke Joachim Mariën Patrick Willems Mieke Decoster Aina Gascó Holger Lange Josep Peñuelas Matteo CampioliAbstract
Accurate estimations of phenophases in deciduous trees are important to understand forest ecosystems and their feedback on the climate. In particular, the timing of leaf senescence is of fundamental importance to trees’ nutrient stoichiometry and drought tolerance and therefore to trees’ vigor and fecundity. Nevertheless, there is no integrated view on the significance, and direction, of seasonal trends in leaf senescence, especially for years characterized by extreme weather events. Difficulties in the acquisition and analyses of hierarchical data can account for this. We collected four years of chlorophyll content index (CCI) measurements in thirty-eight individuals of four deciduous tree species (Betula pendula, Fagus sylvatica, Populus tremula and Quercus robur) in Belgium, Norway and Spain, and analyzed these data using generalized additive models for location, scale and shape (GAMLSS). As a result, (I) the phenological strategy and seasonal trend of leaf senescence in these tree species could be clarified for exceptionally dry and warm years, and (II) the daily average (air) temperature, global radiation, and vapor pressure deficit could be established as main drivers behind the variation in the timing of the senescence transition date. Our results show that the onset of the re-organization phase in the leaf senescence, which we approximated and defined as local minima in the second derivative of a CCI graph, was in all species mainly negatively affected by the average temperature, global radiation and vapor pressure deficit. All together the variables explained 89 to 98% of the variability in the leaf senescence timing. An additional finding is that the generalized beta type 2 and generalized gamma distributions are well suited to model the chlorophyll content index, while the senescence transition date can be modeled using the normal-exponential-student-t, generalized gamma and zero-inflated Box-Cox Cole and Green distributions for beech, oak and birch, and poplar, respectively.
Authors
Marleen Pallandt Bernhard Ahrens Sujan Koirala Holger Lange Markus Reichstein Marion Schrumpf Sönke ZaehleAbstract
No abstract has been registered
Authors
Stephan Hoffmann Marian Schönauer Joachim Heppelmann Antti Asikainen Emmanuel Cacot Benno Eberhard Hubert Hasenauer Janis Ivanovs Dirk Jaeger Andis Lazdins Sima Mohtashami Tadeusz Moskalik Tomas Nordfjell Krzysztof Stereńczak Bruce Talbot Jori Uusitalo Morgan Vuillermoz Rasmus AstrupAbstract
No abstract has been registered
Authors
Geir Wæhler Gustavsen Helge Berglann Elisabeth Jenssen Signe Kårstad Divina Gracia P. RodriguezAbstract
No abstract has been registered