Dr. rer. agr. Jan Gräfe
Dr. rer. agr.
Jan Gräfe
Großbeeren
033701 - 78 363
graefe@igzev.de
Wissenschaftler_in
Ausbildung
Berufliche Tätigkeiten
Sonstige Tätigkeiten
Stoffaustausch in Wurzel-Pilz-Beziehungen
Die Versorgung der Pflanzen mit mineralischen Nährstoffen ist Grundlage für ihr Wachstum. Viele Pflanzen bewerkstelligen diese Versorgung in Lebensg...
WeGA – Produkt- und Produktionssicherheit hochintensiver Pflanzenproduktion
Im September 2010 hat das vom Bundesministerium für Bildung und Forschung (BMBF) im Bereich der Agrar- und Ernährungsforschung bewilligte Kompetenzn...
DiControl
Auswirkungen des pflanzenbaulichen Managements sowie der Anwendung mikrobieller Biokontrollstämme auf Bodengesundheit und Suppressivität gegenüber ...
Umsetzung eines webbasierten Qualitäts- und Erntemengenmanagements im Spargelanbau
Im Rahmen dieses Forschungsvorhabens soll ein webbasierter Service zur schlagspezifischen Vorhersage von Bodentemperaturen unter den wichtigsten Folie...
| Research profile | |
| The main topic of his research is the modelling and measurement of the various physical and physiological states of the Soil Vegetation Atmosphere Transfer system (SVAT). Adopted measurement methods include leaf gas exchange and fluorescence, UV-VIS-NIR spectroscopy, VIS/NIR imaging, soil hydrology parameterisation and meteorological approaches. His efforts in SVAT-modelling led to the development of forecast software for soil temperatures under plastic covers, which is now currently used for plastic mulch management in asparagus production in Germany.
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| Professional appointments | |
| Since 2009 | Scientist, IGZ |
| Since 1999 | IT-Administrator and Scientist, IGZ |
| 1997–1998 | Research associate, Potsdam-Institute of Climate Impact Research
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| Education | |
| 2006 | PhD, Agricultural Sciences, Humboldt-Universität zu Berlin |
| 1993–1996 | Scholarship of the German Environmental Foundation |
| 1988–1993 | Studies of Agricultural Sciences, Humboldt-Universität zu Berlin |
| 1982–1985 | Apprenticeship in Agriculture, Klötze, Saxony-Anhalt |
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| Teaching and supervision | |
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Arbuscular Mycorrhiza Alleviates Restrictions to Substrate Water Flow and Delays Transpiration Limitation to Stronger Drought in Tomato
Bitterlich, M.; Sandmann, M.; Graefe J. 2018. Arbuscular Mycorrhiza Alleviates Restrictions to Substrate Water Flow and Delays Transpiration Limitation to Stronger Drought in Tomato. Frontiers in Plant Science 9:154.
DOI: 10.3389/fpls.2018.00154
→Arbuscular mycorrhiza improves substrate hydraulic conductivity in the plant available moisture range under root growth exclusion
Bitterlich, M.; Franken, P.; Graefe J. 2018. Arbuscular mycorrhiza improves substrate hydraulic conductivity in the plant available moisture range under root growth exclusion. Frontiers in Plant Science 9:301.
DOI: 10.3389/fpls.2018.00301
→Effects of developmental stage and reduced UVB and low UV conditions on secondary plant metabolite profiles in pak choi (Brassica rapa spp. chinesis)
Heinze, M.; Hanschen, F.; Wiesner-Reinhold, M.; Baldermann, S.; Graefe, J.; Schreiner, M.; Neugart, S. 2018. Effects of developmental stage and reduced UVB and low UV conditions on secondary plant metabolite profiles in pak choi (Brassica rapa spp. chinesis). Journal of Agricultural and Food Chemistry 66, 1678-1692.
DOI: 10.1021/acs.jafc.7b03996
→The use of features from fluorescence, thermography and NDVI imaging to detect biotic stress in lettuce
Sandmann, M., Grosch, R., and Gräfe, J. 2018. The use of features from fluorescence, thermography and NDVI imaging to detect biotic stress in lettuce. Plant Disease 102, 1101-1107.
DOI: 10.1094/PDIS-10-17-1536-RE
→An operational forecast model for soil temperature in plastic-covered asparagus production systems.
Graefe, J. 2017. An operational forecast model for soil temperature in plastic-covered asparagus production systems. Acta Horticulturae 1154, 121-128.
DOI: 10.1007/s00203-017-1394-x
→Shortwave radiation transfer trough a plant canopy covered by single and double layers of plastic.
Graefe, J.; Sandmann, M. 2014. Shortwave radiation transfer trough a plant canopy covered by single and double layers of plastic. Agricultural and Forest Meteorology 201, 196-208.
http://www.sciencedirect.com/science/article/pii/S0168192314002627#
Optical methods for the non-destructive estimation of leaf area index in kohlrabi and lettuce.
Sandmann, M.; Graefe, J.; Feller, C. 2013. Optical methods for the non-destructive estimation of leaf area index in kohlrabi and lettuce. Scientia Horticulturae 156, 113-120.
→Bud and spear development of asparagus under constant temperature.
Feller, C.; Graefe, J.; Fink, M. 2012. Bud and spear development of asparagus under constant temperature. Agricultural Sciences 3 (4), 455-461.
→A process-oriented and stochastic simulation model for asparagus spear growth and yield.
Graefe, J.; Heißner, A.; Feller, C.; Paschold, H.-P.; Fink, M.; Schreiner, M. 2010. A process-oriented and stochastic simulation model for asparagus spear growth and yield. European Journal of Agronomy 32, 195-204. →
A new approach to calculate the particle density of soils considering properties of the soil organic matter and the mineral matrix.
Rühlmann, J.; Körschens, M.; Graefe, J. 2005. A new approach to calculate the particle density of soils considering properties of the soil organic matter and the mineral matrix. Geoderma 130 (3-4), 272-283. →
Relationship between tuber and leaf growth in radish (Raphanus sativus L. var. sativus) analysed as result of an optimal process.
Heißner, A.; Graefe, J.; Arnold, E. 2005. Relationship between tuber and leaf growth in radish (Raphanus sativus L. var. sativus) analysed as result of an optimal process. European Journal of Horticultural Science 70 (1), 7-15. →
Simulation of soil heating in ridges partly covered with plastic mulch, Part I: Energy balance model.
Graefe, J. 2005. Simulation of soil heating in ridges partly covered with plastic mulch, Part I: Energy balance model. Biosystems Engineering 92 (3), 391-407. →
Simulation of soil heating in ridges partly covered with plastic mulch, Part II: Model calibration and validation
Graefe, J.; Schmidt, S.; Heißner, A.; Rusin, R.; Wonneberger, C. 2005. Simulation of soil heating in ridges partly covered with plastic mulch, Part II: Model calibration and validation. Biosystems Engineering 92 (4), 495-512.
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Roughness layer corrections with emphasis on SVAT model applications.
Graefe, J. 2004. Roughness layer corrections with emphasis on SVAT model applications. Agricultural and Forest Meteorology 124 (3-4), 237-251. →
Simplified procedure for steady-state root nutrient uptake with linearized Michaelis-Menten kinetics
Gräfe, J. & R.O. Kuchenbuch, 2002. Simplified procedure for steady-state root nutrient uptake with linearized Michaelis-Menten kinetics. Journal of Plant Nutrition and Soil Science 165(6), 719-724. →
Simplified procedure for steady-state root nutrient uptake with linearized Michaelis-Menten kinetics.
Graefe, J.; Kuchenbuch, R.O. 2002. Simplified procedure for steady-state root nutrient uptake with linearized Michaelis-Menten kinetics. Journal of Plant Nutrition and Soil Science 165 (6), 719-724. →
Mesoscale ecohydrological modelling to analyse regional effects of climate change
Krysanova, V.; Wechsung, F.; Becker, A.; Poschenrieder, W.; Graefe, J. 1999. Mesoscale ecohydrological modelling to analyse regional effects of climate change. Environmental Modeling and Assessment (4), 259-271.
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Prediction of aerodynamic parameters of plant canopies and of soil heating in ridges covered woth plastic mulch as contributions to SVAT modelling.
Graefe, J. 2006. Prediction of aerodynamic parameters of plant canopies and of soil heating in ridges covered woth plastic mulch as contributions to SVAT modelling. Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 111 S., Dissertation.
Erweitertes Temperatur-Monitoring im Spargel.
Gräfe, J. 2014. Erweitertes Temperatur-Monitoring im Spargel. Gemüse 50 (6), 48-49.
Monitoring des Pflanzenwachstums unter Feldbedingungen.
Gräfe, J.; Sandmann, M. 2013. Monitoring des Pflanzenwachstums unter Feldbedingungen. Jahresbericht 2011/2012 des Leibniz-Institutes für Gemüse- und Zierpflanzenbau Großbeeren/Erfurt, S. 48-49.
Phenological growth stages of asparagus (Asparagus officinalis): codification and description according to the BBCH scale.
Feller, C.; Graefe, J. 2013. Phenological growth stages of asparagus (Asparagus officinalis): codification and description according to the BBCH scale. XIIIth International Asparagus Symposium. 17.-19.10.2013, Nanchang, China, Abstrcatbook, S. 64.
‚Warme Füße’ sind das A und O.
Feller, C.; Gräfe, J. 2011. ‚Warme Füße’ sind das A und O. Jahresbericht 2009/2010 des Leibniz-Institutes für Gemüse- und Zierpflanzenbau Großbeeren/Erfurt, 46-47.
Effects of temperature on dormancy of asparagus.
Feller, C.; Gräfe, J.; Fink, M; Heißner, A. 2010. Effects of temperature on dormancy of asparagus. BHGL-Schriftenreihe 27, 54.
Einfluss der Dammtemperatur auf den Anteil hohler und berosteter Spargelstangen.
Feller, C.; Sprengel, M; Gräfe, J. 2010.Einfluss der Dammtemperatur auf den Anteil hohler und berosteter Spargelstangen. BHGL-Schriftenreihe 27, 157.
Erntedauer und Wirtschaftlichkeit bei Spargel.
Feller, C.; Graefe, J.; Fink. M. 2010. Erntedauer und Wirtschaftlichkeit bei Spargel. Spargel & und Erdbeer Profi 12 (1), 22-24.
Unter welchem Spargeldamm ist es am wärmsten?
Gräfe, J. Viehöfer, A. 2010. Unter welchem Spargeldamm ist es am wärmsten? Gemüse 46 (5), 33-34.
A process-oriented and stochastic simulation model for asparagus spear growth and yield.
Gräfe J., Heißner, A., Feller, C.; Paschold, P.-J., Fink, M.; Schreiner, M. 2009. A process-oriented and stochastic simulation model for asparagus spear growth and yield. Abstract, XII. International Asparagus Symposium. Lima 29th October - 01st November 2009, S. 57.
Computergestützt die Dammtemperatur und den Spargelertrag vorhersagen.
Gräfe, J.; Feller, C.; Paschold, P.-J. 2009. Computergestützt die Dammtemperatur und den Spargelertrag vorhersagen. Gemüse 45 (4), 44-46.
Effects of temperature on dormancy of asparagus.
Feller, C.; Gräfe J., Fink, M.; Heißner, A. 2009. Effects of temperature on dormancy of asparagus. XII. Abstract, International Asparagus Symposium. Lima, 29th October - 01st November 2009, IPEH-Peruvian Asparagus and Vegetables Institute, S. 111.
A process oriented and stochastic model for asparagus spear growth.
Graefe, J.; Feller, C.; Heißner, A. 2008. A process oriented and stochastic model for asparagus spear growth. First Symposium on Horticulture in Europe, 17th-20th February 2008, Vienna Austria, Book of Abstracts, 302.
How to kill an asparagus plant?
Feller, C.; Graefe, J.; Heißner, A. 2008. How to kill an asparagus plant? 1st Symposium on Horticulture in Europe. First Symposium on Horticulture in Europe, 17th-20th February 2008, Vienna Austria, Book of Abstracts, 200.
Plastic row covers – a computational view.
Gräfe, J. 2007. Plastic row covers – a computational view. Research Report IGZ 2005/2006, 20-23.
Die Vorhersage der Erwärmung von Spargeldämmen aus meteorologischen Daten.
Gräfe, J. 2006. Die Vorhersage der Erwärmung von Spargeldämmen aus meteorologischen Daten. Abstract, BHGL-Schriftenreihe 24, 106.
Gross nitrogen transfer rates in field soils measured by 15N-pool dilution.
Ruppel, S.; Augustin, J.; Gräfe, J.; Rühlmann, J.; Peschke, H. 2006. Gross nitrogen transfer rates in field soils measured by 15N-pool dilution. Archives of Agronomy and Soil Science 52 (4), 377-388.
Gross nitrogen transfer rates in field soils measured by 15N-pool dilution.
Ruppel, S.; Augustin, J.; Gräfe, J.; Rühlmann, J.; Peschke, H. 2006. Gross nitrogen transfer rates in field soils measured by 15N-pool dilution. Archives of Agronomy and Soil Science. 52 (4), 377-388.
Microbially mediated gross N transfer rates in field soils in relation to physico-chemical transfer processes.
Ruppel, S.; Gräfe, J.; Augustin, J.; Rühlmann, J.; Peschke, H. 2006. Microbially mediated gross N transfer rates in field soils in relation to physico-chemical transfer processes. Archives of Agronomy and Soil Science. 52 (4), 389-402..
Die Verwendung von abgeleiteten Parametern aus Fluoreszenz-, Thermografie- und NDVI-Abbildungen zur Erkennung von biotisch gestresstem Kopfsalat
Sandmann, M.; Graefe, J.; Grosch, R. 2018. Die Verwendung von abgeleiteten Parametern aus Fluoreszenz-, Thermografie- und NDVI-Abbildungen zur Erkennung von biotisch gestresstem Kopfsalat. 52. Gartenbauwissenschaftliche Jahrestagung, Geisenheim 28.02.-03.03.2018. BHGL-Schriftenreihe Band 33, Seite 64.
Species-specific impact of Fusarium ssp. on Asparagus officinalis crown and root rot
Djalali Farahani-Kofoet, R.; Witzel, K.; Graefe, J.; Grosch, R.; Zrenner, R. 2018. Species-specific impact of Fusarium ssp. on Asparagus officinalis crown and root rot. 14. European Fusarium Seminar (EFS14), Tulln/Austria 8.-11.04.2018. Book of Abstracts, 95.
The capability of features obtained via the non-contact methods of fluorescence, thermography and NDVI to detect biotic stressed lettuce
Sandmann, M.; Graefe, J.; Grosch, R. 2018. The capability of features obtained via the non-contact methods of fluorescence, thermography and NDVI to detect biotic stressed lettuce. BONARES Conference 2018, Berlin 26.02.-28.02.2018. Book of Abstracts.
Gemüsebau
Gräfe, J.; Frühauf, C. 2017. Gemüsebau. In: Bundesanstalt für Landwirtschaft und Ernährung (eds), Agrarmeteorologie, BLE, Bonn, 98-107.
ISBN: 987-3-8308-1297-5
Monitoring and modelling of water and heat fluxes from asparagus fields
Gräfe, J.; Sradnik, A. 2017. Monitoring and modelling of water and heat fluxes from asparagus fields. 14th International Asparagus Symposium Potsdam, Book of Abstracts, 34.
Can stomatal conductance of lettuce be evaluated via thermography?
How to measure stomatal conductance of lettuce leaves via thermography.
Sandmann M.; Grosch R.; Gräfe J. 2016. How to measure stomatal conductance of lettuce leaves via thermography. ISHS Symposium 2016 „Sensing Plant Water Status“, Book of Abstract, 52.
Implications of soil management practices on soil suppressiveness for improved soil health and sustainable plant production
Grosch R.; Gräfe J.; Schellenberg I.; Geistlinger J.; Smalla K.; Pühler P.; Schlüter A.; Neumann G.; Hartmann A.; Schmid M.; Moldaschl M.; Mäder P. 2016. Implications of soil management practices on soil suppressiveness for improved soil health and sustainable plant production. Plant 2030 Status Seminar, Book of Abstract, 23.
Primary metabolism in arbuscular mycorrhizal symbiosis: carbon, nitrogen and sulphur.
Bitterlich, M.; Gräfe, J.; Franken, P. 2016. Primary metabolism in arbuscular mycorrhizal symbiosis: carbon, nitrogen and sulphur. In: Martin, F. (eds).2016. Molecular Mycorrhizal Symbiosis. Wiley, Hoboken NJ, 217-238.
ISBN: 978-1-118-95141-5
An operational forecast model for soil temperature in plastic covered Asparagus production system.
Graefe, J. 2015. An operational forecast model for soil temperature in plastic covered Asparagus production system. MODEL‐IT symposium, Wageningen, Netherlands, Book of Abstracts, 60.
Extending the hourly monitoring of asparagus ridge temperatures with forecasts.
Graefe, J. 2013 Extending the hourly monitoring of asparagus ridge temperatures with forecasts. XIIIth International Asparagus Symposium, Nanchang, Book of Abstracts, 44.