Dear Anapalli and Bahram

please read below list of Langensiepen' papers, i think this person( Langensiepen) is a model's man and can work whit the model very good, if another person wrote that paper(Validating CERES-Wheat under North-German environmental conditions), i can write some note about the model.


whit best regards
E.Amiri

Publikationen
Stand: 5. Januar 2008
Begutachte Beiträge
Während meines Freisemesters im Sommer 2007 habe ich mehrere Modellierarbeiten abschließen können. Sechs Artikel werden derzeit begutachtet und fünf weitere befinden sich in Vorbereitung.
Langensiepen M., Herbst, R. (2008) Denkschrift: Pflanzenbauwissenschaften als interdisziplinäres Forschungsfeld zwischen den Naturwissenschaften und Humanwissenschaften. Humboldt-Universität zu Berlin. ISBN 978-3-86004-215-1 (PDF-Datei 3.4 MB)
Langensiepen M., Hanus H., Schoop P. and Gräsle W. (2008) Validating CERES-Wheat under North-German environmental conditions. Agricultural Systems (Im Druck)
Langensiepen, M., Burgess, S., Lambers, H., Mitchell, P. and Veneklass, E. (2006) A model for simulating the transpiration of Eucalyptus salmonoploia trees. Physiologia Plantarum 127: 465–477
Langensiepen M. (2005) Sofware development and water science. In: Encyclopedia of Water Science, Trimble S. (ed.) M. Dekker, New York (Online at dekker.com)
Langensiepen M. (2005) Scaling transpiration from leaves and canopies. In: Encyclopedia of Water Science, Trimble S. (ed.) M. Dekker, New York (Online at dekker.com)
Langensiepen M. (2005) Quantifying stomatal responses to the environment. In: Encyclopedia of Water Science, Trimble S. (ed.) M. Dekker, New York (Online at dekker.com)
Langensiepen M. (2003) Evaporation and Energy Balance. In: Encyclopedia of Water Science, Stewart B.A. and Howell T. (eds.) M. Dekker, New York pp. 238 - 241
Gabrielle B., Roche R., Angas P., Cantero-Martinez C., Cosentino L., Mantineo M., Langensiepen M., Henault C., Laville P., Nicoullaud B. and Gosse G. (2002) A priori parameterisation of the CERES soil-crop models and tests against several European data sets. Agronomie 22: 119 - 132
Moreshet S., Fuchs M., Cohen Y., Cohen Y., Langensiepen M. (1996) Water transport characteristics of cotton as affected by drip irrigation. Agron. J. 88: 712-722
Langensiepen M. (1995) Introduction to the thermoelectric method for measuring plant sap flux: A comparison between Heat-Balance and Heat-Pulse Methods. Zeitschrift für Bewässerungswirtschaft 30: 53-71
Langensiepen M. (1992) Experimental Verification of an Agrometeorological Transpirationmodel. Zeitschrift für Bewässerungswirtschaft 27: 85-101


Weitere Beiträge
Langensiepen M, Mitchell P, Burgess SSO (2007) Quantifying the Heterogeneity of Transpiration Fluxes from Tree Crowns: Results from a Case Study on Eucalyptus Trees in the West-Australian Wheat-Belt. Tropentag "Utilisation of diversity in land use systems: Sustainable and organic approaches to meet human needs", 9. - 11. October 2007, Witzenhausen/Göttingen, Proceedings.
Langensiepen M. (2007) Improving farming systems design based on the agile modelling paradigm. Farming Systems Design 2007, 10.- 12 September, Catania, Italy, Proceedings. [Beitrag PDF]
Langensiepen M, Herbst R, Mitchell P, Burgess SSO (2007) Die Rolle der Modellierung bei der Zusammenarbeit zwischen den Pflanzenbauwissenschaften und der Pflanzenökologie. 50. Jahrestagung der Deutschen Gesellschaft für Pflanzenbauwissenschaften. Plenarvortrag. 9. - 11. September 2007, Bonn, Tagungsband. [Vortrag Online].
Herbst R, Langensiepen M, Schulte-Eickholt (2007) GIS-based spatial prediction of soils based on the Dempster-Shafer Theorem by multitemporal and multimodel conductivity measurements for an improved modelling of root growth. In Behrens T, Scholten T und Hennings V (Eds.) Biannual Conference of the Commission 1.5 Pedometrics: Book of Abstracts, Tübingen, Germany.
Langensiepen M. (2006) Historische Wurzeln und Perspektiven der Modellierung pflanzlicher Systeme. In Hertwig, F. und Langensiepen, M. (Hrsg.) Modellierung pflanzlicher Systeme aus historischer und aktueller Sicht - Symposium zu Ehren von Prof. Dr. Dr. h. c. Eilhard Alfred Mitscherlich (1874 - 1956). Landwirtschaftlich-Gärtnerische Fakultät, Humboldt-Universität zu Berlin. Schriftenreihe des Landesamtes für Verbraucherschutz, Landwirtschaft und Flurneuordnung Band 7. Ministerium für Ländliche Entwicklung, Umwelt und Verbraucherschutz des Landes Brandenburg. Seiten 6-20 [PDF-Datei]
Langensiepen M., Topcu, S., and Kaman, H. (2006) Modeling the effects of different irrigation application techniques and varietal influences on maize transpiration: A Case study from the North-East Mediterranean. International Symposium on Water and Land Management for Sustainable Irrigated Agriculture. Adana, Türkei 4 - 8 April, 2006.
Langensiepen M. (2005) Application of modelling in agricultural research and education.International Conference on Agricultural Research for Development: European Responses to Changing Global Needs 27-29 April 2005, Swiss Federal Institute of Technology, ETH Zurich, Switzerland Proceedings.
Langensiepen, M., Burgess, S., Lambers, H. and Mitchell, P. (2005) A model for simulating transpiration from Eucalyptus salmonophloia and Eucalyptus wandoo trees. International Workshop "Plant Water Relations in Seasonally Dry Environments" 6-8 July 2005. The School of Plant Biology. The University of Western Australia Crawley, Western Australia. Proceedings
Schultz C., Herbst R., Langensiepen M., Ulrichs C. (2005) Challenges of sustainable aquaculture. Humboldt-Spectrum 1/2005. pp. 42–48 (in German)
Langensiepen M., Fuchs M. and Bergamaschi S. (2004) Modelling Transpiration under contrasting climate conditions. COMBIO 2004, Burswood Convention Center, Perth, Australien 20-24. September 2004. Conference Proceedings
Ulrichs, Ch., Herbst, R., Langensiepen, M., Schultz, C. (2004) Fossil plancton as a natural insectizide. Humboldt-Spectrum 2/2004, pp. 24-28.
Langensiepen M., Herbst R., Schulz C. and Ulrichs C. (2004) What is agricultural science ? Humboldt-Spektrum 1/2004, pp. 12 - 14. [PDF-Datei]
Langensiepen M. (2004) Modelling plant systems: Perspectives of a new research and teaching topic. Humboldt Lectures, Humboldt-University of Berlin. 28 pages.[PDF-Datei]
Langensiepen M. (2001) Validating the DSSAT-Model. In:Optimizing cropping systems. Collaborative Research 192, German Science Foundation. Final report. Hanus H. (ed.) University of Kiel, Germany (in German)
Bergamaschi H., Radin B., Rosa L.M., Bergonci J.I., Aragones R., Santons A.O, Franca S. and Langensiepen M. (2001) Estimating maize water requirements using agrometeorological data. In: Revista Argentina de Agrometeorologia. Climatologia y Fenologia Agricolas, Pascale A.J. and Murphy G.M. (eds.) Buenos Aires, Argentina.
Langensiepen M., Bergamaschi H., Bergonci J. and Rosa L.M. (2000) Optimizing crop water use by deficit irrigation : A case study in South Brazil using Corn. Tropentag "International Agricultural Research: A Contribution to Crisis Prevention", 11. - 12. Oktober 2000, Stuttgart, Proceedings.
Langensiepen M., Fuchs M., Bergamaschi H., Jutzi S., Moreshet S. and Rosa L.M. (2000) Estimating Maize Transpiration using TCorn. International Crop Science Congress, 17. - 22. August 2000, Hamburg, Proceedings.
Bergonci J., Bergamaschi H., Santos A.O., Franca S., Radin B. and Langensiepen M. (2000) Irrigation use efficiency in relation to grain and dry matter yield of maize. International Crop Science Congress, 17. - 22. August 2000, Hamburg, Proceedings.
Bergamaschi H., Radin B., Rosa L.M., Bergonci J., Aragones R., Santos A.O., Franca S. and Langensiepen M. (2000) Estimating maize water requirements using standard agrometeorological data. International Crop Science Congress, 17. - 22. August 2000, Hamburg, Proceedings.
Langensiepen M. (1999) Crop Models in International Development: The Challenges Ahead. Tropentag "Knowledge Partnership: Challenges and Perspectives for Research and Education at the Turn of the Millennium", 14. - 15. Oktober, 1999, Berlin, Proceedings.
Langensiepen M., Fuchs M. and Bergamaschi H. (1999) TCorn : A Computer Model Simulating Maize Transpiration.Tropentag "Knowledge Partnership: Challenges and Perspectives for Research and Education at the Turn of the Millennium", 14. - 15. Oktober, 1999, Berlin, Proceedings.
Langensiepen M., Schröder H., Voß W. and Sieling K. (1999) Simulating wheat and barley yields under the soil and climate conditions of Schleswig- Holstein using DSSAT. 43rd annual meeting of the German Society of Crop Research, 16-18 September 1999, Göttingen, Germany, proceedings (in German).
Langensiepen M., Fuchs M., Bergamaschi H. Gräsle W. and Scholberg J. (1999) Are crop models universally applicable ? International ESA symposium "Modelling Cropping Systems", 21. - 23. Juni 1999, Lleida, Spain, Proceedings.
Gabrielle B., Angas P., Mantineo D., Langensiepen M. and Gosse G. (1999) Extrapolation of soil-crop models across Europe: is model structure still relevant compared to parameterization? International ESA symposium "Modelling Cropping Systems", 21. - 23. Juni 1999, Lleida, Spain, Proceedings.
Langensiepen M. (1998) Options and limits of an ecological oriented irrigation practice. In : Sustainable water management in agricultural production. Amini and Baum (Hrsg.) Journal of Agriculture in the Tropics and the Subtropics, Der Tropenlandwirt, Suppl. 63: 111- 135. Selbstverlag des Verbandes der Tropenlandwirte e.V. Witzenhausen (in German).
Moreshet S., Bergamaschi H., Fuchs M., Langensiepen M., Cohen S. and Bergonzi J.I. (1998) Verifying a modeled output of transpiration from a well watered and stressed corn (Zea maize) crop with the sap flow measurement. International symposium "World Food Security and Crop Production Technologies for Tomorrow" Crop Science Society of Japan, Nov. 1998, Kyoto, Japan. Proceedings.
Langensiepen M., Bergamaschi H. und Fuchs M. (1997) Transpiration of maize plantations: Influences of Phytoactinometry and Water Statuts.Tropentag. Stuttgart, 11. - 12. Dezember 1998, Proceedings.
Langensiepen M. (1997) Improving agrosystem management using meteorological network data: Case studies in Brazil, Germany and Israel. Journal of Agriculture in the Tropics and the Subtropics Der Tropenlandwirt, Suppl. 59, 146 p. ISBN 3-881229280. Selbstverlag des Verbandes der Tropenlandwirte e. V. Witzenhausen, Germany (in German).
Santos A.O., Bergamaschi H., Langensiepen M., Bergonci J.I. and Rosa L.M.(1997) Verificacao do metodo do pulso de calor para medicao direta da transpiracao. In : Congresso Brasileiro de Agrometeorologia 10 Anais, Piracicaba, SP. USP/Soc. Bras. Agrometeor. p. 722 - 724.
Santos A.O., Bergamaschi H., Langensiepen M., Bergonci J.I. and Rosa L.M. (1997) Avaliacao do metodo do pulso de calor para na medicao direta da transpiracao, sob diferentes condicoes hidricas. In : Congresso Brasileiro de Agrometeorologia 10 Anais, Piracicaba, SP. USP/Soc. Bras. Agrometeor. p. 725 - 727.
Langensiepen M., Moreshet S., Rosa L.M., Fuchs M., Bergamaschi H., Cohen Y. and Bergonzi J.I. (1996) Upscaling of heat and energy transfer processes in field plantations from leaf to canopy level. Mitt. Ges. Pflanzenbauwiss. 9: 53 - 54.
Langensiepen M., Bergamaschi H., Cohen S., Cohen Y., Fuchs M., Moreshet S., Rosa L.M.and Santos A.O. (1996) Improved modeling of evapotranspiration by relating leaf stomatal vapor conductance to phytoactinometric plant stand characteristics: A case study using maize. Int. Conf. Evapotranspiration and Irrigation Scheduling, ASAE, IA, ICID, San Antonio 3. - 6. Nov. 1996. Proceedings: 685 - 690.
Langensiepen M. (1995) The concept of sustainability In : Sustainable Resource Management in Tropical and Subtropical Environments. Becker B. (ed.) Selected Seminar Papers No.1, Institute of Crop Science. University of Kassel.
Langensiepen M. (1995) Light extinction and Microclimate at Stream Water Sites: Investigations at the Wilhelmhaeuser Stream System. Second Thesis, Environmental Engineering, University of Kassel (German).
Langensiepen M. (1992) The determination of Actual Transpiration with the Penman-Monteith Combination Method. First Thesis, International Agriculture, University of Kassel (Full versions in German and English).





"Anapalli, Saseendran" <[log in to unmask]> wrote: Mathias,
Thanks for your kind response. You just spilled the beans! When you
doubt that the soil water is correct why do you want to move further
until it is fixed. This explains my worries!
Also, I did not see in any DSSAT manual  that one need switch off some
modules for calibration! (It was many years back I read those books, if
I am wrong you can correct me). If I am correct switch on all the
modules, get the soil water correct first, then move on to nitrogen, and
finally to the crop.
Also, you need to use the DSSAT v4. instead of v3.5. Certainly there is
something better in the newer versions than the old ones always. I am
not sure, if you can download newer versions free when you have the old
version. Please check with the vendors!
Sasi



Saseendran S Anapalli,  Ph. D.
Agricultural Systems Research Unit
USDA-ARS
2150 D Center Ave.
Fort Collins, CO-80526


-----Original Message-----
From: Matthias Langensiepen [mailto:[log in to unmask]]
Sent: Friday, March 07, 2008 12:02 PM
To: Anapalli, Saseendran
Subject: Re: weakness of CERES-wheat

Dear all,

a brief response to Dr. Anapalli's recent mail: We did use the
model "correctly" by strictly following the prescribed procedures
for running the DSSAT 3.5 manual. It took us more than 3 months
alone to calibrate model. After completing this exercise we
came to the conclusion that this procedure is indeed "the most
cumbersome and subjective method of curve fitting that can be
imagined" to speek in Corneluis Teunis de Wit's words. I am aware
of two more large project which currently try in vain to get
the model "right".

Whether the model or the validation set is wrong is an
old argument between model developers and testers. To
my understanding validation data cannot be made subject
to dispute, because they represent reality. It is the
model (fed with appropriate data according to procedures
prescribed by the develeopers) which must compute reality
as good as possible. If it doesn't we have to look for
possible errors which leads to further model improvements.
The soil water routine of CERES is a key candidate and we have
just completed another study which focussed on
this problem. We will inform you about its outcome
when the final results become available.

Matthias


Anapalli, Saseendran wrote:
> Dear Mathias,
> Thanks for taking time to write to the DSSAT list. What you wrote
really
> makes sense, and hope all plant scientist would vote for it.
> Nevertheless, we also need understand the limitations of
> numerical/mathematical models, especially when deal with biological
> systems and their complex interactions with abiotic processes as we do
> in cropping system models.
>         To my understanding, the DSSAT models have mainly three
> components, the water, nitrogen and the crop. For modeling the crop,
one
> need make sure that the first two components works reasonably well for
> the system before modeling the third (the crop). I could not see any
> efforts in the study to do this or see any results presented. I expect
> the least a table showing the crude water balance simulated to prove
> that you got the soil water/nitrogen correct.  For that reason, it is
> left to anybody's guess what those components were doing! It is also
> possible that one do not want to present all the results when we
publish
> papers in journals that charge for pages.
> Notwithstanding, what I see in the study is that the calibration runs
> were made turning off the water and nitrogen modules. To my
> understanding, it is in the field experiment used for calibration one
> should make sure that there were no abiotic stresses but not in the
> model!
> If one is one hundred percent confident that the field experiments are
> free of water, nitrogen, and temperature stresses, simulations
> neglecting (turning off) those processes can be a reasonable
> approximation. But, in the studies presented I could not see
> experimental treatments!  However, I did notice that the optimum N
> treatments were defined as treatments with different levels of N and
> manure levels. Here also, I do not see anything mentioned about water
> levels in the treatment. Did you totally forget about water and
nitrogen
> interactions? Keeping in view of the heterogeneous behavior of the
> various processes and their interactions in the system do you honestly
> think these treatments are be free of abiotic stresses for turning off
> the switches in the model, unless we stretch our imaginations really
> thin?
>
> What I am trying to say is not that the model is or would work
> wonderfully well in all the environments and circumstances, as you
> pointed out and we all know that there are many unknowns and
> uncertainties in the system that we are not able to grasp yet to model
> them correctly. But, given the limitation, at the least the models
> should be used correctly to point out their limitations, and this
would
> certainly appreciated by one and all.
> Hope you appreciate the errors in your simulations.
> Sorry for taking your time and patience.
> Best wishes
> Sasi
>
>
> Saseendran S Anapalli,  Ph. D.
> Agricultural Systems Research Unit
> USDA-ARS
> 2150 D Center Ave.
> Fort Collins, CO-80526
>
>


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