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Expert-N 5.0

Eckart Priesack, Christian Biernath, Florian Heinlein, Christian Klein, Christoph Thieme





Expert-N is a development system for nitrogen turnover models to simulate the N cycle in arable agriculture. The system consists of modular model components for soil water flow, for soil heat and N transport and for crop growth. These components are built up of different standardized model units representing each a single process for the component as N mineralization for N transport or root water uptake for crop growth.

The modular structure allows an easy exchange of model units to compare different submodels or model algorithms describing the same process. For each model component and model unit several distinct interchangeable submodels are available and additional user defined submodels can be included easily by the supported use of dynamic link libraries. This enables the user to analyse the impact of different or new modelling approaches on the simulation results component by component.

By the modular structure Expert-N is also an extremely flexible simulation model for N dynamics in soil-plant systems, which can be easily adapted to the actual simulation purpose including management or research, to the specific site conditions involving crop, soil and agricultural practice and to the quality and availability of data.

Based on a user friendly graphical interface, a windows system for personal computers, Expert-N comprises a menu driven interactive input system to enter all necessary soil, weather, fertilizer and crop data for a particulary field and growing season. This and an online help function offering detailed documentations for every model unit allows even users with minimal computing experience to apply Expert-N and to calculate the mass balance and turnover of N in soils. Simulations are further supported by the possibility to display online the development of important state variables such as soil water content, soil temperature, amount of soil nitrate and plant or root biomass.


Scientific articles

Wöhling, T., Gayler, S., Priesack, E., Ingwersen, J., Wizemann, H.-D., Högy, P., Cuntz, M., Attinger, S., Wulfmeyer, V., Streck, T.: Multiresponse, multiobjective calibration as a diagnostic tool to compare accuracy and structural limitations of five coupled soil-plant models and CLM3.5. Water Resources Research 49 (2013) 8200-8221.

Gayler, S., Ingwersen, J., Priesack, E., Wöhling, T., Wulfmeyer, V., Streck, T.: Assessing the relevance of subsurface processes for the simulation of evapo-transpiration and soil moisture dynamics with CLM3.5: comparison with field data and crop model simulations. Environmental Earth Sciences 69 (2013) 415-427.

Biernath, C., Bittner S., Klein, C., Gayler, S., Hentschel, R., Hoffmann, P., Högy, P., Fangmeier, A., Priesack, E.: Modeling acclimation of leaf photosynthesis to atmospheric CO2 enrichment. European Journal of Agronomy 48 (2013) 74-87.

Biernath, C., Gayler, S., Bittner, S., Klein, C., Högy, P., Fangmeier, A., Priesack, E.: Evaluating the ability of four crop models to predict different environmental impacts on spring wheat grown in open-top chambers. European Journal of Agronomy 35 (2011) 71-82.

Klier, C., Gayler, S., Haberbosch, C., Ruser, R., Stenger, R., Flessa, H., Priesack, E.: Modeling Nitrous Oxide Emissions from Potato-Cropped Soil. Vadose Zone Journal 10 (2011) 184-194.

Bittner, S., Talkner, U., Krämer, I., Beese, F., Hölscher, D., Priesack, E.: Modeling stand water budgets of mixed temperate broad-leaved forest stands by considering variations in species specific drought response. Agricultural and Forest Meteorology 150 (2010) 1347-1357.

Priesack, E., Berkenkamp, A, Gayler, S., Hartmann, H.P., Loos, C.: Development and application of agro-ecosystem models. In: Perspectives for Agroecosystem Management (Eds.: P. Schroeder, J. Pfadenhauer and J.C. Munch), Amsterdam, The Netherlands, Elsevier, (2007), 229-349.

Priesack, E., Gayler, S., Hartmann, H.P.: The impact of crop growth sub-model choice on simulated water and nitrogen balances. Nutr. Cycl. Agroecosys. 75 (2006) 1-13.

Kaharabata, S.K., Drury, C.F., Priesack, E., Desjardins, R.L., McKenney D.J., Tan, C.S., Reynolds, D.: Comparing measured and Expert-N predicted N2O emissions from conventional and no till corn treatments. Nutr. Cycl. Agroecosys. 66 (2003) 107-118.

Berkenkamp, A., Priesack, E., Munch J.C.: Modelling the mineralisation of plant residues on the soil surface. Agronomie 22 (2002) 711-722.

Frolking, S.E., Mosier, A.R., Ojima, D.S., Li, C., Parton, W.J., Potter, C.S., Priesack, E., Stenger, R., Haberbosch, C., Dörsch, P., Flessa, H. and Smith, K.A.: Comparison of N2O emissions from soils at three temperate agricultural sites: simulations of year-round measurements by four models. Nutr. Cycl. Agroecosys., 52 (1998) 77-105

Stenger, R., Priesack, E., Barkle, G., Sperr, C.: Expert-N A tool for simulating nitrogen and carbon dynamics in the soil-plant-atmosphere system. In: NZ Land Treatment Collective Proceedings Technical Session 20: Modelling of Land Treatment Systems. (Eds.: M. Tomer, M. Robinson, G. Gielen). New Plymouth, New Zealand: (1999) 19-28.


Technical information

Operating system(s):  Windows, Linux

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