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Title: Object-Oriented Agricultural System Modeling: Component-Driven Nutrient Dynamics and Crop Yield Simulations

Author
item Ascough Ii, James
item DAVID, OLAF - Colorado State University
item KRAUSE, PETER - University Of Jena
item Ahuja, Lajpat

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 9/15/2009
Publication Date: 11/1/2009
Citation: Ascough II, J.C., David, O., Krause, P., Ahuja, L.R. 2009. Object-Oriented Agricultural System Modeling: Component-Driven Nutrient Dynamics and Crop Yield Simulations. ASA-CSSA-SSSA Annual Meeting Abstracts.

Interpretive Summary: Challenges in agro-ecosystem conservation management have created demand for state-of-the-art, integrated, and flexible modeling tools. For example, agricultural system modeling tools are needed which are robust and fast enough to be applied on large watershed scales, but which are also able to simulate the impact of changes on single fields or small areas of a specific land use in the watershed. In addition, numerous environmental modeling frameworks such as the Object Modeling System (OMS) are currently under development with the chief purpose of integrating science process components into collaborative and customizable modeling systems. To face these challenges, the OMS was used to combine the fully-distributed hydrological model J2000 with the nitrogen transport and crop growth components of the Soil Water Assessment Tool SWAT model (which are normally applied in a quasi-distributed approach). This combination extends the quantitative focus of J2000 with component-based qualitative processes and helps to overcome the semi-distributed limitation of SWAT. The modeling system was applied to watersheds in Germany and the Midwestern United States and was able to accurately reproduce daily hydrological as well as nitrogen and crop dynamics.

Technical Abstract: Challenges in agro-ecosystem conservation management have created demand for state-of-the-art, integrated, and flexible modeling tools. For example, agricultural system modeling tools are needed which are robust and fast enough to be applied on large watershed scales, but which are also able to simulate the impact of changes on single fields or small areas of a specific land use in the watershed. In addition, numerous environmental modeling frameworks such as the Object Modeling System (OMS) are currently under development with the chief purpose of integrating science process components into collaborative and customizable modeling systems. To face these challenges, the OMS was used to combine the fully-distributed hydrological model J2000 with the nitrogen transport and crop growth components of the Soil Water Assessment Tool SWAT model (which are normally applied in a quasi-distributed approach). This combination extends the quantitative focus of J2000 with component-based qualitative processes and helps to overcome the semi-distributed limitation of SWAT. The modeling system was applied to watersheds in Germany and the Midwestern United States and was able to accurately reproduce daily hydrological as well as nitrogen and crop dynamics.