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Agricultural Policy Environmental EXtender (APEX) Model: An Emerging Tool for Landscape and Watershed Environmental Analyses, The

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Abstract

The Agricultural Policy Environmental eXtender (APEX) model was developed by the Blacklands Research and Extension Center in Temple, Texas. APEX is a flexible and dynamic tool that is capable of simulating a wide array of management practices, cropping systems, and other land use across a broad range of agricultural landscapes, including whole farms and small watersheds. The model can be configured for novel land management strategies, such as filter strip impacts on pollutant losses from upslope cropfields, intensive rotational grazing scenarios depicting movement of cows between paddocks, vegetated grassed waterways in combination with filter strip impacts, and land application of manure removal from livestock feedlots or waste storage ponds. A description of the APEX model is provided, including an overview of all the major components in the model. Applications of the model are then reviewed, starting with livestock manure and other management scenarios performed for Livestock and the Environment: A National Pilot Project (NPP), and then continuing with feedlot, pesticide, forestry, buffer strip, conservation practice, and other management or land use scenarios performed at the plot, field, watershed, or regional scale. The application descriptions include a summary of calibration and/or validation results obtained for the different NPP assessments as well as for other APEX simulation studies. Available APEX Geographic Information System–based or Windows-based interfaces are also described, as are forthcoming future improvements and additional research needs for the model.

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  • Philip W. Gassman & Jimmy R. Williams & Xiuying Wang & Ali Saleh & Edward Osei & Larry M. Hauck & R. César Izaurralde & Joan D. Flowers, 2009. "Agricultural Policy Environmental EXtender (APEX) Model: An Emerging Tool for Landscape and Watershed Environmental Analyses, The," Center for Agricultural and Rural Development (CARD) Publications 09-tr49, Center for Agricultural and Rural Development (CARD) at Iowa State University.
  • Handle: RePEc:ias:cpaper:09-tr49
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    1. Osei, Edward & Jafri, Syed H., 2015. "In-field Spatial Variability and Profitability of Precision Nitrogen Application On Corn in Buchanan County, Iowa," 2015 AAEA & WAEA Joint Annual Meeting, July 26-28, San Francisco, California 205845, Agricultural and Applied Economics Association;Western Agricultural Economics Association.
    2. Cisneros, J.M. & Grau, J.B. & Antón, J.M. & de Prada, J.D. & Cantero, A. & Degioanni, A.J., 2011. "Assessing multi-criteria approaches with environmental, economic and social attributes, weights and procedures: A case study in the Pampas, Argentina," Agricultural Water Management, Elsevier, vol. 98(10), pages 1545-1556, August.
    3. Osei, Edward & Jafri, Syed, 2016. "Climate Change impacts on Agricultural Production and Farm Incomes in Texas," 2016 Annual Meeting, July 31-August 2, 2016, Boston, Massachusetts 236053, Agricultural and Applied Economics Association.
    4. Ribaudo, Marc & Savage, Jeffrey & Aillery, Marcel P., 2014. "An Economic Assessment of Policy Options To Reduce Agricultural Pollutants in the Chesapeake Bay," Economic Research Report 171880, United States Department of Agriculture, Economic Research Service.
    5. Ribaudo, Marc & Savage, Jeffrey, 2014. "Controlling non-additional credits from nutrient management in water quality trading programs through eligibility baseline stringency," Ecological Economics, Elsevier, vol. 105(C), pages 233-239.
    6. Mark Siemers & Stephen Plotkin & Philip W. Gassman, 2014. "Interactive APEX (i_APEX) USER'S GUIDE USING APEX2110 and APEX0806," Center for Agricultural and Rural Development (CARD) Publications 14-tr50, Center for Agricultural and Rural Development (CARD) at Iowa State University.
    7. Osei, Edward, 2016. "Optimal distribution of conservation practices in the Upper Washita River basin, Oklahoma," 2016 Annual Meeting, July 31-August 2, 2016, Boston, Massachusetts 236013, Agricultural and Applied Economics Association.
    8. Osei, Edward & Li, Huijun, 2016. "Value of information: costs and returns of precision corn production in Livingston County, Illinois," 2016 Annual Meeting, July 31-August 2, 2016, Boston, Massachusetts 236184, Agricultural and Applied Economics Association.
    9. Spencer, Daniel S. & Barnes, James N. & Coatney, Kalyn T. & Parman, Bryon J. & Coble, Keith H., 2017. "Property Rights And The Economics Of Non-Point Source Water Regulations In Agriculture: A New Biophysical-Economic Methodological Approach," 2017 Annual Meeting, February 4-7, 2017, Mobile, Alabama 252835, Southern Agricultural Economics Association.
    10. Osei, Edward & Steiner, Jean & Saleh, Ali, 2015. "Economic Viability of Beef Cattle Grazing Systems under Prolonged Drought," 2015 AAEA & WAEA Joint Annual Meeting, July 26-28, San Francisco, California 205850, Agricultural and Applied Economics Association;Western Agricultural Economics Association.
    11. Degen Lin & Hao Guo & Fang Lian & Yuan Gao & Yaojie Yue & Jing’ai Wang, 2016. "A Quantitative Method for Long-Term Water Erosion Impacts on Productivity with a Lack of Field Experiments: A Case Study in Huaihe Watershed, China," Sustainability, MDPI, Open Access Journal, vol. 8(7), pages 1-18, July.

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    Keywords

    APEX; best management practices; farm and watershed simulations; soil carbon; water quality.;

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