Projects

Object Modeling and Scaling of Landscape Processes and Conservation Effects in Agricultural Systems Appropriated (D)   Accession Number: 411543

Enhanced System Models and Decision Support Tools to Optimize Water Limited Agriculture Appropriated (D)   Accession Number: 414564

The Object Modeling System (Oms): An Advanced Computer Framework for Natural Resources Technology Models and Tools Reimbursable (R)   Accession Number: 409370

Develop Knowledge Base and Quantitative Tools for Optimal Crops and Mgmt Practices for Variable Ltd Water Conditions in the Great Plains Specific Cooperative Agreement (S)   Accession Number: 413422

Develop, Test, and Improve the Needed Science Modules and Models of Agricultural Systems in Oms for Various Applications Specific Cooperative Agreement (S)   Accession Number: 413434

Delivery of a Prototype Field-to-Watershed Scale Model for Ceap Using An Enhanced Oms Specific Cooperative Agreement (S)   Accession Number: 416533

Publications

Economic Risk Analysis of Agricultural Tillage Systems Using the SMART Stochastic Efficiency Software Package - (Proceedings/Symposium)

Ascough II, J.C., Fathelrahman, E.M., Vandenberg, B.C., Green, T.R., Hoag, D.L. 2009. Economic Risk Analysis of Agricultural Tillage Systems Using the SMART Stochastic Efficiency Software Package. World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation. p. 463-469.

An Exploratory Investigation on the Invasiveness of Environmental Modeling Frameworks - (Proceedings/Symposium)

Lloyd, W., David, O., Ascough II, J.C., Rojas, K.W., Carlson, J.R., Leavesley, G.H., Krause, P., Green, T.R., Ahuja, L.R. 2009. An Exploratory Investigation on the Invasiveness of Environmental Modeling Frameworks. World IMACS Congress and MODSIM09 International Congress on Modelling and Simulation.p. 909-915.

Economic Risk Analysis of Experimental Cropping Systems Using the SMART Risk Tool - (Abstract)

Ascough II, J.C., Fathelrahman, E.M., Vandenberg, B.C., Hoag, D., Ahuja, L.R. 2009. Economic Risk Analysis of Experimental Cropping Systems Using the SMART Risk Tool. Meeting Abstract.

A Component-Based Distributed Watershed Model for the USDA CEAP Watershed Assessment Study - (Abstract)

Ascough II, J.C., David, O., Krause, P., Green, T.R., Heathman, G.C., Kralisch, S., Ahuja, L.R. 2009. A Component-Based Distributed Watershed Model for the USDA CEAP Watershed Assessment Study. Meeting Abstract.

Space-Time Dynamics of Soil Water and Process Interactions in Semi-Arid Terrain, Colorado, USA - (Proceedings/Symposium)

Green, T.R., Erskine, R.H., Murphy, M.R., Ma, L., Ascough II, J.C., Mcmaster, G.S., Dunn, G.H., Ahuja, L.R. 2009. Space-Time Dynamics of Soil Water and Process Interactions in Semi-Arid Terrain, Colorado, USA. International Congress on Modeling and Simulation Proceedings. p. 1851-1857.

Evaluating GPFARM Crop Growth, Soil Water, and Soil Nitrogen Components for Colorado Dryland Locations - (Proceedings/Symposium)

Ascough II, J.C. 2009. Evaluating GPFARM Crop Growth, Soil Water, and Soil Nitrogen Components for Colorado Dryland Locations. Natural Resources Research Update (NRRU). Update #238985.

Combined Wind and Water Erosion Modeling - (Abstract) - (12-Feb-09)

Step 7: Choose the "Best" Risk Management Alternative - (Book/Chapter) - (22-Nov-08)

Modeling with Limited Data: The Influence of Crop Rotation and Management on Weed Communities and Crop Yield Loss - (Peer Reviewed Journal)

Stephen R. Canner, L. J. Wiles, Robert H. Erskine, Gregory S. McMaster, Gale H. Dunn, and James C. Ascough, II*: Modeling with Limited Data: The Influence of Crop Rotation and Management on Weed Communities and Crop Yield Loss: Weed Science 2009 57:175¿186

The Importance of Uncertainty and Sensitivity Analyses in Process-Based Models of Carbon and Nitrogen Cycling in Terrestrial Ecosystems with Particular Emphasis on Forest Ecosystems - (Peer Reviewed Journal)

Larocque, G.R., Bhatti, J.S., Liu, J., Ascough II, J.C., Luckai, N., Gordon, A.M. 2008. The Importance of Uncertainty and Sensitivity Analyses in Process-Based Models of Carbon and Nitrogen Cycling in Terrestrial Ecosystems with Particular Emphasis on Forest Ecosystems. Ecological Modeling. 219(3-4):261-263.

Conservation Tillage to Effectively Reduce Interrill Erodibility of Highly-Weathered Ultisols - (Peer Reviewed Journal)

Truman, C.C., Shaw, J.N., Flanagan, D.C., Reeves, D.W., Ascough Ii, J.C. 2009. Conservation Tillage to Effectively Reduce Interrill Erodibility of Highly-Weathered Ultisols. Journal of Soil and Water Conservation. 64:4, pp. 265-275. doi:10.2489/jswc.64.4.265.

Swat Evaluation of Soil and Land Use GIS Data Sets on Simulated Stream Flow - (Peer Reviewed Journal)

Heathman, G.C., Larose, M., Ascough II, J.C. 2009. SWAT Evaluation of Soil and Land Use GIS Data Sets on Simulated Stream Flow. Journal of Soil and Water Conservation. 64(1):17-32.

Model development for evaluating USDA Conservation practices - (Proceedings/Symposium)

Ascough, II, J.C., Romkens, M.J. 2008. Model development for evaluating USDA Conservation practices. Proceedings of the ASCE World Environmental and Water Resources Congress Conference. May 12-18,2008. Honolulu, HI. CD-ROM.

Development of a common water and wind erosion model for soil conservation planning - (Proceedings/Symposium)

Flanagan, D.C., Ascough II, J.C., Wagner, L.E. 2008. Development of a common water and wind erosion model for soil conservation planning. In: Proceedings of the AgroEnviron 2008 (Sixth International Symposium AgroEnviron), April 28-May 1, 2008, Antalya, Turkey. p. 12.

Using Stochastic Effciency Analysis To Factor Distribution Of Weed Escapes Into Weed Management Decisions - (Abstract)

Wiles, L., Fathelrahman, E.M., Wilkerson, G.G., Ascough II, J.C. 2008. Using Stochastic Effciency Analysis To Factor Distribution Of Weed Escapes Into Weed Management Decisions. International Weed Science Congress.

Tillage Effects on Soil Hydraulic Properties in Space and Time: State of the Science - (Review Article)

Strudley, M.W., Green, T.R., Ascough Ii, J.C. 2008. Tillage Effects on Soil Hydraulic Properties in Space and Time: State of the Science. International Journal of Soil and Tillage Research. 99:4-48. 2008.

Development of a Common Water and Wind Erosion Model for Soil Conservation Planning - (Abstract)

Flanagan, D.C., Ascough II, J.C., Wagner, L.E. 2008. Development of a Common Water and Wind Erosion Model for Soil Conservation Planning. In: Proceedings of the Agro-Environment Symposium, April 28-May 1, 2008, Antalya, Turkey. 2008 CDROM.

Tradeoff Analysis Between Economic Development and Climate Change Adaptation Strategies for the Nile River Basin - (Abstract)

Fathelrahman, E.M., Babiker, M., Strzepek, K., Ascough II, J.C., Green, T.R. 2008. Tradeoff Analysis Between Economic Development and Climate Change Adaptation Strategies for the Nile River Basin. Meeting Abstract. p.61.

Insect Pests Models and Insecticide Application - (Book/Chapter)

Ascough Ii, J.C., Fathelrahman, E.M., Mcmaster, G.S. 2008. Insect Pest Models and Insecticide Application. In: Jorgensen, S.E., Faith, B.D. editors. Ecological Models. Vol. (3) Encyclopedia of Ecology., 5 vols. Oxford, Elsevier. p. 1978-1985.

Using the Response Surface Method (RSM) for Economic and Environmental Tradeoffs Between Economics and Environment at the Farm Level - (Proceedings/Symposium)

Ascough Ii, J.C., Fathelrahman, E.M., Hoag, D.L. 2007. Using the Response Surface Method (RSM) for Economic and Environmental Tradeoffs Between Economics and Environment at the Farm Level. Farming Systems Design 2007 Conference, Catania, Sicily, Italy. September 10-12, 2007. Symposium Proceedings p.164-165.

Stakeholder Payoff Matrix for Disparate Tradeoffs - (Proceedings/Symposium)

Hoag, D., Ascough II, J.C., Fathelrahman, E.M., Keske, C.M. 2007. Stakeholder Payoff Matrix for Disparate Tradeoffs. Farming Systems Design 2007 Conference, Catania, Sicily, Italy, September 10-12,2007. Symposium Proceedings, Session 1.6, p150-151.

Ecological Models: Agricultural Models - (Book/Chapter)

Ascough Ii, J.C., Ahuja, L.R., Mcmaster, G.S., Ma, L., Andales, A.A. 2008. Agricultural Models. In: Jorgensen, S.E., Faith, B.D.editors. Ecological Models. Vol. (1) Encyclopedia of Ecology., 5 vols. Oxford, Elsevier. p. 85-95.

Combining ARS Process-Based Water and Wind Erosion Prediction Technologies - (Abstract)

Flanagan, D.C., Frankenberger, J.R., Fox, F.A., Wagner, L.E., Ascough Ii, J.C. 2007. Combining ARS Process-Based Water and Wind Erosion Prediction Technologies. Soil Science Society of America Annual Meeting Abstracts, November 4-8, 2007, New Orleans, Louisiana. 2007 CDROM.

Developing Erosion Prediction Modeling Technology Using the Object Modeling System (OMS): Viability and Challenges - (Abstract)

Ascough Ii, J.C., Flanagan, D.C., David, O., Ahuja, L.R., Rojas, K.W. 2007. Developing Erosion Prediction Modeling Technology Using the Object Modeling System (OMS): Viability and Challenges. American Society of Agronomy Meetings, New Orleans, LA. November 4-8, 2007.

Evaluating EPIC-based Harvest Index Approach for Yield Prediction and Response to Soil Water - (Abstract)

Mcmaster, G.S., Ascough Ii, J.C., Andales, A.A., Edmunds, D.A. 2007. Evaluating EPIC-based Harvest Index Approach for Yield Prediction and Response to Soil Water. ASA-CSSA-SSSA Annual Meeting, New Orleans, November 5,2007 (61-7).

Spatial Variability and Scaling of Infiltration on Undulating Agricultural Terrain - (Abstract)

Green, T.R., Ahuja, L.R., Dunn, G.H., Ascough Ii, J.C., Mcmaster, G.S., Ma, L., Erskine, R.H., Salas, J.D., Palic, D.B., Murphy, M.R. 2007. Spatial Variability and Scaling of Infiltration on Undulating Agricultural Terrain. American Society of Agronomy Meetings New Orleans, November 7,2007 (282-3).

Evaluating GPFARM for No-Tillage Dryland Experimental Sites in Eastern Colorado - (Peer Reviewed Journal)

Ascough Ii, J.C., Mcmaster, G.S., Andales, A.A., Hansen, N.C., Ahuja, L.R., Sherrod, L.A. 2007. Evaluating GPFARM for No-Tillage Dryland Experimental Sites in Eastern Colorado. Transactions of the ASABE, 50(5):1565-1578.

Future Research Challenges for Incorporating Uncertainty in Environmental and Ecological Decision-Making - (Peer Reviewed Journal)

Ascough II, J.C., Maier, H.R., Ravalco, J.K., Strudley, M.W. 2008. Future Research Challenges for Incorporating Uncertainty in Environmental and Ecological Decision-Making. Ecological Modeling. 219(3-4):383-399.

Uncertainty in Environmental Decision-Making: Issues, Challenges and Future Directions - (Book/Chapter)

Maier, H.R., Ascough Ii, J.C., Wattenbach, M., Renschler, C.S., Labiosa, W.B., Ravalico, J.K. 2008. Uncertainty in Environmental Decision-Making: Issues, Challenges and Future Directions. Environmental Modeling & Software.

Integrated Modelling Frameworks for Environmental Assessment and Decision Support - (Book/Chapter)

Rizzoli, A.E., Leavesley, G.H., Ascough Ii, J.C., Argent, R.M., Athanasiadis, I.N., Brilhante, V.C., Claeys, F.H., David, O., Donatelli, M., Gijsbers, P., Havlik, D., Kassahun, A., Krause, P., Quinn, N.W., Scholten, H., Sojda, R.S., Villa, F. 2008. Integrated Modelling Frameworks for Environmental Assessment and Decision Support. Environmental Modeling & Software.

Development of an integrated water and wind erosion model - (Abstract)

Flanagan, D.C., Ascough II, J.C., Wagner, L.E., Geter, W.F. 2006. Development of an integrated water and wind erosion model. American Geophysical Union. December 11-15, 2006, San Francisco, CA. 2006 CDROM.

Gpfarm Evaluation Across a No-Till Dryland Agroecosystem Landscape Catena - (Abstract)

Ascough Ii, J.C., Andales, A.A., Mcmaster, G.S., Ahuja, L.R. 2006. Gpfarm evaluation across a no-till dryland agroecosystem landscape catena. ASA-CSSA-SSSA Annual Meeting Abstracts. Indianapolis, IN. 11/15/2006.

Antibiotic Transport Via Runoff and Soil Loss - (Peer Reviewed Journal)

Davis, J.G., Truman, C.C., Kim, S.C., Ascough II, J.C., Carlson, K. 2006. Antibiotic transport via runoff and soil loss. Journal of Environmental Quality. 35:2250-2260.

Sensitivity of Tile Drainage Flow and Crop Yield on Measured and Calibrated Soil Hydraulic Properties - (Peer Reviewed Journal)

Ma, L., Malone, R.W., Heilman, P., Ahuja, L.R., Meade, T.G., Anapalli, S.S., Ascough Ii, J.C., Kanwar, R.S. 2007. Sensitivity of tile drainage flow and crop yield on measured and calibrated soil hydraulic properties. Geoderma 140:3(2007) 284-296. Published on-line 5/16/2007. doi:10.1016/j.geoderma.2007.04.012

Rzwqm Simulated Effects of Crop Rotation, Tillage, and Controlled Drainage on Crop Yield and Nitrate-N Loss in Drain Flow. - (Peer Reviewed Journal)

Ma, L., Malone, R.W., Heilman, P., Jaynes, D.B., Ahuja, L.R., Saseendran, S.A., Kanwar, R.S., Ascough II, J.C. 2007. RZWQM simulated effects of crop rotation, tillage, and controlled drainage on crop yield and nitrate-n loss in drain flow. Geoderma 140(3):260-271. doi:10/1016/j/geoderma.2007.04.010.

Practical Sensitivity and Uncertainty Analysis Techniques Applied to Agricultural Systems Models - (Abstract)

Ascough Ii, J.C. 2006. Practical sensitivity and uncertainty analysis techniques applied to agricultural systems models. Meeting Abstract. IEMSS. Burlington, VT. July 9-13,2006.

Uncertainty in Environmental Decision-Making: Issues, Challenges and Future Directions - (Proceedings/Symposium)

Maier, H.R., Ascough Ii, J.C. 2006. Uncertainty in environmental decision-making: issues, challenges and future directions. Environmental Modeling & Software.

Simulation Modeling of Limited Irrigation Cropping Systems in the South Platte River Basin - (Abstract)

Ascough Ii, J.C., Hansen, N.C. 2006. Simulation modeling of limited irrigation cropping systems in the south platte river basin. Soil and Water Conservation Society Annual Meeting. July 22-26, 2006. Keystone, Colorado.

Modeling Spatial-Temporal Soil Water and Overland Flow in a Dryland Wheat-Fallow Field Using Maria-Gis - (Abstract)

Green, T.R., Ascough II, J.C., Erskine, R.H., Vandenberg, B.C., Ahuja, L.R. 2006. Modeling spatial-temporal soil water and overland flow in a dryland wheat-fallow field using maria-gis. World Congress of Soil Science. Philadelphia, PA. 7/9-7/15/2006

An Improved Agricultural System Model for Space-Time Simulation of Agricultural Landscape Variability - (Abstract)

Ascough II, J.C., Ma, L., Green, T.R., Flerchinger, G.N., Mcmaster, G.S., Ahuja, L.R., Vandenberg, B.C. 2006. An improved agricultural system model for space-time simulation of agricultural landscape variability. World Congress of Soil Science. July 9-15,2006.

Key Criteria and Selection of Sensitivity Analysis Methods Applied to Natural Resource Models - (Proceedings/Symposium)

Ascough Ii, J.C., Green, T.R., Ma, L., Ahuja, L.R. 2005. Key criteria and selection of sensitivity analysis methods applied to natural resource models. Modsim 2005 International Congress on Modeling and Simulation, Modeling and Simulation Society of Australia and New Zealand, Melbourne, Australia. December 12-15, 2005. p2463-2469.

Key Criteria and Selection of Sensitivity Analysis Methods Applied to Natural Resource Models - (Proceedings/Symposium)

Ascough Ii, J.C., Green, T.R., Ma, L., Ahuja, L.R. 2005. Key criteria and selection of sensitivity analysis methods applied to natural resource models. International Congress on Modeling and Simulation Proceedings. Salt Lake City, UT, November 6-11,2005.

Producers, Decision Support Systems, and Gpfarm: Lessons Learned from a Decade of Development - (Proceedings/Symposium)

Ascough Ii, J.C., Dunn, G.H., Mcmaster, G.S., Ahuja, L.R., Andales, A.A. 2005. Producers, decision support systems, and gpfarm: lessons learned from a decade of development. International Congress on Modeling and Simulation Proceedings.

Multi-Crop Plant Growth Modeling for Agricultural Models and Decision Support Systems - (Proceedings/Symposium)

Mcmaster, G.S., Ascough Ii, J.C., Edmunds, D.A., Andales, A.A., Wagner, L.E., Fox, F.A. 2005. Multi-crop plant growth modeling for agricultural models and decision support systems. International Congress on Modeling and Simulation Proceedings.

Environmental and Economic Analysis of Switchgrass Production for Water Quality Improvement and Alternative Energy Use in Northeast Kansas - (Peer Reviewed Journal)

Nelson, R.G., Ascough Ii, J.C., Langemeier, M.C. 2006. Environmental and economic analysis of switchgrass production for water quality improvement and alternative energy use in northeast kansas. Journal of Environmental Management. (2006). 79: 4 (336-347).

Development of a Hillslope Erosion Module for the Object Modeling System - (Proceedings/Symposium)

Flanagan, D.C., Ascough II, J.C., Geter, W.F., David, O. 2005. Development of a hillslope erosion module for the object modeling system. ASAE Annual International Meeting. Paper No. 05-2012. 1-11 pp.

Spatial Water Quality Modeling Framework Development Using Arcgis9 - (Proceedings/Symposium)

Ascough II, J.C., Green, T.R., Ahuja, L.R., Ma, L., Vandenberg, B.C. 2005. Spatial water quality modeling framework development using ArcGIS9. Proceedings 05-2082. 2005 ASAE Annual International Meeting, Tampa, FL. July 17-20. http://asae/frymulti.com/techpapers.asp?confid=tfl2005.

Assessing the Potential of the Object Modeling System (Oms) for Erosion Prediction Modeling - (Proceedings/Symposium)

Ascough II, J.C., Flanagan, D.C., David, O. 2005. Assessing the potential of the object modeling system (oms) for erosion prediction modeling. Proceedings 05-211. 2005 ASAE Annual International Meeting, Tampa, FL. July 17-20. http://asae/frymulti.com/techpapers.asp?confid=tfl2005.

Development and Evaluation of the Rzwqm-Cropgro Hybrid Model for Soybean Production - (Peer Reviewed Journal)

Ma, L., Hoogenboom, G., Ahuja, L.R., Nielsen, D.C., Ascough II, J.C. 2005.Development and evaluation of the RZWQM-CROPGRO hybrid model for soybean production. Agronomy Journal. 97:1172-1182.

Development and Evaluation of the Rzwqm-Ceres-Maize Hybrid Model for Maize Production - (Peer Reviewed Journal)

Ma, L., Hoogenboom, G., Ahuja, L.R., Ascough Ii, J.C., Saseendran, S.A. 2006. Evaluation of the rzwqm-ceres-maize hybrid model for maize production. Agricultural Systems. 87(3): 274-295.

Decision Making with Environmental Indices - (Book/Chapter)

Hoag, D.L., Ascough Ii, J.C., Keske-Handley, C.G., Koontz, L.R. 2005. Decision making with environmental indices. Book Chapter. In: Burk, A.R. (Ed), New Trends in Ecology Research. Nova Science Publishers, Hauppauge, NY. Chapter 7, pg. 159-182. 2005.

Developing Natural Resource Models Using the Object Modeling System: Feasibility and Challenges - (Peer Reviewed Journal)

Ahuja, L.R., Ascough Ii, J.C., David, O. 2005. Developing natural resource models using the object modeling system: feasibility and challenges. Advances in Geosciences. 3:1-8, 2005.

Modeling Spatial Variability in Agriculture: the Agsimsgis Water Quality Tool - (Abstract)

Ascough Ii, J.C., Green, T.R., Ahuja, L.R., Vandenberg, B.C., Ma, L. 2004. Modeling spatial variability in agriculture: the agsimsgis water quality tool. Meeting Abstract. ESRI Southwest Users Group 2004 conference, Telleride, CO, October 20-22, 2004. www.swuggis.org/swug_2004/abstracts.shtml.

Practical Application of Sensitivity and Uncertainty Analysis Techniques: Lessons Learned with Two Agricultural System Models - (Abstract)

Ascough Ii, J.C., Ma, L. 2004. Practical application of sensitivity and uncertainty analysis techniques: lessons learned with two agricultural system models. Meeting Abstract. www.asa-cssa-ssa.org/anmeet. Seattle, WA. Oct.31-11/4/2004.

Practical Application of Sensitivity and Uncertainty Analysis Techniques: Lessons Learned with Two Agricultural System Models - (Abstract)

Ascough Ii, J.C., Ma, L. 2004. Practical application of sensitivity and uncertainty analysis techniques: lessons learned with two agricultural system models. ASA-CSSA-SSSA Annual Meeting Abstracts. Oct. 31 - Nov. 4 2004.

Model Parameters for Agricultural Systems with Nonlinear Process Interations and Spatial Variability - (Abstract)

Green, T.R., Ahuja, L.R., Ascough II, J.C., Ma, L., Erskine, R.H., McMaster, G.S. 2004. Model parameters for agricultural systems with nonlinear process interations and spatial variability. Agronomy Abstracts a04-5627. (CD-ROM). 2004.

The Future of Spatial Modeling at Gpsru - (Abstract)

Ascough Ii, J.C., Green, T.R., Ahuja, L.R., Mcmaster, G.S., Ma, L. 2004. The future of spatial modeling at GPSRU. Workshop Proceedings. Intl. Workshop on Applications, Enhancements, and Collaboration of ARS RZWQM and GPSFARM Models, April 20 - 22, 2004, Fort Collins, CO.

Model Parameterization at Different Scales: How Do We Estimate and Incorporate Spatial Information? - (Abstract)

Green, T.R., Ascough Ii, J.C., Ahuja, L.R., Ma, L., Erskine, R.H. 2004. Model parameterization at different scales: how do we estimate and incorporate spatial information?. Intl. Workshop on Applications, Enhancements and Collaboration of ARS RZWQM and GPFARM Models, April 20-22, 2004, Fort Collins, CO.

Space-Time Modeling of Agricultural Landscape Variability Using Agsimgis - (Proceedings/Symposium)

Ascough Ii, J.C., Green, T.R., Cipra, J.E., Ahuja, L.R., Ma, L. 2004. Space-time modeling of agricultural landscape variability using agsimgis. Annual Hydrology Days Conference Proceedings. March 10-12, 2004. Fort Collins, CO. pp. 10-21.

Developing Natural Resource Models Using the Object Modeling System: Feasibility and Challenges - (Proceedings/Symposium)

Ahuja, L.R., David, O., Ascough Ii, J.C. 2004. Developing natural resource models using the object modeling system: feasibility and challenges. Meeting Proceedings. International Environmental Modelling and Software Society (IEMSS) 2004 Conference - Complexity and Integrated Resources Management, Osnabruck, Germany. June 14-17, 2004.

Terrain-Based Scaling and Simulation of Cropping Systems - (Abstract)

Green, T.R., Erskine, R.H., Ascough Ii, J.C., Ahuja, L.R., Salas, J.D., Martinez, A. 2003. Terrain-based scaling and simulation of cropping systems. Meeting Proceedings. Integrative Modelling of Sustanable Land Use, ETH Zurich, Nov 24-25, 2003.

Gpfarm Plant Model Parameters: Complications of Varieties and the Genotype X Environment Interaction in Wheat - (Peer Reviewed Journal)

MCMASTER, G.S., ASCOUGH II, J.C., SHAFFER, M.J., DEER ASCOUGH, L.A., BYRNE, P.F., NIELSEN, D.C., HALEY, S.D., ANDALES, A.A., DUNN, G.H. GPFARM PLANT MODEL PARAMETERS: COMPLICATIONS OF VARIETIES AND THE GENOTYPE X ENVIRONMENT INTERACTION IN WHEAT. TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. 2003.

Gpfarm Cycling of Crop Residues - (Abstract)

Shaffer, M.J., Bartling, P.N., Vigil, M.F., Mcmaster, G.S., Dunn, G.H., Ascough Ii, J.C., Ahuja, L.R. 2002. Gpfarm cycling of crop residues. American Society of Agronomy Meetings. Indianapolis, IN. November 10-14, 2002.

Parameterizing Gpfarm: An Agricultural Decision Support System for Integrating Science, Economics, Resource Use, and Environmental Impacts - (Proceedings/Symposium)

Mcmaster, G.S., Ascough Ii, J.C., Shaffer, M.J., Byrne, P.F., Haley, S.D., Nielsen, D.C., Andales, A.A., Dunn, G.H., Weltz, M.A., Ahuja, L.R. 2002. Parameterizing gpfarm: an agricultural decision support system for integrating science, economics, resource use, and environmental impacts. International Society of Ecological Modeling Annual Meetings. IN: A.E. Rizzoli and A.J. Jakeman (Eds.), Integrated Assessment and Decision Support Proceedings of the 1st Biennial Meeting of the IEMSS. June 24-27, 2002, Lugano, Switzerland. Vol. 1, pg 72-77.

Topographic Analysis, Scaling and Models to Evaluate Spatial/temporal Variability of Landscape Processes and Management - (Book/Chapter)

Ahuja, L.R., Green, T.R., Erskine, R.H., Ma, L., Ascough Ii, J.C., Dunn, G.H., Shaffer, M.J., Martinez, A. 2002. Topographic analysis, scaling and models to evaluate spatial/temporal variability of landscape processes and management. CRC Book: Agricultural Sys Models in Field Research and Technology Transfer. April 2002. Chapter 13, pp 265-272.

Using the Gpfarm Dss for Evaluating Dryland Cropping System Production and Economics in the Westcentral Great Plains - (Abstract)

2000 Annual Meetings Abstracts, American Society of Agronomy/Crop Science Society of America/Soil Science Society of America. Minneapolis, Minnesota, November 5-9, 2000. pp 22.