The Dryland Agroecosystems Project was a 36-year replicated agricultural experiment established in 1986 to evaluate the impacts of dryland cropping system intensification within no-till management systems through a partnership between Colorado State University and USDA-Agricultural Research Service. It was a unique long-term study in that the treatments were replicated at three sites along a north-south evapotranspiration-precipitation gradient in Eastern Colorado. Each site had replicated strips of different cropping systems across a topographical gradient (slope) and treatments ranged from traditional wheat-fallow systems to wheat-corn-fallow rotations and a variety of continuous cropping rotation systems.

The DAP has impacted dryland cropping practices across the region and supported a huge diversity of research projects. 

Peer-reviewd publications from the DAP plots (1990-2022)
  1. Liptzin, D., Norris, C. E., Cappellazzi, S. B., Bean, G. M., Cope, M., Greub, K. L. H., Rieke, E. L., Tracy, P. W., Aberle, E., Ashworth, A., Bañuelos Tavarez, O., Bary, A. I., Baumhardt, R. L., Borbón Gracia, A., Brainard, D. C., Brennan, J. R., Briones Reyes, D., Bruhjell, D., Carlyle, C. N., … Honeycutt, C. W. (2022). An evaluation of carbon indicators of soil health in long-term agricultural experiments. Soil Biology and Biochemistry, 172, 108708. https://doi.org/10.1016/j.soilbio.2022.108708 
  2. Rieke, E. L., Bagnall, D. K., Morgan, C. L. S., Flynn, K. D., Howe, J. A., Greub, K. L. H., mac Bean, G., Cappellazzi, S. B., Cope, M., Liptzin, D., Norris, C. E., Tracy, P. W., Aberle, E., Ashworth, A., Bañuelos Tavarez, O., Bary, A. I., Baumhardt, R. L., Borbón Gracia, A., Brainard, D. C., … Honeycutt, C. W. (2022). Evaluation of aggregate stability methods for soil health. Geoderma, 428. https://doi.org/10.1016/j.geoderma.2022.116156
  3. Peterson, G. A., Westfall, D. G., Schipanski, M. E., & Fonte, S. J. (2020). Soil and crop management systems that ameliorate damage caused by decades of dryland agroecosystem mismanagement. Agronomy Journal, 112(5), 3227–3238. https://doi.org/10.1002/agj2.20257
  4. Kelly, C., Schipanski, M., Kondratieff, B., Sherrod, L., Schneekloth, J., & Fonte, S. J. (2020). The effects of dryland cropping system intensity on soil function and associated changes in macrofauna communities. Soil Science Society of America Journal, 84(6), 1854–1870. https://doi.org/10.1002/saj2.20133
  5. Rosenzweig, S. T., Carolan, M. S., & Schipanski, M. E. (2020). A Dryland Cropping Revolution? Linking an Emerging Soil Health Paradigm with Shifting Social Fields among Wheat Growers of the High Plains. Rural Sociology, 85(2), 545–574. https://doi.org/10.1111/ruso.12304
  6. Rosenzweig, S. T., & Schipanski, M. E. (2019). Landscape-scale cropping changes in the High Plains: economic and environmental implications. Environmental Research Letters, 14(12), 124088.
  7. Rosenzweig, S. T., Stromberger, M. E., & Schipanski, M. E. (2018). Intensified dryland crop rotations support greater grain production with fewer inputs. Agriculture, Ecosystems and Environment, 264, 63–72. https://doi.org/10.1016/j.agee.2018.05.017
  8. Robertson, A. D., Zhang, Y., Sherrod, L. A., Rosenzweig, S. T., Ma, L., Ahuja, L., & Schipanski, M. E. (2018). Climate Change Impacts on Yields and Soil Carbon in Row Crop Dryland Agriculture. Journal of Environmental Quality, 47(4), 684–694. https://doi.org/10.2134/jeq2017.08.0309
  9. Rosenzweig, S. T., Fonte, S. J., & Schipanski, M. E. (2018). Intensifying rotations increases soil carbon, fungi, and aggregation in semi-arid agroecosystems. Agriculture, Ecosystems and Environment, 258, 14–22. https://doi.org/10.1016/j.agee.2018.01.016
  10. Sherrod, L. A., McMaster, G. S., Delgado, J. A., Schipanski, M. E., Fonte, S. . J., Montenieri, R. L., & Larson, K. (2018). Soil Carbon Pools in Dryland Agroecosystems as Affected by Several Years of Drought. Journal of Environmental Quality, 47(4), 766–773. https://doi.org/10.2134/jeq2017.09.0371
  11. Hansen, N. C. (2015). Blue water demand for sustainable intensification. Agronomy Journal, 107(4), 1539-1543.
  12. Sherrod, L. A., Ahuja, L. R., Hansen, N. C., Ascough, J. C., Westfall, D. G., & Peterson, G. A. (2014). Soil and rainfall factors influencing yields of a dryland cropping system in Colorado. Agronomy Journal, 106(4), 1179–1192. https://doi.org/10.2134/agronj13.0520
  13. Shaver, T. M., G. A. Peterson, L. R. Ahuja, and D. G. Westfall.  2013.  Soil sorptivity enhancement with crop residue accumulation in semiarid dryland no-till agroecosystems.  Geoderma 192:254-258     
  14. Sherrod, L.A., J.D. Reeder, W. Hunter, L.R. Ahuja. 2012. A Rapid and Cost Effective Method for Soil Carbon Mineralization in Static Laboratory Incubations.  Comm. Soil Sci. Plant Anal 43:958-972.         
  15. Stromberger, Mary E., Zahir Shah, and Dwayne G. Westfall.  2011.  High specific activity in low microbial biomass soils across a no-till evapotranspiration gradient in Colorado. Soil Biology & Biochemistry 43:97-105.             
  16. Westfall, D. G., G. A. Peterson, and N. C. Hansen.  2010.  Conserving and optimizing limited water for crop production. J. Crop Improvement. 24: 70-84. 
  17. Ascough II, J.C., A.A. Andales, L.A. Sherrod, G.S. McMaster, N.C. Hansen, K.C. Dejonge, E.M. Fathelrahman, L.R. Ahuja, G.A. Peterson, D.L. Hoag.  2010.  Simulating Landscape Catena Effects in No-Till Dryland Agroecosystems Using GPFARM. Agric.Sys. 103:569-584.     
  18. Stromberger, Mary, Zahir Shah, and D. G. Westfall.  2007.  Soil microbial communities of no-till dryland cropping systems across an evapotranspiration gradient.  Appl. Ecology 35:94-106.       
  19. Ascough II, J.C., G.S. McMaster,  A.A. Andales, N.C. Hansen, L.R. Ahuja, L.A. Sherrod. 2007.  Evaluating GPFARM for No-Tillage Dryland Experimental Sites in Eastern Colorado.  Transactions of the ASABE 50:1565-1578.        
  20. Cantero-Martinez, C., D. G. Westfall, L. A. Sherrod, and G. A. Peterson.  2006.  Long-term crop residue dynamics in no-till cropping systems under semi-arid conditions.  J. of Soil and Water Cons. 61:84-95.   
  21. Ortega. R. A., D. G. Westfall, and G. A. Peterson.  2005.  Climactic gradient, cropping system, and crop residue effects on carbon and nitrogen mineralization in no-till soils.  Comm. Soil Sci. Plant Anal. 36:2875-2888.
  22. Sherrod, L. A., G. A. Peterson, D. G. Westfall, and L. R. Ahuja.  2005.  Soil carbon pools after 12 years in no-till dryland Agroecosystem.  Soil Sci. Soc. Am. J. 69:1600-1608.          
  23. Mosier, A.R., A.D. Halvorson, G.A. Peterson, G.P. Robertson, and L.A. Sherrod. 2005.  Measurement of net global warming potential in three agroecosystems. Nutrient Cycling in Agroecosystems 7:67-76.        
  24. Campbell, C.A., H.H. Janzen, K. Paustian, E.G. Gregorich, L. Sherrod, B.C. Liang, and R.P. Zentner.  2005.  Carbon Storage in Soils of the North American Great Plains:  Effect of Cropping Frequency.  Agron. J. 97:349-363.      
  25. Peterson, G. A., and D. G. Westfall.  2004.  Managing precipitation use in sustainable dryland agroecosystems.  Ann. Appl. Biol. 144:127-138.            
  26. Andales, A.A., Ahuja, L.R., and Peterson, G.A. 2003. Evaluation of GPFARM for dryland cropping systems in eastern Colorado. Agron. J. 95:1510-1524.
  27. Johnson, C.K., Eskridge K.M., Wienhold, B.J., Doran, J.W., Peterson, G.A., and Buchleiter, G.W. 2003. Using electrical conductivity classification and within-field variability to design field-scale research. Agron. J. 95:602-613.      
  28. Sherrod, L.A., Peterson, G.A., Westfall, D.G., and Ahuja, L.R. 2003. Cropping intensity enhances soil organic carbon and nitrogen in a no-till agroecosystem. Soil Sci. Soc. Am. J. 67:1533-1543.
  29. Shaver, T.M., Peterson, G.A., and Sherrod, L.A. 2003. Cropping intensification in dryland systems improves soil physical properties: regression relationships. Geoderma 116:149-164.          
  30. Grant, C.A., Peterson, G.A., and Campbell, C.A. 2002. Nutrient considerations for diversified cropping systems in         the Northern Great Plains. Agron. J. 94:186-198.
  31. Del Grosso, S., Ojima, D.S. Parton, W.J. Mosier, A.R., Peterson, G.A., and Schimel, D.S. 2002. Simulated effects of dryland cropping intensification on soil organic matter and greenhouse gas exchanges using the DAYCENT ecosystem model.  Environmental Pollution 116:S75-S83.  
  32. Del Grosso, S., Ojima, D.S., Parton, W.J. Mosier, and Peterson, G.A. 2002. Regional assessment of net greenhouse gas fluxes from agricultural soils in the USA Great Plains under current and improved management. p. 469-474. In:Van Ham and Williams-Jacobse (eds.) Non-CO2 Greenhouse Gases. Millpress, Rotterdam.     
  33. Del Grosso, S., Parton, W.J. Mosier, A.R., Hartman, M.D., Keough, C.A., Peterson, G.A., Ojima, D.S., and Schimel, D.S. 2001.  Simulated effects of land use, soil texture, and precipitation on N gas emissions using DAYCENT. p. 413-431. In: Follett, R.F. and Hatfield, J.L. (eds.) Nitrogen in the Environment: Sources, Problems, and Management. Elsevier, Amsterdam.          
  34. Halvorson, A.D., Peterson, G.A., and Reule, C.A. 2002. Tillage system and crop rotation effects on dryland crop yields and soil carbon in the Central Great Plains. Agron. J. 94:1429-1436.          
  35. Ortega, R.A., Peterson, G.A., and Westfall, D.G. 2002. Residue accumulation and changes in soil organic matter as affected by cropping intensity in no-till dryland agroecosystems. Agron. J. 94:944-954.     
  36. Shaver, T.M., Peterson, G.A., Ahuja, L.R., Westfall, D.G., Sherrod, L.A., and Dunn, G. 2002. Surface soil physical properties after twelve years of dryland no-till management. Soil Sci. Soc. Am. J. 66:1296-1303.    
  37. Sherrod, L.A., Dunn, G., Peterson, G.A., and Kolberg, R.L. 2002. Inorganic carbon analysis by modified pressure-calcimeter method. Soil Sci. Soc. Am. J. 66:299-305.         
  38. Grant, C.A., Peterson, G.A., and Campbell, C.A. 2002. Nutrient considerations for diversified cropping systems in the Northern Great Plains. Agron. J. 94:186-198.
  39. Del Grosso, S., Ojima, D.S. Parton, W.J. Mosier, A.R., Peterson, G.A., and Schimel, D.S. 2002. Simulated effects of dryland cropping intensification on soil organic matter and greenhouse gas exchanges using the DAYCENT ecosystem model.  Environmental Pollution 116:S75-S83.  
  40. Del Grosso, S., Ojima, D.S., Parton, W.J. Mosier, and Peterson, G.A. 2002. Regional assessment of net greenhouse gas fluxes from agricultural soils in the USA Great Plains under current and improved management. p. 469-474. In:Van Ham and Williams-Jacobse (eds.) Non-CO2 Greenhouse Gases. Millpress, Rotterdam.     
  41. Del Grosso, S., Parton, W.J. Mosier, A.R., Hartman, M.D., Keough, C.A., Peterson, G.A., Ojima, D.S., and Schimel, D.S. 2001.  Simulated effects of land use, soil texture, and precipitation on N gas emissions using DAYCENT. p. 413-431. In: Follett, R.F. and Hatfield, J.L. (eds.) Nitrogen in the Environment: Sources, Problems, and Management. Elsevier, Amsterdam.          
  42. Frey, S.D., E.T. Elliott, K. Paustian, and G.A. Peterson. 2000.  Fungal translocation as a mechanism for soil nitrogen inputs to surface residue decomposition in a no-tillage agroecosystem.  Soil Biol. and Biochem. 32:689-698.          
  43. Ma, L., G.A. Peterson, L.R. Ahuja, L. Sherrod, M.J. Shafer, and K.W. Rojas. 1999. Decomposition of surface crop residues in long-term studies of dryland agroecosystems. Agron. J. 91:401-409.        
  44. Farahani, H.J., G.W. Buchleiter, L.R. Ahuja, G.A. Peterson, and L. Sherrod. 1999. Season evaluation of the root zone water quality model in Colorado. Agron. J. 91:212-219.        
  45. Power, J.F. and G.A. Peterson. 1998. Nitrogen transformations, utilization, and conservation as affected by fallow tillage method. Soil and Tillage Res. 49:37-47.
  46. Farahani, H.J., G.A. Peterson, D.G. Westfall, and L.R. Ahuja. 1998.  Soil water storage in dryland cropping systems: The significance of cropping intensification.  Soil Sci. Soc. Am. J. 62:984-991.    
  47. Peterson, G.A., A.D Halvorson, J.L. Havlin, O.R. Jones,  D.J. Lyon, and D.L. Tanaka. 1998. Reduced tillage and increasing cropping intensity in the Great Plains conserves soil carbon. Soil and Tillage Res. 47:207-218.   
  48. McGee, E.A., G.A. Peterson, and D.G. Westfall. 1997.  Water storage efficiency in no-till dryland cropping systems. J. Soil and Water Cons. 52:131-136.     
  49. Kolberg R.L., B. Roupett, D.G. Westfall, and G.A. Peterson. 1997.  Evaluation of an in situ net nitrogen mineralization method in dryland agroecosystems.  Soil Sci. Soc. Am. J. 61:504-508.  
  50. Paul, E.A., R.F. Follett, S.W. Leavitt, A.D. Halvorson, G.A. Peterson, and D. Lyon. 1997. Carbon isotope ratios of Great Plains soils in wheat-fallow systems. Soil Sci. Soc. Am. J. 61:1058-1067.
  51. Follett, R.F., E.A. Paul, S.W. Leavitt, A.D. Halvorson, D. Lyon, and G.A. Peterson. 1997. Carbon isotope ratios of Great Plains soils in wheat-fallow systems. Soil Sci. Soc. Am. J. 61:1068-1077.
  52. Kolberg, R.L., N.R. Kitchen, D.G. Westfall, and G.A. Peterson. 1996.  Cropping intensity and nitrogen management impact on dryland no-till rotations in the semi-arid western Great Plains.  J. Prod. Agric. 9:517-522.
  53. Paustian, K.A., E.T. Elliott, G.A. Peterson, and K. Kendrick. 1996. Modeling climate, CO2 and management impacts on soil carbon in semi-arid agroecosystems. Plant and Soil 187:351-365.            
  54. Westfall, D.G., J.L. Havlin, G.W. Hergert, and W.R. Raun. 1996. Nitrogen management in dryland cropping systems. J. of Prod. Agric. 9:192-199.            
  55. Peterson, G.A., A.J. Schlegel, D.L. Tanaka, and O.R. Jones. 1996. Precipitation use efficiency as affected by cropping and tillage systems.  J. of Prod. Agric. 9:180-186.          
  56. Evans, S.D., G.A. Peterson, D.G. Westfall and E. McGee. 1994. Nitrate leaching in dryland agroecosystems as influenced by soil and climate gradients. J. Environ. Qual. 23:999-1005.      
  57. Peterson, G.A., D.G. Westfall, and C.V. Cole. 1993.  Agroecosystem approach to soil and crop management research. Soil Sci. Soc. Am. J. 57:1354-1360.
  58. Moore, I.D., P.E. Gessler, G.A. Nielsen, and G.A. Peterson. 1993.  Soil attribute prediction using terrain analysis. Soil Sci. Soc. Am. J. 57:443-452.     
  59. Wood, C. W., G. A. Peterson, D. G. Westfall, C. V. Cole and W. F. Willis.  1991.  Nitrogen balance and biomass production of newly established no-till dryland agroecosystems.  Agron. J. 83:519-526.        
  60. Wood, C. W., D. G. Westfall and G. A. Peterson.  1991.  Soil carbon and nitrogen changes upon initiation of no-till cropping systems in the West Central Great Plains.  Soil Sci. Soc. Am. J.  55:470-476.      
  61. Wood, C. W., D. G. Westfall, G. A. Peterson and I. C. Burke.  1990.  Impacts of cropping intensity on carbon and nitrogen mineralization under no-till agroecosystems.  Agron. J. 82: 1115-1120.     
  62. Kitchen, N. R., J. L. Havlin and D. G. Westfall.  1990.  Soil sampling under no-till banded phosphorus.  Soil Sci. Soc. Am. J. 54:1661-1665.   
  63. Kitchen, N. R., L. A. Sherrod, C. W. Wood, G. A. Peterson and D. G. Westfall.  1990.  Nitrogen contamination of soils from sampling bags.  Agron. J.  82:354-356.  

Other resources published from the DAP up through 2013
   
Chapters in Books or Monographs:
Peterson, G.A. 1994. Interactions of surface residues with soil and climate. p. 9-12.  IN: W.C. Moldenhauer and A.L. Black (eds.) Crop residue management to reduce erosion and improve soil quality: Northern Great Plains. USDA/ARS Cons. Res. Report No. 38. Washington, D.C.
Westfall, D.G., W.R. Raun, J.L. Havlin, G.V. Johnson, J.E. Matocha, and F.M. Hons. 1994. Fertilizer management. p. 33-36.  IN: B.A. Stewart and W.C. Moldenhauer (eds.) Crop residue management to reduce erosion and improve soil quality: Southern Great Plains. USDA/ARS Cons. Res. Report No. 37. Washington, D.C.
Metherell, A.K., C.A. Cambardella, W.J. Parton, G.A. Peterson, L.A. Harding, and C.V. Cole. 1995. Simulation of soil organic matter dynamics in dryland winter wheat-fallow cropping systems. p.259-270. IN: Soil management and greenhouse effect. R. Lal, J. Kimble, E. Levine, and B.A. Stewart. (eds.) Lewis Publishers, Boca Raton, FL.
Peterson, G.A. and D.G. Westfall. 1997. Management of dryland agroecosystems in the Central Great Plains of Colorado. p.371-380. IN: Soil organic matter in temperate agroecosystems. Paul, E.A., K.A. Paustian, E.T. Elliot, and C.V. Cole. (eds.) Lewis Publishers, Boca Raton, FL.
Halvorson, A.D., M.F. Vigil, G.A. Peterson, and E.T. Elliott. 1997. Long-term tillage and crop residue management study at Akron, Colorado. p.361-370. IN: Soil organic matter in temperate agroecosystems. Paul, E.A., K.A. Paustian, E.T. Elliot, and C.V. Cole. (eds.) Lewis Publishers, Boca Raton, FL. Farahani, H.J., G.A. Peterson, and D.G. Westfall. 1998. Dryland cropping intensification: A fundamental solution to efficient use of precipitation. Advances in Agron. 64:197-223.
Bradford, J.M. and G.A. Peterson. 1999. Conservation Tillage. p. G247-G270 IN: M.E. Sumner (ed.) Handbook of Soil Science. CRC Press, Boca Raton, FL.
Westfall, D. G., G.A. Peterson, and N.C. Hansen.  2010.  Conserving and optimizing limited water for crop production.  p. 43-55.  In Water and Agricultural Sustainability Strategies.  M. S. Kang (Ed.) Taylor and Francis Publishing.
Peterson, G.A., D.G. Westfall, and  N.C. Hansen. 2012. Enhancing Precipitation Use Efficiency in the World’s Dryland Agroecosystems. Adv. in Soil Sci. CRC Press, Boca Raton, FL.


Publications in Proceedings:
Peterson, G. A. and D. G. Westfall.  1987.  Integrated research in soil and crop management.  p. 3‑5. IN: Proc. Western Phosphate Conf.  March 1987.  Corvallis, OR.
Kitchen, N. R. , D. G. Westfall and G. A. Peterson.  1988.  Nitrogen fertilizer use efficiency in dryland no-till crop rotations.  p. 172-179.  IN: 1988 Symposium Proc.  Fluid Fertilizer Research as a Basis for Efficient Crop Production.  March 15-17, 1988.
Wood, C. W., D. G. Westfall and J. M. Ward.  1988.  Phosphorus placement in dryland winter wheat. IN: Proc. Great Plains Soil Fert. Workshop 2:79-83.
Peterson, G. A., D. G. Westfall and W. O. Willis.  1988.  Systems research:  a necessity for the future of agronomic research.  p. 739-740. IN: Proc. Int. Conf. Dryland Farming, Aug. 15-19, 1988.  Amarillo, TX.
Kitchen, N. R., D. G. Westfall and G. A. Peterson.  1988.  Nitrogen fertilizer use efficiency in dryland no-till crop rotations.  p. 223-229.  IN: Proc. Fluid Fert. Found. Symp., March, 1988, Scottsdale, AZ.
Westfall, D. G. and G. A. Peterson.  1989.  Long-term dryland cropping systems research for the Central Great Plains.  p. 1.  IN: Proc. Western Soc. Soil Sci. Bozeman, MT, June 20-22, 1989. 
Peterson, G. A. and D. G. Westfall.  1990.  Long-term soil-crop management research for the 21st century.  p. 132-136.  IN: Proc. Great Plains Soil Fert. Conf., Denver, CO, March 6-7, 1990.
Kitchen, N. R., D. G. Westfall, G. A. Peterson and J. L. Havlin.  1990.  Soil sampling under no-till banded phosphorus fertilizer.  p. 159-164.  IN:Proc. Great Plains Soil Fert. Conf., Denver, CO, March 6-7, 1990.
Kitchen, N. R., D. G. Westfall and G. A. Peterson.  1990.  Fertilizer use efficiency in dryland no-till crop rotations. p. 218-227.  IN: Proc. Fluid Fert. Found., Scottsdale, AZ, March 13-15, 1990.
Peterson, G. A. and D. G. Westfall.  1990.  Dryland cropping systems to enhance water quality. p. 93-104.  IN: Proc. Non-point Water Quality Symp., Colorado Springs, CO, March 22-23, 1990.
Westfall, D. G. and G. A. Peterson.  1990.  Nitrogen efficiency in dryland agroecosystems.  p. 155-163. IN: Proc. Great Plains Conserv. Tillage Symp.  Great Plains Agricultural Council Bulletin No. 131.  Bismarck, ND, August 21-23, 1990.
Peterson, G. A. and D. G. Westfall.  1990.  Sustainable dryland agroecosystems. p. 23-29. IN: Proc. Great Plains Conserv. Tillage Symp. Great Plains Agricultural Council Bulletin No. 131.  Bismarck, ND, Aug. 21-23, 1990.
Peterson, G.A..  1991.  Soil and crop management as a driving variable. p. 255. IN: J.D. Hanson, M.J. Shaffer, D.A. Ball and C.V. Cole (eds.), Sustainable Agriculture for the Great Plains, Symposium Proceedings. USDA-ARS, ARS-89.
Westfall, D.G. and G.A. Peterson.  1991. Optimum production and nitrogen fertilizer use in dryland no-till crop rotations. p.48.  IN: Proc. Pacific Div. AAAS, June 23-27, 1991, Logan, UT.
Westfall, D.G., R.L. Kolberg, N.R. Kitchen, and G.A. Peterson.  1991.  Nitrogen fertilizer use efficiency in dryland no-till crop rotations. p. 260-270.  IN: Proc. Fluid Fert. Found. Symp., March 1991, Scottsdale, AZ.
Peterson, G.A., D.G. Westfall, and A.D. Halvorson.  1992.  Economics of dryland crop rotations for efficient water and nitrogen use. p. 47-53. IN:Proc. Great Plains Soil Fert. Conf., Denver, CO, March 3-4, 1992.
Westfall, D.G., R.L. Kolberg, and G.A. Peterson.  1992.  Nitrogen fertilizer use efficiency in dryland no-till crop rotations. p. 244-257.  IN: Proc. Fluid Fert. Found. Symp., March 1992, Scottsdale, AZ.
Peterson, G.A., and C.V. Cole.  1993.  Productivity of Great Plains soils:  Past, present and future.  IN: Proceedings of the Great Plains Ecosystems Symposium. Kansas City, MO. 7-9 April 1993.
Moore, I.D., P.E. Gessler, G.A. Nielsen, and G.A. Peterson.  1993.  Soil attribute prediction using terrain analysis. p. 27-55.  IN: Robert, P.C., et al. (eds.) Proc. of Workshop: Soil Specific Crop Management. Minneapolis, MN. 14-16 April 1992. Am. Soc. of Agron. Madison, WI.
Westfall, D.G., R.L. Kolberg, and G.A. Peterson.  1993. Nitrogen fertilizer use efficiency in dryland no-till crop rotations. p. 153-163.  IN: Proc. Fluid Fert. Found. Symp. March 1993. Scottsdale, AZ.
Westfall, D.G., G.A. Peterson, and  R.L. Kolberg.  1994.  Fluid systems for dryland agriculture.  p. 129-134.  IN: Proc. Fluid Fert. Found. Symp. “Research for Tomorrow” February 1994. Scottsdale, AZ.
Westfall, D.G., R.L. Kolberg, and G.A. Peterson.  1994.  Nitrogen management for intensified dryland agroecosystems. p. 12-17.  IN: Proc. Great Plains Soil Fertility Conference. 7-9 March 1994. Denver, CO.
Peterson, G.A., D.G. Westfall, N.E. Toman, and R. E. Anderson.  1994.  Sustainable dryland cropping systems: Economic analysis.  p. 30-35.  IN: Proc. Great Plains Soil Fertility Conference. 7-9 March 1994. Denver, CO.
Rouppet, B., R.L. Kolberg, R.L. Waskom, D.G. Westfall, and G.A. Peterson.  1994.  In-situ soil nitrogen mineralization methodology. p. 30-35.  IN: Proc. Great Plains Soil Fertility Conference. 7-9 March 1994. Denver, CO.
Peterson, G.A. and D.G. Westfall.  1994.  Intensified cropping systems: The key to environmental and 
economic sustainablity in the Great Plains. p. 73-84.  IN: Proc. Intensive Wheat Management Conference. 10-11 March 1994. Denver, CO.
Peterson, G.A. and D.G. Westfall.  1994.  Economic and environmental impact of intensive cropping systems - Semiarid region. p. 145-158.  IN: Proc. Nutrient Management on Highly Productive Soils Conference. 16-18 May 1994. Atlanta, GA.
Westfall, D.G., G.A. Peterson, and R.L. Kolberg.  1994.  Nitrogen and phosphorus management of dryland cropping systems. p. 35-41. IN: Proc. Great Plains Residue Management Conference. GPAC Bull. No. 150. 15-17 August 1994. Amarillo, TX.
Peterson, G.A., D.G. Westfall, and L. Ahuja. 1995. Sustainable dryland agroecosystems for the Great Plains.  IN: Proc. Planning for a Sustainable Future: The case of the North American Great Plains Symposium.  8-10 May 1995. Lincoln, NE.
Peterson, G.A., D.G. Westfall, and R.L. Kolberg. 1995. Fertilidad en trigo y otros cultivos en areas secas. p. 119-130. IN: Fertilidad de Suelos, Fertilizacion y Siembra Directa. III Jornadas Regionales Symposium. September 1995. Sierra la Ventana, Argentina.
Westfall, D.G., G.A. Peterson, and R.L. Kolberg. 1995. Fluid systems for dryland agriculture. p. 127-140. IN: 1995 Fluid Forum Proc.  Sponsored by Fluid Fertilizer Foundation. February 1995, Scottsdale, AZ.
Westfall, D.G., G.A. Peterson, and R.L. Kolberg. 1995. Sustainable dryland cropping systems.      IN: Proc. Western Nutrient Management Conf. 1:101-105. 9-10 March 1995. Salt Lake City, UT.
Peterson, G.A. 1996. Nitrogen fertilizer management for Great Plains dryland cropping systems: A review. p.19-25.   IN: Proc. Great Plains Soil Fertility Conference. 5-6 March 1996. Denver, CO.
Westfall, D.G., G.A. Peterson, and R.L. Kolberg. 1996. Fluid systems for dryland agriculture. p.102-112. IN: 1996 Fluid Forum Proc.  Sponsored by Fluid Fertilizer Foundation. February 1996, Scottsdale, AZ.
Westfall, D.G. and G.A. Peterson. 1996. Post CRP nitrogen management in dryland cropping systems. p.6 IN CRP Conference Proceedings. CRP Conference. Amarillo, TX.
Ortega, R.A., D.G. Westfall, and G.A. Peterson. 1996. Crop residue distribution and activity in soils as affected by cropping intensity in no-till dryland agroecosystems. p.75-82. IN Proc. Great Plains Soil Fertility Conference. 5-6 March 1996. Denver, CO.
Westfall, D.G., R.L. Kolberg, and G.A. Peterson. 1996. Nitrogen fertilization of intensive cropping systems. p.48-57. IN: 1996 Proc. AgriFuture Farm Technology Expo and Convention Workshop. February 1996. Red Deer, Alberta.
Westfall, D.G. and G.A. Peterson. 1996. Managing the move to more intensive cropping.  p.14-22. IN: 1996 Proc. AgriFuture Farm Technology Expo and Convention Workshop. February 1996. Red Deer, Alberta.
Peterson, G.A. and D.G. Westfall. 1997.  Benefits of zero till and rotations in the North American Great Plains. p. 5-16. IN: Proc. of the 19th Annual Manitoba-North Dakota Zero Tillage Workshop. 27-29 Jan. 1997, Brandon, Manitoba, Canada.
Ortega, R. A., D.G. Westfall, and G.A. Peterson. 1997.  Using natural soil variability to calibrate soil tests.  p. 14-31. IN: 1997 Fluid Forum Proc.  Sponsored by the Fluid Fertilizer foundation, February, 23-25, 1997, Scottsdale, AZ.
Ortega, R. A., D.G. Westfall, and G.A. Peterson. 1997.  Spatial variability of soil P and its impact on dryland winter wheat yields.  p. 150-159. IN: Proc. of the Western Nutrient Management Conf.  March 6-7, 1997.  Salt Lake City, UT.
Peterson, G. A. and D.G. Westfall. 1997. Crop water extraction patterns across soil types. p. 41-48. IN: Proc. of the Ninth Ann. Conf. of the Colorado Cons. Tillage Assn. February 4-5, 1997. Sterling, CO.
Westfall, D.G., M. Amrani, and G.A. Peterson. 1998. Availability of zinc in fertilizers as influenced by water-solubility. p. 7-12.  IN: Great Plains Soil Fertility Conference Proceedings.  Schlegel, A.J. (Ed.) Great Plains Soil Fertility Conference. March 1998. Denver, CO.
Sherrod, A.L., G.A. Peterson, and D.G. Westfall. 1998. No-till rotational residue dynamics across an ET gradient. p. 61-66.  IN: Great Plains Soil Fertility Conference Proceedings.  Schlegel, A.J. (Ed.) Great Plains Soil Fertility Conference. March 1998. Denver, CO.
Ortega, R.A., D.G. Westfall, and G.A. Peterson. 1998.  Using natural soil variability in landscapes: Site specific management of nitrogen on dryland corn.  p. 98-113. IN: 1998 Fluid Forum Proc.  Sponsored by the Fluid Fertilizer foundation, February, 22-25, 1998, Scottsdale, AZ.
Westfall, D.G., R.A. Ortega, and G.A. Peterson. 1998.  Landscape variability and wheat managment.  p. 1-8. IN: Proc. Intensive Wheat Mgt. Conf.  Mar 4-5, 1998, Denver, CO.  Sponsored by The Potash and Phosphate Institute.
Peterson, G.A. and D.G. Westfall. 1998. Efficient nutrient use in no-till intensively cropped dryland systems. p. 57-66. Proceedings of the 6thCongresso Nacional de AAPRESID. 19-21 August. Mar del Plata, Argentina.
Westfall, D.G., R.A. Ortega, and G.A. Peterson.  1998.  Spatial variability of soil P and its impact on dryland winter wheat yields.  V. 1, p. 301. IN:Proc 16th World Congress of Soil Science. August 20-26, 1998.  Montpellier, France.
Ortega, R.A., D.G. Westfall, G.A. Peterson, and W.J. Gangloff . 1999. Using natural variability in landscapes to calibrate soil tests. p. 64-77. IN: Proc. Fluid Forum. 21-23 Feb. 1999. Scottsdale, AZ.
Peterson, G.A. and D.G. Westfall.1999.  Adapt versus adopt: If it works in Saskatchewan why won’t it work here?. Proceedings of the 11th Annual Conference of the Colorado Tillage Association. 2-3 February 1999. Sterling, Colorado.
Sherrod, A.L., G.A. Peterson, D.G. Westfall, and L.R. Ahuja. 2000. Carbon sequestration rates after 12 years under no-till dryland cropping systems rotations. p. 75-81.  IN: Great Plains Soil Fertility Conference Proceedings.  Schlegel, A.J. (Ed.) Great Plains Soil Fertility Conference. March 2000. Denver, CO.
Peterson, G.A., D.G. Westfall, L.A. Sherrod, and T.M. Shaver. 2000. Dryland agroecosystem management for the Central Great Plains. Proceedings of Farming and Ranching for Profit, Stewardship, and Community Conference. 7-9 March 2000. Portland, OR.
Mosier, A.R., G.A. Peterson, L.A. Sherrod. 2003.  Mitigating net Global Warming Potential (CO2, CH4, and N2O Emissions) in upland Crop Production.  Methane and Nitrous Oxide International Workshop Proceedings, Nov. 17-21, Beijing, China. p. 273-280.  
Sherrod, L.A., G.A. Peterson, D.G. Westfall, and L.R. Ahuja.  2004.  Carbon Budget in Dryland Agroecosystems after 12 Years in No‑till as Affected by Climate Gradient, Slope Position, and Cropping Intensity.  In Proceedings of the 2004 Great Plains Soil Fertility Conference, Denver, CO. March 2nd & 3rd. pgs. 234‑239. 
Westfall, D. G., Carlos Cantero, G. A. Peterson, and L. Sherrod.  2006.  Effect of no-till dryland cropping systems and evapotranspiration gradient on the retention of crop residue in semi-arid environments.  Proc. Soil and Water Cons. Society Conf.  July 22-26, 2006.  Keystone, CO. Pg. 9-10.
Del Grosso, S.J., L.A. Sherrod, A. Mosier, G.A. Peterson, L.R. Ahuja, and N.C. Hansen. 2008.  Impacts of Cropping Intensity on Soil C and Net Greenhouse Gas Fluxes for Dryland Cropping in Northeastern Colorado.  Proc. Great Plains Soil Fertility Conference.  Vol. 12, pp. 40-44. 
Sherrod, L.A., L.R. Ahuja, N.C. Hansen.  2010. No-Till Cropping System Effects on Soil Profile Organic Carbon (0-24 inch) and Total Nitrogen after 7 Years of Drought.  Proc. Great Plains Fertility Conf.  Denver, CO.  March 2-3, 2010.  pp. 156-162. 
Hansen, N.C., J.G. Pritchett, D.G. Westfall, J.R. Herman, and L.A. Sherrod.  2010.  Irrigated Cropping Systems in a Water Limited Environment.  Proc. Great Plains Fertility Conf.  Denver, CO.  March 2-3, 2004.  pp. 59-64. 
Reyes-Fox, M.A., S.J. Del Grosso, L.A. Sherrod, G.A. Peterson, L.R. Ahuja, and  N.Hansen. 2012.  Can DAYCENT Represent Impacts of Slope and Cropping Intensity on Soil C and Yields For Dryland Systems in Eastern Colorado?  Proc. Great Plains Soil Fertility Conference.  Vol. 14, pp. 246-251. 
 
Technical bulletins or other reports:
Peterson, G. A., D. G. Westfall, W. Wood and S. Ross.  1988.  Crop and soil management in dryland agroecosystems.  Tech. Bull. LTB88-6. Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G. A., D. G. Westfall, C. W. Wood, L. Sherrod and E. McGee.  1989.  Crop and soil management in dryland agroecosystems. Tech. Bull. TB89-3. Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G. A., D. G. Westfall, C. W. Wood, L. Sherrod and E. McGee.  1990.  Crop and soil management in dryland agroecosystems.  Tech. Bull. TB90-1. Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G. A., D. G. Westfall, L. Sherrod, E. McGee and R. Kolberg.  1991.  Crop and soil management in dryland agroecosystems.  Tech. Bull. TB91-1. Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, E. McGee and R. Kolberg.  1992.  Crop and soil management in dryland agroecosystems.  Tech. Bul.TB92-2.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Croissant, R.L., G.A. Peterson, and D.G. Westfall.  1992.  Dryland cropping systems in eastern Colorado. Service in Action No. 516.  Cooperative Extension. Colo. State Univ. Fort Collins, CO.
Peterson, G.A., D.G. Westfall, N.E. Toman, and R.L. Anderson.  1993.  Sustainable dryland cropping systems: Economic analysis.  Tech. Bul. TB93-3.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, R. Kolberg, and B. Rouppet.  1993.   Sustainable dryland  agroecosystem management.  Tech. Bul. TB93-4.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Kolberg, R.L., D.G. Westfall, G.A. Peterson, N.R. Kitchen, and L. Sherrod.  1993.  Nitrogen fertilization of dryland cropping systems.  Tech. Bul. TB93-6.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, R. Kolberg, and B. Rouppet.  1994.   Sustainable dryland  agroecosystem management.  Tech. Bul. TB94-1.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, R. Kolberg, and D. Poss. 1995. Sustainable dryland  agroecosystem management.  Tech. Bul. TB95-1.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, R. Kolberg, and D. Poss. 1996. Sustainable dryland   agroecosystem management.  Tech. Bul. TB96-1.  Colorado State University and Agricultural Experiment Station. Ft. Collins, CO. 
Nielsen, D., G.A. Peterson, R. Anderson, V. Ferreira, W. Shawcroft, and K. Remington. 1996. Estimating corn yields from precipitation records. Cons. Tillage Fact Sheet 2-96. USDA/ARS and USDA/NRCS. Akron, CO.   
Peterson, G.A., D.G. Westfall, L. Sherrod, D. Poss, K. Larson, D.Thompson, D. 1997.  Sustainable dryland agroecosystem management.  Tech. Bull. TB97-3. Colorado State University and Agricultural Experiment Station, Fort Collins, CO.
Peterson, G.A., D.G. Westfall, L. Sherrod, D. Poss, K. Larson, D. Thompson, and L.R. Ahuja. 1998.  Sustainable dryland agroecosystem management.  Tech. Bull. TB98-1. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO. 
Peterson, G.A., D.G. Westfall, F.B. Peairs, L. Sherrod, D. Poss, W. Gangloff, K. Larson, D. Thompson, L.R. Ahuja, M.D. Koch, and C.B. Walker. 1999.  Sustainable dryland agroecosystem management.  Tech. Bull. TB99-1. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
Peterson, G.A., D.G. Westfall, F.B. Peairs, L. Sherrod, D. Poss, W. Gangloff, K. Larson, D. Thompson, L.R.. Ahuja, M.D. Koch, and C.B. Walker. 2000.  Sustainable dryland agroecosystem management.  Tech. Bull. TB00-3. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
Kaan, D.A., O’Brien, D.M., Burgener, P.A., Peterson, G.A., and Westfall, D.G. 2002. An economic evaluation of alternative crop rotations compared to wheat-fallow in Northeastern Colorado. Tech. Bull. TB02‑1. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO. Kaan, D.A., O’Brien, D.M., Burgener, P.A., Peterson, G.A., and Westfall, D.G. 2002. An economic evaluation of alternative crop rotations compared to wheat-fallow in Northeastern Colorado. Tech. Bull. TB02‑1. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
Westfall, D.G., Peterson, G.A., Peairs, F.B., Sherrod, L., Poss, D., Shaver, T., Larson, K., Thompson, D., Ahuja, L.R., Koch, M.D., and C.B. Walker. 2004.  Sustainable dryland agroecosystem management.  Tech. Bull. TB04-05.  Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
Davis, J. G. and D. G. Westfall.  2009.  Corn Fertilization..  CSU Service-In-Action Sheet No.  0.538.
Westfall, D.G., G.A. Peterson, F.B. Peairs, L.A. Sherrod, D.J. Poss, T. Shaver, K. Larson, D.L. Thompson, L.R. Ahuja, M.D. Koch, and C.B. Walker, 2004.  Sustainable dryland agroecosystem management.  Experiment Station Technical Bulletin TB04-05. 
D.G. Westfall, L. Sherrod, F. B. Peairs, D. Poss, N.C. Hansen, G.A. Peterson, T. Shaver, K. Larson, D.L. Thompson, L.R. Ahuja, M.D. Koch, and C. B. Walker.  2012.  Sustainable dryland agroecosystem management.  Experiment Station Technical Bulletin TB12-01. 
Peairs, F.B., N. C. Hansen, D. Poss, D. G. Westfall, G. A. Peterson, J. C. Herman, L. Sherrod, T. M. Shaver, T. Randolph, and J. Rudolph. 2013.  Agronomic & Entomological Results from 7 years of Dryland Cropping Systems Research at Briggsdale, Colorado. Experiment Station Technical Bulletin TB13-xx.


Published Abstracts:
Peterson, G. A. and D. G. Westfall.  1987.  Integrated research: a necessity for the future of soil and crop management.  Agron. Abstracts p. 213. Amer. Soc. of Agron., Madison, WI.
Peterson, G. A., C. W. Wood and D. G. Westfall.  1988.  Building a crop residue base in no-till cropping systems.  Agron. Abstracts p. 246. Amer. Soc. of Agron., Madison, WI.
Kitchen, N. R., D. G. Westfall and G. A. Peterson.  1989.  Potential N and C mineralization in dryland no-till cropping soils as influenced by N fertilization management.  Agron. Abstracts p. 244. Amer. Soc. of Agron., Madison, WI.
Peterson, G. A., D. G. Westfall.  1989.  Long-term soil-crop management research for the 21st century.  Agron. Abstracts p. 249. Amer. Soc. of Agron., Madison, WI.
Westfall, D. G., N. R. Kitchen and J. L. Havlin.  1989.  Soil sampling procedures under no-till banded phosphorus fertility.  Agron. Abstracts p. 256. Amer. Soc. of Agron., Madison, WI.
Wood, C. W., G. A. Peterson and D. G. Westfall.  1989.  Potential C and N mineralization in dryland agroecosystems as affected by landscape position and crop rotation.  Agron. Abstracts p. 256. Amer. Soc. of Agron., Madison, WI.
Follett, R. H., G. A. Peterson, C. W. Wood and D. G. Westfall.  1989.  Developing a crop residue base to decrease erosion potential.  Abstract of the Annual Meeting of the Soil and Water Conservation Society. 30 July 1989.  Edmonton, Canada.
Kitchen, N. R., D. G. Westfall and G. A. Peterson.  1990.  Nitrogen fertilization management in no-till dryland cropping systems.  Agron. Abstracts p. 272. Amer. Soc. of Agron., Madison, WI. 
Peterson, G. A., C. W. Wood and D. G. Westfall.  1990.  Cumulative biomass production and N utilization in no-till dryland agroecosystems. Agron. Abstracts p. 322. Amer. Soc. of Agron., Madison, WI.
Wood, C. W., D. G. Westfall and G. A. Peterson.  1990.  Impact of cropping intensity under no-till on soil C and N.  Agron. Abstracts. p. 328. Amer. Soc. of Agron., Madison, WI.
Evans, S.D., G.A. Peterson, D.G. Westfall, and E.A. McGee.  1991.  Nitrate leaching in dryland agroecosystems as influenced by soil and climate gradients.  Agron. Abstracts. p.330. Amer. Soc. of Agron., Madison, WI.
McGee, E.A., G.A. Peterson, and D.G. Westfall.  1991.  Water-use efficiency of dryland no-till cropping systems in the west central Great Plains. Agron. Abstracts. p.336. Amer. Soc. of Agron., Madison, WI.
McMaster, G.S., J.A. Morgan, and G.A. Peterson.  1991.  Wheat yield components for different cropping systems, climates, and catenas. Agron. Abstracts. p.153. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., D.G. Westfall, and E.A. McGee.  1992.  Increasing productivity and sustainability of dryland agroecosystems. Abstracts of the First International Crop Science Congress. 14-22 July, 1992. Ames, Iowa. Crop Science Society of America. Madison, WI.
Westfall, D.G., and G.A. Peterson.  1992.  Sustainable dryland agroecosystems. Agron. Abstracts. p. 86. Amer. Soc. of Agron., Madison, WI.
McGee, E.A., G.A. Peterson, and D.G. Westfall.  1992.  Water-use efficiency as affected by cropping intensity, slope, and evaporative gradient in no-till dryland agroecosystems. Agron. Abstracts. p. 331. Amer. Soc. of Agron., Madison, WI.
Iremonger, C.J., D.G. Westfall, and G.A. Peterson.  1992.  Fertilizer phosphorus and cropping intensity effects on P availability. p. 86-92. IN: Proc. Western Phosphorus/Sulfur Workshop. Aug. 6-8, 1992. Anchorage, AK. 
 Peterson, G.A., D.G. Westfall, N.E. Toman, and R.L. Anderson.  1993.  Sustainable dryland cropping systems: Economic analysis. Agron. Abstracts p. 325. Amer. Soc. of Agron., Madison, WI.
Kolberg, R.L., B. Rouppet, D.G.Westfall, and G.A. Peterson.  1993.  In situ soil nitrogen mineralization methodology.  Agron. Abstracts p. 276. Amer. Soc. of Agron., Madison, WI.
Halvorson, A.D., G.A. Peterson, and S.E. Hinkle.  1993.  Tillage and cropping system effects on dryland wheat and corn production.  Agron. Abstracts p. 316. Amer. Soc. of Agron., Madison, WI.
Mrabet, R., A. Bouzza, and  G.A. Peterson.  1993.  Potential reduction in soil erosion in Morocco using no-till systems.  Agron. Abstracts p. 323. Amer. Soc. of Agron., Madison, WI.
Rouppet, B., D.G. Westfall, and G.A. Peterson.  1994.  In-situ nitrogen mineralization in no-till dryland agroecosystems. Agron. Abstracts p. 316. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., A.J. Schlegel, D.L. Tanaka, and O.R. Jones.  1994.  Precipitation use efficiency as related to cropping systems and tillage.  Agron. Abstracts p. 356. Amer. Soc. of Agron., Madison, WI.
Ortega, R.A., G.A. Peterson, and D.G. Westfall.  1994.  Net nitrogen mineralization as affected by cropping systems and residue production. Agron. Abstracts p. 372. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., D.G. Westfall, N.E. Toman and R.L. Anderson.  1994.  Sustainable dryland cropping systems on the Colorado High Plains: Economic analysis.  AAAS-WSSA Meeting Abstract. 20-23 April 1994.
Sherrod, L., G.A. Peterson, D.G. Westfall, and R.L. Kolberg. 1995. Carbon and nitrogen dynamics as affected by rotation intensity in the Great Plains. Agron. Abstracts p. 25. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., A.L. Black, A.D. Halvorson, J.L. Havlin, O.R. Jones, and D.J. Lyon. 1995. North American agricultural soil organic matter network: The American Great Plains. Agron. Abstracts p. 25. Amer. Soc. of Agron., Madison, WI.
Ortega, R.A., G.A. Peterson, and D.G. Westfall. 1995. Phosphorus test calibration using spatial variability of a landscape in eastern Colorado. Agron. Abstracts p. 268. Amer. Soc. of Agron., Madison, WI.
Rodriguez, J.B., J.R. Self, G.A. Peterson, and D.G. Westfall. 1995. Sodium bicarbonate-DTPA test for macro and micro nutrients in soils. Agron. Abstracts p. 317. Amer. Soc. of Agron., Madison, WI.
Farahani, H.J., L.A. Ahuja, G.W. Buchleiter, and G.A. Peterson. 1995. Mathematical modeling of irrigated and dryland corn production in eastern Colorado. Abstract for Clean Water-Clean Environment-21st Century Symposium. March 1995. Kansas City, MO.
Farahani, H.J., L.A. Ahuja, G.A. Peterson, R. Mrabet, and L. Sherrod. 1995. Root zone water quality model evaluation of dryland/no-till crop production in eastern Colorado.  Abstract of International Symposium on Water Quality Modeling. April 1995. Kissimmee, FL.
Peterson, G.A. and D.G. Westfall. 1995. Post-CRP land use-alternative systems.  Abstract of Symposium on Converting CRP-Land to Cropland and Grazing: Conservation Technologies of the Transition.  Sponsored by Soil and Water Cons. Soc. of Amer. 6-8 June 1995. Lincoln, NE.Sherrod, L., G.A.Peterson, and D.G. Westfall. 1996. No-till rotational residue dynamics across an ET gradient. Agron. Abstracts p. 282. Amer. Soc. of Agron., Madison, WI. 
Poss, D.J, G.A. Peterson, and D.G. Westfall. 1996. Growing annual legumes in dryland agroecosystems in northeastern Colorado. Agron. Abstracts p. 283. Amer. Soc. of Agron., Madison, WI.
Halvorson, A.D., C.A. Reule, and G.A. Peterson. 1996. Long-term N fertilization effects on soil organic C and N. Agron. Abstracts p. 276. Amer. Soc. of Agron., Madison, WI.
Kolberg, R.L., D.G. Westfall, and G.A. Peterson. 1996. Influence of cropping intensity and nitrogen fertilizer rates on In situ nitrogen mineralization. Agron. Abstracts p. 247. Amer. Soc. of Agron., Madison, WI.
Farahani, H.J., G.A. Peterson, D.G. Westfall, L.A. Sherrod, and L.A. Ahuja. 1996. The inefficiency of summer fallow in dryland no-till cropping systems. Agron. Abstracts p. 295. Amer. Soc. of Agron., Madison, WI.
Iremonger, C.J., D.G. Westfall, G.A. Peterson, and R.L. Kolberg. 1997. Nitrogen fertilizer induced soil pH drift in a no-till dryland cropping system. Agron. Abs. p.225. Amer. Soc. of Agron., Madison, WI.
Ortega, R.A., D.G. Westfall, and G.A. Peterson, G.A. 1997. Spatial variability of soil P and its impact on dryland winter wheat yields. Agron. Abs. p.231. Amer. Soc. of Agron., Madison, WI..
Peterson, G.A., D.G. Westfall, H.J. Farahani, L.A. Sherrod, and L.R. Ahuja. 1997. Enhancing productivity of central Great Plains dryland agroecosystems. Agron. Abs. p.261. Amer. Soc. of Agron., Madison, WI..
Westfall, D. G., R.A. Ortega, and G.A. Peterson. 1997.  Spatial variability of soil properties and wheat yields over landscapes.  p. 11-12. IN: Abstracts of 1st European Conf. on Precision Agr.  Sept. 7-10, 1997.  Warwick University.  
Ortega, R.A., W.J. Gangloff, D.g. Westfall, and G.A. Peterson. 1998. Multivariate approach to nitrogen recommendations for dryland corn in eastern Colorado. Agron. Abs. p.55. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., L.A. Sherrod, D.G. Westfall, and L.R. Ahuja. 1998. Intensive dryland cropping systems increase soil organic matter. Agron. Abs. p.276. Amer. Soc. of Agron., Madison, WI.
Guzman, J., G.A. Peterson, D.G. Westfall, and P.L. Chapman. 1998. Dryland corn yields as a function of weather and soil variables. Agron. Abs. p.277. Amer. Soc. of Agron., Madison, WI.
Lyon, D.J. and G.A. Peterson. 1999. Three crops in three years with no-till dryland systems in the semiarid Great Plains. Agron. Abs. p.100. Amer. Soc. of Agron., Madison, WI.
Grant, C.A., G.A. Peterson and C. A. Campbell. 1999. Nutrient considerations for diversified cropping systems in the Northern Great Plains. Agron. Abs. p.101. Amer. Soc. of Agron., Madison, WI.
Kruger, H.K. G.A. Peterson, and D.G. Westfall. 1999. Below ground dry matter production and nitrogen content of four legumes in dryland agroecosystems. Agron. Abs. p.245. Amer. Soc. of Agron., Madison, WI.
Poss, D.J., G.A. Peterson, and D.G. Westfall. 1999. Austrian winter pea in dryland systems in Northeastern Colorado. Agron. Abs. p.279. Amer. Soc. of Agron., Madison, WI.
Sherrod, L.A.,G.A. Peterson, D.G. Westfall, and L.R. Ahuja. 1999.  Carbon sequestration rates after 12 years under no-till dryland cropping systems rotations.  Agron. Abs. p.280. Amer. Soc. of Agron., Madison, WI.
Shaver, T.M., G.A. Peterson, D.G. Westfall, and L.R. Ahuja. 1999. Surface soil properties after 12 years of dryland no-till management. Agron. Abs. p.280. Amer. Soc. of Agron., Madison, WI.
Berrada, A. and G.A.Peterson. 2000. Development of a sustainable dryland cropping systems in SW Colorado and SE Utah. Agron. Abs. p.132. Amer. Soc. of Agron., Madison, WI.
Gangloff, W., D.G. Westfall, and G.A. Peterson. 2000. Availability of organic and inorganic zinc fertilizers. Agron. Abs. p.277. Amer. Soc. of Agron., Madison, WI..
Gangloff, W., R. Ortega, R.M. Reich, D.G. Westfall, and G.A.Peterson. 2000. Statistical analysis of the management zone concept. Agron. Abs. p.358. Amer. Soc. of Agron., Madison, WI..
McMaster, G.S., L.A. Deer-Ascough, J.C. Ascough, G.A. Peterson, G. Dunn, C. Palic, M. Shaffer,  and M.A. Welz. 2000. Using the GPFARM DDS for evaluating dryland cropping system production and economics in the west central Great Plains. Agron. Abs. p.22. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., D.G. Westfall, L.R. Ahuja, L.A. Sherrod, and D.J. Poss. 2000. Advances in dryland agroecosystems: Results of 15 years of research. Agron. Abs. p.310 Amer. Soc. of Agron., Madison, WI..
Shaver, T.M., G.A. Peterson, D.G. Westfall, L.A, Sherrod, L.R. Ahuja,  and G. Dunn. 2000. No-till cropping system effects on organic carbon content of surface soil aggregates, POM, and mineral fractions. Agron. Abs. p.311.  Amer. Soc. of Agron., Madison, WI.
Sherrod, L.A., G. Dunn, G.A. Peterson,  and R.L. Kolberg. 2000. Total inorganic carbon analysis by modified pressure calcimeter. Agron. Abs. p.365 Amer. Soc. of Agron., Madison, WI..
Sorge, G.M., G.A. Peterson, D.G. Westfall, and J.M. Krall. 2000. Incorporating legumes in semiarid, 
no-till agroecosystems: Soil quality effects. Agron. Abs. p.317 Amer. Soc. of Agron., Madison, WI..
Andales, A.A., Ahuja, L.R., and Peterson, G.A. 2002. A modeling approach to the evaluation of altenative cropping systems. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Indianapolis, IN 10-14 Nov. 2002.  
Andales, A.A., Ahuja, L.R., and Peterson, G.A. 2002. A modeling approach to the evaluation of altenative cropping systems. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Indianapolis, IN 10-14 Nov. 2002.  
Halvorson, A.D., Del Grosso, S.J., Mosier, A.R., Parton, W.J., Peterson, G.A., and Robertson, G.P. 2003. Measurement and modeling of soil atmosphere N2O and CO2 exchange for global warming potential in agroecosystems. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Reeder, S.J., L.A. Sherrod, C.A. Cambardella.  2003.  Direct analysis of POM-C using loss-on-ignition to correct for sand weight.  Agron. Abs. Amer. Soc. Agron. Madison, WI. Denver, CO 2-6 Nov. 2003.
Sherrod, L.A., Peterson, G.A., Westfall, D.G. and Ahuja, L.R. 2003. Soil organic carbon pools after 12       years in a no-till agroecosystem as impacted by PET gradient, topography, and cropping system intensity. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Johnson, C.K., Eskridge K.M., Wienhold, B.J., Doran, J.W., Peterson, G.A., Buchleiter, G.W. and Corwin, D.L. 2003. Designing field scale experiments using apparent soil electrical conductivity. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Andales, A.A., Ahuja, L.R., Green, T.R., Erskine, R.H., and Peterson, G.A. 2003. Spatial and temporal correlations among dryland grain yield and soil water content in a sloping field. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Koch, M.D., Peairs, F.B., and Peterson, G.A. 2003. Integrating pest management with dryland cropping rotations. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Poss, D.J., Peterson, G.A., and Peairs, F.B. 2003. Dryland cropping systems in a low precipitation high evapotranspiration environment. Agron. Abs. Amer. Soc. of Agron., Madison, WI. Denver, CO 2-6 Nov. 2003.
Sherrod, L. A., G. A. Peterson, D. G. Westfall, and L. R. Ahuja.  2003.  Soil organic carbon pools after 12 years in no-till agroecosystems as impacted by PET gradient, topography and cropping systems intensity.  Agron. Abs.  Amer. Soc. of Agron., Madison, WI.
Ma, L., L.A. Sherrod, G.A. Peterson, N. Hansen, L.R. Ahuja, L.R.  2006.  Soil organic carbon pool changes under long-term no-till and cropping intensity regimes across an evapotranspiration gradient in Eastern Colorado, USA.  Inter. Soil Tillage Res. Org. Proc.  Kiel, Germany.  8/28-9/23 2006.  
Peterson, G. A. and Westfall. D.G.  2004.  Landscapes, soil and water conservation, and diversity in Great Plains agroecosystems. Agron Abs. Amer. Soc. of Agron., Madison, WI.
Peterson, G.A., D.G. Westfall, and L.R. Ahuja. 2006. Managing precipitation use in dryland systems to enhance productivity and sustainability. (Invited paper) Abstract [37-2] of the 18th World Congress of Soil Science. Philadelphia, PA.
Westfall, D. G., Carlos Cantero, G. A. Peterson, and L. Sherrod.  2006.  Crop residue levels over a 12-yr period of no-till cropping systems in a semi-arid environment.  Abstract 1555a of  the18th World Congress of Soil Science. Philadelphia, PA.
Lloyd, G., L.A. Sherrod, N.C. Hansen, L. Ahuja and D.G. Westfall. 2009. Biomass Production Potential of Wheat, Corn, and Sorghum in Dryland Cropping Environments. Agron. Abs. Amer. Soc. of Agron., Madison, WI. 
Sherrod, L.A., J.D. Reeder, W. Hunter, and L.R. Ahuja.  2009.  A Rapid and Cost Effective Soil Carbon Mineralization Method for Static Incubations.  Agron. Abs. Amer. Soc. Agron. Madison, WI. Pittsburgh, PA 1-5 Nov. 2009.
Sherrod, L.A., Ahuja, L.R., Hansen, N.C., Westfall, D.G., and Peterson, G.A.  2009.  Impact of Precipitation Timing on Soil Water at Planting on Wheat and Corn Yields in the Central Great Plains.  Agron. Abs. Amer. Soc. Agron. Madison, WI. Pittsburgh, PA 1-5 Nov. 2009.
Sherrod, L.A., L.R. Ahuja, N.C. Hansen, G.A. Peterson, and D.G. Westfall.  2010.  Drought and Cropping Intensity Impact on Soil Organic Carbon and Total N Across a Catena Sequence.  Agron. Abs. Amer. Soc. Agron. Madison, WI. Long Beach, CA.  31 Oct.-4 Nov. 2010.
Lloyd, G. and N. Hansen. 2010. Limitations to residue harvest in semi-arid cropping systems.  Agron. Abs. Amer. Soc. Agron. Madison, WI. Long Beach, CA. 31 Oct – 4 Nov 2010.
Peterson, G.A. and D.G. Westfall. 2012. Charting the Future for Soil Management with an Eye to our History. Agron. Abs. Amer. Soc. Agron. Madison, WI. Cincinnati, OH. 21 -24 Oct 2012.


Non‑technical papers:
Westfall, D. G. and G. A. Peterson.  1990.  Improving your dryland performance.  Solutions 34(5):32-34 and 49.
Wood, C. W., G. A. Peterson and D. G. Westfall.  1990.  Greater crop management intensity increases soil quality.  Better Crops 74(3):20-22.
Westfall, D.G., G.A. Peterson, and J.L. Sanders.  1992.  Phosphorus reduces stress in intensive dryland no-till crop rotations. Better Crops with Plant Food. Vol. 76. Fall 1992. pp. 20-21.
Westfall, D.G., G.A. Peterson, R.L. Kolberg, and L. Sherrod. 1994. Extra crop is payoff in dryland no-till intensified cropping system. Fluid Journal 2:18-20.
Peterson, G.A. 1996. Nitrogen: The vital nutrient in the Great Plains. Fluid Journal Vol.4, No.3, p.18-21.
Peterson, G.A. and D.G. Westfall. 1996. Maximum water conservation after wheat harvest. Cons. Tillage Digest Vol.3. No.5, p.9.
Ortega, R.A., D.G. Westfall, and G.A. Peterson. 1997.  Variability of phosphorus over landscapes and dryland winter wheat yields.  Better Crops: 81(2) 24-27.
Peterson, G.A. and D.G. Westfall. 1998. No-till practices in the Central Great Plains make summer fallow unnecessary.  Conservation Tillage Digest 5:(No. 5)14-16.
Ortega, R.A., D.G. Westfall, G.A. Peterson, and W.J. Gangloff. 1998. Soil variability in landscapes affects nitrogen management. Fluid Journal. Vol. 6: (No. 3) 23-26.
Sherrod, L.A. and G.A. Peterson.  2002. Eliminating Summer Fallow Maximizes Carbon Sequestration in Dryland Cropping Systems.  From The Ground Up Agronomy News, Cooperative Extension, Colorado State University.  Pages 9-10.  May 2002 Vol. 22 Issue 2.
Helm, A., and N. Hansen. 2008. Crop Rotation That Reduce Fallow Frequency in Dryland Crop Rotations. From The Ground Up: Agronomy News 27 (4): 3-5.
Norvell,K. N.C. Hansen, D.G. Westfall, and L.R. Ahuja. 2008. Runoff and Erosion Estimates for Great Plains Dryland Agroecosystems. Proceedings of AGU Hydrology Days 2008: 79-87.
Sherrod, L.A., L.R. Ahuja, N.C. Hansen, K. Larson, D. Thompson, D. Harn, C. Thompson.  2010.  Water Storage and Precipitation Impacts on Wheat and Sorghum Yields Over 22 Years at Stonington (Bill Wright Farm).  TR10-02 January 2009; Plainsman Research Center 2009 Research Reports; Agricultural Experiment Station, Colorado State University, pp 101-105. 
Barbarick, K., N. Hansen, and J. McDaniel. 2010. Biosolids Application to No-Till Dryland Rotations: 2008 Results. TR 10-04. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
Barbarick, K., N. Hansen, and J. McDaniel. 2011. Biosolids Application to No-Till Dryland Rotations: 2009 Results. TR 11-06. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
 Barbarick, K., N. Hansen, and J. McDaniel. 2012. Biosolids Application to No-Till Dryland Rotations: 2010 and 2011 Results. TR 12-06. Agric. Exp. Stn., Colo. State Univ., Fort Collins, CO.
 


 


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