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Agricultural Research Service United States Department of Agriculture
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Ronald Follett
 

Stephen J Del Grosso (Steve)
Soil Plant Nutrient Research (SPNR)
Research Soil Scientist

Phone: (970) 492-7281
Fax: (970) 492-7213
NATURAL RESOURCES RESEARCH CENTER
2150 CENTRE AVENUE, BUILDING D, SUITE 100
FORT COLLINS, CO, 80526-8119

Projects
INTERACTIONS BETWEEN LAND USE, LAND MGMT, AND CLIMATE CHANGE: RELATIONS TO CARBON AND NITROGEN CYCLING, TRACE GASES AND AGROECOSYSTEMS
Appropriated (D)
  Accession Number: 418149
GRACENET: AN ASSESSMENT OF SOIL CARBON SEQUESTRATION AND GREENHOUSE GAS MITIGATION BY AGRICULTURAL MANAGEMENT
Cross Location (L)
  Accession Number: 411610
USDA AGRI AND FORSTRY GRNHSE GAS INVENT. AND EVALUATE THE POTENTIAL OF DIFF. CROPPING SYS., INCLDG BIOFUELS, TO MITIGATE GHG EMISSIONS
Specific Cooperative Agreement (S)
  Accession Number: 417961
NITROGEN SOURCE EFFECTS ON NITROUS OXIDE EMISSIONS FROM IRRIGATED AND RAINFED PRODUCTION SYSTEMS
Trust (T)
  Accession Number: 416500

Publications
Tillage and Nitrogen Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems - (Abstract) - (03-Aug-09)
15n Isotopic Crop Exchange Residue Studies Suggest That Ipcc N Input methodologies to Assess N2o-N Emissions Should Be Reevaluated - (Peer Reviewed Journal)
Delgado, J.A., Del Grosso, S.J., Ogle, S. 2009. 15N Isotopic Crop Exchange Residue Studies Suggest that IPCC N Input Methodologies to Assess N2O-N Emissions Should be Reevaluated. Nutrient Cycling in Agroecosystems. (doi:10.1007/s10705-009-9300-9).
Tillage and Nitrogen Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems - (Peer Reviewed Journal) - (01-Jun-09)
Bias in IPCC Methodologies for Assessment of N2O emissions from Crop Residue - (Abstract)
Delgado, J.A., Del Grosso, S.J., Ogle, S. 2009. Bias in IPCC Methodologies for Assessment of N2O emissions from Crop Residue. Soil Science Society of America Annual Meeting.
Nitrogen, Tillage, and Crop Rotation Effects On Carbon Dioxide and Methane Fluxes from Irrigated Cropping Systems - (Peer Reviewed Journal)
Alluvione, F., Halvorson, A.D., Del Grosso, S.J. 2009. Nitrogen, Tillage, and Crop Rotation Effects On Carbon Dioxide and Methane Fluxes from Irrigated Cropping Systems. Journal of Environmental Quality. 38:2023-2033.
Nitrogen Rate and Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado - (Other)
Halvorson, A.D., Del Grosso, S.J., Alluvione, F. 2009. Nitrogen Rate and Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado. Better Crops with Plant Food. 93 (1):16-18.
Nitrogen Source Affects Nitrous Oxide Emissions from Irrigated No-Till Corn in Colorado (USA) - (Proceedings/Symposium)
Halvorson, A.D., Del Grosso, S.J. 2009. Nitrogen Source Affects Nitrous Oxide Emissions from Irrigated No-Till Corn in Colorado (USA). In: Grignani, C., Acutis, M., Zavatto, L., Bechini, L. Betora, C., Gallina, P.M. and Sacco, D. eds.). Proceedings 16th Nitrogen Workshop, Connecting Different Scales of Nitrogen Use in Agriculture. June 28 to July 1, 2009. Turin, Italy. (abstract). p. 161-162.
Estimating Agricultural Nitrous Oxide Emissions - (Peer Reviewed Journal)
Del Grosso, S.J., Wirth, J., Ogle, S.M., Parton, W.J. 2008. Estimating Agricultural Nitrous Oxide Emissions. Trans American Geophysical Union. 89, 529-530.
A Simple Three Pool Model Accurately Describes Patterns of Long Term, Global Litter Decomposition in the Long Term Intersite Decomposition Experiment Team (LIDET) Date - (Peer Reviewed Journal) - (22-Jul-08)
Nitrogen Source Effects On Nitrous Oxide Emissions From An Irrigated No-Till Corn Field (GRACEnet) - (Abstract) - (25-Jun-08)
Modeling denitrification in a tile-drained, corn and soybean agroecosystem of Illinois, USA - (Peer Reviewed Journal)
David, M.B., Del Grosso, S.J., Hu, X., Mcisaac, G.F., Parton, W.J., Marshall, E.P., Tonitto, C., Youssef, M.A. 2009. Modeling denitrification in a tile-drained, corn and soybean agroecosystem of Illinois, USA. Biogeochemistry 93: 7-30.
Global Scale DAYCENT Model Analysis of Greenhouse Gas Mitigation Strategies for Cropped Soils. - (Peer Reviewed Journal) - (04-Jun-08)
Management Effects On Nitrous Oxide Emissions From Irrigated Cropping Systems - (Abstract)
Halvorson, A.D., Del Grosso, S.J., Reule, C.A. 2008. Management Effects On Nitrous Oxide Emissions From Irrigated Cropping Systems. Soil and Water Conservation Society meeting. July 26-30, 2008. On-line Conference abstract. Book, p. 52.
U.S. Agriculture and Forestry Greenhouse Gas Inventory: 1990-2005 - (Abstract)
Del Grosso, S.J., Ogle, S., Wirth, J., Skiles, S. 2008. U.S. Agriculture and Forestry Greenhouse Gas Inventory: 1990-2005. United States Department of Agriculture Technical Bulletin 1921.
Chapter 2: Livestock and grazed land emissions. U.S. Agriculture and Forestry Greenhouse Gas Inventory: 1990-2005. Technical bulletin 1921 - (Abstract)
Del Grosso, S.J., Ogle, S., Wirth, S., Skiles, S. 2008. Chapter 2: Livestock and grazed land emissions. U.S. Agriculture and Forestry Greenhouse Gas Inventory: 1990-2005. Technical bulletin 1921. United States Department of Agriculture Technical Bulletin 1921. 11-32.
Soil Nitrous Oxide Emissions with Crop Production for Biofuel: Implications for Greenhouse Gas Mitigation - (Proceedings/Symposium)
Ogle, S.M., Del Grosso, S.J. , Adler, P.R. , Parton, W.J. . 2008. Soil nitrous oxide emissions with crop production for biofuel: Implications for greenhouse gas mitigation. In: J.L. Outlaw and D.P. Ernstes (Eds.). The Lifecycle Carbon Footprint of Biofuels, Farm Foundation, Oak Brook, IL. p. 11-18.
Impacts of Cropping Intensity on Soil C and Net Greenhouse Gas Fluxes for Dryland Cropping in Northeastern Colorado - (Proceedings/Symposium)
Del Grosso, S.J., Sherrod, L.A., Mosier, A., Peterson, G.A., Ahuja, L.R., Hansen, N. 2008. Impacts of Cropping Intensity on Soil C and Net Greenhouse Gas Fluxes for Dryland Cropping in Northeastern Colorado. Proceedings Great Plains Soil Fertility Conference. Vol. 12, pp. 40-44.
Greenhouse gas mitigation potential with cellulosic and grain bioenergy crops - (Abstract)
Adler, P.R., Dell, C.J., Veith, T.L., Del Grosso, S.J., Parton, W.J. 2008. Greenhouse gas mitigation potential with cellulosic and grain bioenergy crops. Ecological Society of America Abstracts. p. 40
Nitrogen Fertilization Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems - (Proceedings/Symposium)
Halvorson, A.D., Del Grosso, S.J., Reule, C.A. Nitrogen fertilization effects on nitrous oxide emissions from irrigated cropping systems. Proc. of 2008 Great Plains Soil Fertility Conference. Denver, CO March 4-5, 2008. Kansas State University, Manhattan and Potash and Phosphate Institute, Brookings, SD. 12:28-22.
Adding ecosystem function to agent-based land use models - (Peer Reviewed Journal)
Yadav, V., Del Grosso, S.J., Parton, W.J., Malanson, G.P. 2008. Adding ecosystem function to agent-based land use models. Journal of Land Use Science. 3, 27-40.
Global Net Primary Production Predicted from Vegetation Class, Precipitation, and Temperature. - (Peer Reviewed Journal)
Del Grosso, S.J., Parton, W.J., Stohlgren, T., Zheng, D., Bachelet, D., Prince, S., Hibbard, K., Olson, R. 2008. Global Net Primary Production Predicted from Vegetation Class, Precipitation, and Temperature. Ecology.
Global Potential Net Prmary Production Predicted from Vegetation Class, Precipitation, and Temperature - (Peer Reviewed Journal)
Del Grosso, S.J., Parton, W., Stohgren, T., Zheng, D., Bachelet, D., Prince, S., Hibbard, K., Olson, R. 2008. Global Potential Net Prmary Production Predicted from Vegetation Class, Precipitation, and Temperature. Ecology. 89: 2117-2126.
Testing DAYCENT Model Simulations of Corn Yields and Nitrous Oxide Emissions in Irrigated Tillage Systems in Colorado - (Peer Reviewed Journal)
Del Grosso, S.J., Halvorson, A.D., Parton, W.J. 2008. Testing DAYCENT Model Simulations of Corn Yields and Nitrous Oxide Emissions in Irrigated Tillage Systems in Colorado. Journal of Environmental Quality 37:1383-1389.
Nitrogen, Tillage, and Crop Rotation Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems - (Peer Reviewed Journal)
Halvorson, A.D., Del Grosso, S.J., Reule, C.A. 2008. Nitrogen, Tillage, and Crop Rotation Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems. Journal of Environmental Quality 37:1337-1344.
Daycent Simulated Effects of Land Use and Climate on County Level N Loss Vectors in the Usa - (Book/Chapter)
Del Grosso, S.J., Parton, W.J., Ojima, D.S., Keough, C., Riley, T.H., Mosier, A.R. 2008. Daycent simulated effects of land use and climate on county level n loss vectors in the USA. Follett, R.F. and Hatfield, J.L. (eds). Nitrogen in the Environment: Sources, Problems, and Management 2nd Edition, p. 571-595. Elsevier Science Publishers, The Netherlands.
An index approach to assess nitrogen losses to the environment - (Peer Reviewed Journal)
Delgado, J.A., Shaffer, M.J., Hu, C., Lavado, R., Wong, J.C., Joosse, P., Li, X., Rimski-Korasako, H., Follett, R.F., Del Grosso, S.J., Colon, W., Sotomayor, D. 2008. An index approach to assess nitrogen losses to the environment. Journal of Ecological Engineering 32: 108-120.
Modeling nitrous oxide emissions from bioenergy cropping systems using DAYCENT - (Abstract)
Adler, P.R., Dell, C.J., Veith, T.L., Del Grosso, S.J., Parton, W.J. 2007. Modeling nitrous oxide emissions from bioenergy cropping systems using DAYCENT [abstract]. CrossOver 2007 - Bioenergy: From Fields to Wheels. p. 58.
Impacts of prior land use and increased corn acreage on life cycle assessment of net greenhouse gas flux - (Abstract)
Adler, P.R., Ogle, S., Parton, W.J., Del Grosso, S.J., Paustian, K. 2007. Impacts of prior land use and increased corn acreage on life cycle assessment of net greenhouse gas flux [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. p. 92.
Mitigation of greenhouse gas emissions with cellulosic and grain bioenergy crops - (Abstract)
Adler, P.R., Dell, C.J., Del Grosso, S.J., Parton, W.J. 2007. Mitigation of greenhouse gas emissions with cellulosic and grain bioenergy crops [abstract]. Ecological Society of America Abstracts. p. 113-114.
Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado - (Abstract)
Halvorson, A.D., Del Grosso, S.J., Reule, C.A. 2007. Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado. ASA-CSSA-SSSA Annual Meeting Abstracts. CD-ROM.
Projected Ecosystem Impact of the Prairie Heating and CO2 Enrichment Experiment - (Peer Reviewed Journal)
Parton, W.J., Morgan, J.A., Wang, G., Del Grosso, S.J. 2007. Projected Ecosystem Impact of the Prairie Heating and CO2 Enrichment Experiment. New Phytologist 174:823-834.
Cellulosic and Grain Bioenergy Crops Reduce Net Greenhouse Gas Emissions Associated with Transportation Fuels - (Abstract)
Adler, P.R., Del Grosso, S.J., Parton, W.J. 2007. Cellulosic and Grain Bioenergy Crops Reduce Net Greenhouse Gas Emissions Associated with Transportation Fuels[abstract]. USDA Symposium on Greenhouse Gases & Carbon Sequestration in Agriculture and Forestry. p.32
Nitrogen, Tillage, and Crop Rotation Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems. - (Abstract)
Halvorson, A.D., Del Grosso, S.J. 2007. Nitrogen, Tillage, and Crop Rotation Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems. USDA Greenhouse Gas Symposium. In Abstracts of 4th USDA Symposium on Greenhouse Gases and Carbon Sequestration in Agriculture and Forestry. Feb. 6-8, 2007, Baltimore, MD.
Gracenet (Greenhouse Gas Reduction Through Agricultural Carbon Enhancement Network): An Assessment of Soil Carbon Sequestration and Greenhouse Gas Mitigation by Agricultural Management - (Abstract)
Stott, D.E., Cavigelli, M.A., Dell, C.J., Del Grosso, S.J., Follett, R.F., Franzluebbers, A.J., Johnson, J.M., Liebig, M.A., Parkin, T.B., Smith, J.L. 2007. GRACEnet (Greenhouse Gas Reduction through Agricultural Carbon Enhancement network): an assessment of soil carbon sequestration and greenhouse gas mitigation by agricultural management. 4th USDA Greenhouse Gas Symposium, February 5-8, 2007, Baltimore, Maryland. 2007 CDROM.
Comparison of simulated and observed N2O gas emission rates from bioenergy cropping systems - (Abstract)
Adler, P.R., Dell, C.J., Del Grosso, S.J., Parton, W.J. 2006. Comparison of simulated and observed N2O gas emission rates from bioenergy cropping systems. Agronomy Abstracts. Paper No. 413.
Daycent Model Analysis of Net Greenhouse Gas Fluxes for Farm Fields in Eastern Virginia. - (Proceedings/Symposium)
Del Grosso, S.J., Follett, R.F., Wallace, J. 2006. Daycent model analysis of net greenhouse gas fluxes for farm fields in eastern virginia. American Society of Agronomy Abstracts on CD ROM.
Effect of Crop Rotation, Tillage, and Soil Series on Soil Organic Carbon Sequestration. - (Other)
Follett, R.F., Del Grosso, S.J., Wallace, J. 2006. Effect of Crop Rotation, Tillage, and Soil Series on Soil Organic Carbon Sequestration. American Society of Agronomy Abstracts on CD ROM.
Land Use Change Effects from Cellulosic and Grain Ethanol Production under Climate Change - (Proceedings/Symposium)
Adler, P.R., Del Grosso, S.J., Parton, W.J., Easterling, W.E. 2006. Land Use Change Effects from Cellulosic and Grain Ethanol Production under Climate Change. In: Sanderson, M.A, Adler, P., Goslee, S., Ritchie, J., Skinner, H., Soder, K., editors. Proceedings of the Fifth Eastern Native Grass Symposium, October 10-13, 2006, Harrisburg, Pennsylvania. p. 1.
Mitigation potential and costs for global agricultural greenhouse gas emissions - (Peer Reviewed Journal)
Beach, R., Deanggelo, B., Rose, S., Li, C., Salas, W., Del Grosso, S.J. 2008. Mitigation potential and costs for global agricultural greenhouse gas emissions. American Journal of Agricultural Economics 38: 109-115..
Modeling Denitrification in Terrestrial and Aquatic Ecosystems at Regional Scalles. Ecological Applications. - (Peer Reviewed Journal)
Boyer, E.W., Alexander, R.B., Parton, W.J., Butterbach-Bahl, K., Donner, S.D., Skaggs, R.W., Del Grosso, S.J. 2006. Modeling Denitrification in Terrestrial and Aquatic Ecosystems at Regional Scalles. Ecological Applications 16, 2123-2142.
Agricultural Exhaust: a Reason to Invest in Soil - (Peer Reviewed Journal)
Franzluebbers, A.J., Follett, R.F., Johnson, J.M., Liebig, M.A., Gregorich, E.G., Parkin, T.B., Smith, J.L., Del Grosso, S.J., Jawson, M.D., Martens, D.A. 2006. Agricultural exhaust: a reason to invest in soil. Journal of Soil and Water Conservation. 61(3):98A-101A.
Daycent Model Analysis of Net Greenhouse Gas Fluxes for Farm Fields in Eastern Virginia - (Abstract)
Del Grosso, S.J., Follett, R.F., Wallace, J. 2006. Daycent model analysis of net greenhouse gas fluxes for farm fields in eastern virginia. American Society of Agronomy Abstracts.
Effect of Crop Rotation, Tillage, and Soil Series on Soil Organic Carbon Sequestration - (Abstract)
Follett, R.F., Del Grosso, S.J., Wallace, J., Kimble, J. 2006. Effect of crop rotation, tillage, and soil series on soil organic carbon sequestration. American Society of Agronomy Abstracts.
Using Ecosystem Models to Inventory and Mitigate Environemntal Impacts of Agriculture 2006. Proceedings of Workshop on Agriculture Air Quality: State of the Science - (Proceedings/Symposium)
Del Grosso, S.J., Parton, W.J., Ojima, D.S., Mosier, A.R. 2006. Using Ecosystem Models to Inventory and Mitigate Environemntal Impacts of Agriculture 2006. Proceedings of Workshop on Agriculture Air Quality: State of the Science. Proceedings of the Workshop on Agricultural Air Quality: State of the Science. In V.P. Anaeja, W.H. Schlesinger, R. Knighton, G. Jennings, D. Niyogi, W. Gilliam, C.S. Duke (eds.) Proceedings Workshop on Agricultural Air Quality: State of the Science, p. 571-574. North Carolina State University, Department of Communication Services, Raleigh, NC, June 5-8, 2006.
Global Scale Daycent Model Analysis of Greenhouse Gas Mitigation Strategies for Cropped Soils - (Other)
Del Grosso, S.J., Parton, W.J., Ojima, D.S., Deandelo, B.J., Rose, S. 2006. Global scale daycent model analysis of greenhouse gas mitigation strategies for cropped soils. American Geophysical Union. (Oral presentation at the annual meeting).
Daycent National Scale Simulations of N2o Emissions from Cropped Soils in the Usa - (Peer Reviewed Journal)
Del Grosso, S.J., Parton, W., Mosier, A.R., Walsh, M.K., Ojima, D., Thornton, P.E. 2006. DAYCENT national scale simulations of N2O emissions from cropped soils in the usa. Journal of Environmental Quality. 35:1451-1460.
Daycent National Scale Simulations of N2o Emissions from Cropped Soils in the Usa - (Peer Reviewed Journal)
Del Grosso, S.J., Parton, W.J., Mosier, A.R., Walsh, M.K., Ojima, D., Thornton, P.E. 2006. Daycent national scale simulations of N2O emissions from cropped soils in the usa. Journal of Environmental Quality. 35:1451-1460.
Using Ecosystem Models to Inventory and Mitigate Environmental Impacts of Agriculture - (Proceedings/Symposium)
Del Grosso, S.J., Ogle, S., Follett, R.F., Parton, W.J., Paustian, K. 2005. Using ecosystem models to inventory and mitigate environmental impacts of agriculture. Global Climate Change Conference Proceedings. (Poster presentation during meeting.)
Determining the Long-Term Impact of Bioenergy Crops on the Global Warming Potential of Energy Use - (Abstract)
Adler, P.R., Del Grosso, S.J., Parton, W.J., Easterling, W.E. 2005. Determining the long-term impact of bioenergy crops on the global warming potential of energy use [abstract]. U.S. Climate Change Science Program Workshop: Climate Science in Support of Decision Making. p. 62.
Impact of Climate Change on Full Carbon Cycle Analysis of Bioenergy Cropping Systems in Pennsylvania - (Abstract)
Adler, P.R., Del Grosso, S.J., Parton, W.J., Easterling, W.E. 2005. Impact of climate change on full carbon cycle analysis of bioenergy cropping systems in pennsylvania. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No. 1410.
Climate Change Effects on Greenhouse Gas Emissions from Bioenergy Cropping Systems in Pennsylvania - (Abstract)
Adler, P.R., Del Grosso, S.J., Parton, W.J., Easterling, W.E. 2005. Climate change effects on greenhouse gas emissions from bioenergy cropping systems in pennsylvania. Ecological Society of America Abstracts. p. 1.
Global Mitigation of Non-Co2 Greenhouse Gases - (Other)
Gallaher, M., Ottinger, D., Godwin, D., Deangelo, B., Beach, R., Harnisch, J., Wartmann, S., Salas, W., Li, C., Del Grosso, S.J., Sulser, T. 2005. Global mitigation of non-co2 greenhouse gases. EPA-ARS Technical Report.
Greenhouse Gas Contributions and Mitigation Potential in Agricultural Regions of North America - (Abstract)
Franzluebbers, A.J., Follett, R.F., Gregorich, E.G., Johnson, J.M., Liebig, M.A., Martens, D.A., Del Grosso, S.J., Jawson, M.D. 2005. Greenhouse gas contributions and mitigation potential in agricultural regions of North America [abstract]. Third USDA Symposium on Greenhouse Gases & Carbon Sequestration in Agriculture and Forestry. 21-24 March 2005, Baltimore, Maryland. Available: http://soilcarboncenter.k-state.edu/conference.
Climate Change Effects on Greenhouse Gas Emissions from Bioenergy Cropping Systems in Pennsylvania - (Abstract)
Adler, P.R., Del Grosso, S.J., Parton, W.J., Easterling, W.E. 2005. Climate change effects on greenhouse gas emissions from bioenergy cropping systems in pennsylvania. Greenhouse Gas Emissions and Carbon Sequestration Symposium. p. 1.
Modeling Greenhouse Gas Emissions from Bioenergy Cropping Systems in Pennsylvania Using Daycent - (Proceedings/Symposium)
Adler, P.R., Del Grosso, S.J., Parton, W.J. 2005. Modeling greenhouse gas Emissions from bioenergy cropping systems in Pennsylvania using DAYCENT. Eastern Native Grass Symposium. Proc. p. 40-52.
Drought and Grazing Interaction and Recovery in Shorgrass Steppe: a Daycent Modeling Analysis - (Abstract)
Grant, D.W., Del Grosso, S.J., Parton, W.J., Reeder, S.J., Morgan, J.A. 2005. Drought and grazing interaction and recovery in shorgrass steppe: a DAYCENT modeling analysis. Shortgrass Steppe Symposium. Reeder Abstract.
Simulated Carbon Sink Response of Shortgrass Steppe, Tallgrass Prairie and Forest Ecosystems to Rising [co2], Temperature and Nitrogen Input - (Peer Reviewed Journal)
Pepper, D.A., Del Grosso, S.J., Mcmurtie, R.E., Parton, W. 2005. Simulated carbon sink response of shortgrass steppe, tallgrass prairie and forest ecosystems to rising [co2], temperature and nitrogen input. Global Biogeochemical Cycles. 19:GB1004, doi:10.1029/2004gb002226.
Nitrogen Pools and Fluxes in Grassland Soils Sequestering Carbon - (Peer Reviewed Journal)
Conant, R., Paustian, K., Del Grosso, S.J., Parton, W. 2005. Nitrogen pools and fluxes in grassland soils sequestering carbon. Nutrient Cycling in Agroecosystems. 71:239-248.
Nitrogen Emissions Along the Colorado Front Range: Response to Population Growth, Land and Water Use Change, and Agriculture - (Book/Chapter)
Baron, J.S., Del Grosso, S.J., Ojima, D.S., Theobald, D.M., Parton, W.J. 2004. Nitrogen emissions along the colorado front range: response to population growth, land and water use change, and agriculture. American Geophysical Union.

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