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United States Department of Agriculture

Agricultural Research Service

Kurt A. Spokas

Soil Scientist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Physical and chemical characterization of waste wood derived biochars - (Peer Reviewed Journal) - (28-Oct-14)
Assessing microbial contributions to N2O impacts following biochar additions - (Peer Reviewed Journal) - (21-Oct-14)
Crop yield responses to a hardwood biochar across varied soils and climate conditions - (Abstract Only) - (10-Sep-14)
Phosphorus reclamation through hydrothermal carbonization of animal manures Reprint Icon - (Peer Reviewed Journal)
Heilmann, S.M., Molde, J.S., Timler, J.G., Wood, B.M., Mikula, A., Vozhdayev, G.V., Spokas, K.A., Colosky, E., Valentas, K.J. 2014. Phosphorus reclamation through hydrothermal carbonization of animal manures. Journal of Environmental Science and Technology. 48(17):10323-10329.
Biochar alters manure's effect on nitrogen cycling and greenhouse gas emissions in a calcareous soil - (Abstract Only)
Lentz, R.D., Ippolito, J.A., Spokas, K.A. 2014. Biochar alters manure's effect on nitrogen cycling and greenhouse gas emissions in a calcareous soil. ASA-CSSA-SSSA Annual Meeting Abstracts. Long Beach, CA, Nov 2-5, 2014..
Physical disintegration of biochar: An overlooked process Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Novak, J.M., Masiello, C.A., Johnson, M., Colosky, E., Ippolito, J.A., Trigo, C. 2014. Physical disintegration of biochar: An overlooked process. Journal of Environmental Science and Technology. 1(8):326-332.
Biochar and manure effects on net nitrogen mineralization and greenhouse gas emissions from calcareous soil under corn - (Peer Reviewed Journal)
Lentz, R.D., Ippolito, J.A., Spokas, K.A. 2014. Biochar and manure effects on net nitrogen mineralization and greenhouse gas emissions from calcareous soil under corn. Soil Science Society of America Journal. 78:1641-1655.
Biochar aging reduces earthworm avoidance - (Abstract Only)
Weyers, S.L., Spokas, K.A., Gaskin, J., Collins, H.P., Cantrell, K.B. 2014. Biochar aging reduces earthworm avoidance [abstract]. The 10th International Symposium on Earthworm Ecology. p. 120.
Phenolic acid sorption to biochars from mixtures of feedstock materials Reprint Icon - (Peer Reviewed Journal)
Hall, K.E., Calderon, M.J., Spokas, K.A., Cox, L., Koskinen, W.C., Novak, J.M., Cantrell, K.B. 2014. Phenolic acid sorption to biochars from mixtures of feedstock materials. Water, Air, and Soil Pollution. 225:1-9.
Biochar effects on soil hydrology - (Book / Chapter) - (11-Jun-14)
Biochar effects on crop yield - (Book / Chapter) - (01-Jun-14)
Crop residue decomposition in Minnesota biochar-amended plots - (Peer Reviewed Journal)
Weyers, S.L., Spokas, K.A. 2014. Crop residue decomposition in Minnesota biochar-amended plots. Solid Earth. 5:499-507.
Characteristics and applications of biochar for environmental remediation: A review Reprint Icon - (Peer Reviewed Journal)
Xie, T., Reddy, K.R., Wang, C., Yargicoglu, E., Spokas, K.A. 2014. Characteristics and applications of biochar for environmental remediation: A review. Critical Reviews in Environmental Science Technology. DOI: 10.1080/10643389.2014.924180.
Assessing biochar's ability to reduce bioavailability of aminocyclopyrachlor in soils Reprint Icon - (Peer Reviewed Journal)
Rittenhouse, J.L., Rice, P.J., Spokas, K.A., Koskinen, W.C. 2014. Assessing biochar's ability to reduce bioavailability of aminocyclopyrachlor in soils. Environmental Pollution. 189:92-97.
Effects of biochars and hyrdochars produced from lignocellulosic and animal manure on fertility of a Mollisol and Entisol - (Peer Reviewed Journal)
Novak, J.M., Spokas, K.A., Cantrell, K.B., Ro, K.S., Watts, D.W., Glaz, B.S., Hunt, P.G., Busscher, W.J. 2014. Effects of biochars and hyrdochars produced from lignocellulosic and animal manure on fertility of a Mollisol and Entisol. Soil Use and Management. 30:175-181. DOI:10.1111/sum.12113.
Genetic variation for life history sensitivity to seasonal warming in Arabidopsis thaliana Reprint Icon - (Peer Reviewed Journal)
Li, Y., Cheng, R., Spokas, K.A., Palmer, A., Borevitz, J. 2013. Genetic variation for life history sensitivity to seasonal warming in Arabidopsis thaliana. Genetics. 196:569-577.
Structural equation modeling facilitates transdisciplinary research on agriculture and climate change - (Peer Reviewed Journal)
Smith, R.G., Davis, A.S., Koide, R., Mortensen, D., Grandy, S., Hunter, M., Daly, A., Atwood, L., Jordan, N., Spokas, K.A., Yannarell, A. 2014. Structural equation modeling facilitates transdisciplinary research on agriculture and climate change. Crop Science. 54:475-483.
Influence of biochar amendments on the sorption-desorption of aminocyclopyrachlor, bentazone and pyraclostrobin pesticides to an agricultural soil Reprint Icon - (Peer Reviewed Journal)
Cabrera, A., Cox, L., Spokas, K.A., Hermosin, M.C., Cornejo, J., Koskinen, W.C. 2013. Influence of biochar amendments on the sorption-desorption of aminocyclopyrachlor, bentazone and pyraclostrobin pesticides to an agricultural soil. Science of the Total Environment. 470-471:438-443.
Greenhouse gas production in mixtures of soil with composted and noncomposted biochars is governed by char-associated organic compounds Reprint Icon - (Peer Reviewed Journal)
Borchard, N., Spokas, K.A., Prost, K., Siemens, J. 2014. Greenhouse gas production in mixtures of soil with composted and noncomposted biochars is governed by char-associated organic compounds. European Journal of Soil Science. 43(3):971-979.
Assessing designer biochar characteristics to ameliorate specific soil limitations - (Abstract Only)
Novak, J.M., Spokas, K.A., Ro, K.S., Johnson, M.G. 2013. Assessing designer biochar characteristics to ameliorate specific soil limitations [abstract]. North American Biochar Symposium. http://symposium2013.pvbiochar.org.
Biochar: The field experience - (Book / Chapter) - (10-Mar-13)
Know your community - Biochar: agronomic and environmental uses community - (Popular Publication)
Spokas, K.A., Novak, J.M. 2013. Know your community - Biochar: agronomic and environmental uses community. CSA News. 58:25.
Determination of polycyclic aromatic hydrocarbons in biochar and biochar amended soil Reprint Icon - (Peer Reviewed Journal)
Fabbri, D., Rombola, A.G., Torri, C., Spokas, K.A. 2013. Determination of polycyclic aromatic hydrocarbons in biochar and biochar amended soil. Journal of Analytical & Applied Pyrolysis. 103(2013):60-67.
Indaziflam adsorption in soils amended with olive cake and olive cake biochar: Effect of dose and temperature - (Abstract Only)
Cabrera, A., Gamiz, B., Cox, L., Celis, R., Spokas, K.A., Koskinen, W.C., Cornejo, J. 2012. Indaziflam adsorption in soils amended with olive cake and olive cake biochar: Effect of dose and temperature [abstract]. Proceedings of The V Iberian Congress of Soil Science Conference, September 6-10, 2012, Angra do Heroism (Terceira Island), Azores. #37.
Impact of biochar field aging on laboratory greenhouse gas production potentials Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A. 2012. Impact of biochar field aging on laboratory greenhouse gas production potentials. Global Change Biology Bioenergy. 5:165-176.
Improved methodology to assess modification and completion of landfill gas management in the aftercare period Reprint Icon - (Peer Reviewed Journal)
Morris, J., Crest, M., Barlaz, M., Spokas, K.A., Akerman, A., Yuan, L. 2012. Improved methodology to assess modification and completion of landfill gas management in the aftercare period. Waste Management. 32(2012):2364-2373.
Challenges and opportunities for mitigating nitrous oxide emissions from fertilized cropping systems Reprint Icon - (Peer Reviewed Journal)
Venterea, R.T., Halvorson, A.D., Kitchen, N.R., Liebig, M.A., Cavigelli, M.A., Del Grosso, S.J., Motavalli, P.P., Nelson, K.A., Spokas, K.A., Singh, B.P., Stewart, C.E., Ranaivoson, A., Strock, J., Collins, H.P. 2012. Challenges and opportunities for mitigating nitrous oxide emissions from fertilized cropping systems. Frontiers in Ecology and the Environment. 10(10)562-570.
Aminocyclopyrachlor sorption in biochar and activated charcoal amended soils - (Abstract Only) - (20-Jun-12)
Evaluation of sorbed polycyclic aromatic hydrocarbons (PAH) on various biochars - (Abstract Only) - (01-Jun-12)
Composting of biochars improves their sorption properties, retains nutrients during composting and affects greenhouse gas emissions after soil application - (Abstract Only) - (01-Jun-12)
Inter-laboratory validation of standardized method to determine permeability of plastic films - (Abstract Only)
Papiernik, S.K., Yates, S.R., Qian, Y., Ajwa, H., Gao, S., Qin, R., Sances, F., Spokas, K.A. 2012. Inter-laboratory validation of standardized method to determine permeability of plastic films. 244th American Chemical Society National Meeting, August 19-23, 2012, Philadelphia PA. AGRO 80, vol. 82, p. 101.
Precision zonal management systems for resilient cereal yields and ecosystem services under variable climates - (Abstract Only) - (17-May-12)
Effect of carbonaceous soil amendments on potential mobility of weak acid herbicides in soil - (Abstract Only)
Koskinen, W.C., Cabrera, A., Spokas, K.A., Cox, L., Rittenhouse, J.L., Rice, P.J. 2012. Effect of carbonaceous soil amendments on potential mobility of weak acid herbicides in soil. In: Xu, J., Wu, J., He, Y. (Eds.). Functions of Natural Organic Matter in Changing Environment. Zhejiang University Press: Hangzhou, China. International Humic Substances Society Conference. p. 281-283.
Adding value to ethanol production byproducts through microwave assisted pyrolysis - (Abstract Only)
Spokas, K.A., Ruan, R., Morrison, R. 2012. Adding value to ethanol production byproducts through microwave assisted pyrolysis [abstract]. 2012 CUTC Program Book. New Processing Technology Session. p. 24. doi: http://corntechconf.org/CUTC/2012-CUTC-program-book.pdf.
Evaluation of Sorbed Polycyclic Aromatic Hydrocarbons (PAH) on Various Biochars - (Abstract Only)
Spokas, K.A. 2012. Evaluation of Sorbed Polycyclic Aromatic Hydrocarbons (PAH) on Various Biochars [abstract]. 2012 US Biochar Conference, July 29-Aug. 2, 2012, Sonoma, CA. Available at: http://2012.biochar.us.com/359/evaluation-sorbed-pah-compounds-biochar.
Applied manure research—looking forward to the benign roles of animal manure in agriculture and the environment - (Book / Chapter)
He, Z., Mingxin, G., Lovanh, N., Spokas, K.A. 2012. Applied manure research—looking forward to the benign roles of animal manure in agriculture and the environment. In: He, Z., editor. Applied Research of Animal Manure: Challenges and Opportunities beyond the Adverse Environmental Concerns. New York, NY:Nova Science. p. 299-309.
Comparative sorption and leaching study of the herbicides fluometuron and MCPA in a soil amended with biochar and other sorbents Reprint Icon - (Peer Reviewed Journal)
Cabrera, A., Cox, L., Spokas, K.A., Hermosin, C., Cornejo, J., Koskinen, W.C. 2011. Comparative sorption and leaching study of the herbicides fluometuron and MCPA in a soil amended with biochar and other sorbents. Journal of Agricultural and Food Chemistry. 59(23):12550-12560.
Impact of field exposure on greenhouse gas production potentials from biochar additions - (Abstract Only)
Spokas, K.A. 2011. Impact of field exposure on greenhouse gas production potentials from biochar additions. ASA-CSSA-SSSA Annual Meeting Abstracts. Abstract #205-7.
Impacts of biochar (black carbon) additions on the sorption and efficacy of herbicides - (Book / Chapter)
Cabrera Mesa, A., Spokas, K.A. 2011. Impacts of biochar (black carbon) additions on the sorption and efficacy of herbicides. In: Kortekamp, A., editor. Herbicides and Environment. Rijeka, Croatia. InTech. p. 315-340.
Analytical pyrolysis of synthetic chars derived from biomass with potential agronomic application (biochar). Relationships with impacts on microbial carbon dioxide production Reprint Icon - (Peer Reviewed Journal)
Fabbri, D., Torri, C., Spokas, K.A. 2012. Analytical pyrolysis of synthetic chars derived from biomass with potential agronomic application (biochar). Relationships with impacts on microbial carbon dioxide production. Journal of Analytical & Applied Pyrolysis. 93(1):77-84.
Can using polymer-coated seed reduce the risk of poor soybean emergence in no-tillage soil? - (Peer Reviewed Journal)
Gesch, R.W., Archer, D.W., Spokas, K.A. 2012. Can using polymer-coated seed reduce the risk of poor soybean emergence in no-tillage soil? Field Crops Research. 125:109-116.
A process-based inventory model for landfill CH4 emissions inclusive of seasonal soil microclimate and CH4 oxidation Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Bogner, J., Chanton, J. 2011. A process-based inventory model for landfill CH4 emissions inclusive of seasonal soil microclimate and CH4 oxidation. Journal of Geophysical Research-Biogeosciences. Available: http://www.agu.org/pubs/crossref/2011/2011JG001741.shtml.
Impact of biochar on earthworm populations: A review - (Peer Reviewed Journal)
Weyers, S.L., Spokas, K.A. 2011. Impact of biochar on earthworm populations: A review. Applied and Environmental Soil Science. DOI: 10.1155/2011/541592.
Biochar: A synthesis of its agronomic impact beyond carbon sequestration Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Cantrell, K.B., Novak, J.M., Archer, D.W., Ippolito, J.A., Collins, H.P., Boateng, A.A., Lima, I.M., Lamb, M.C., Mcaloon, A.J., Lentz, R.D., Nichols, K.A. 2012. Biochar: A synthesis of its agronomic impact beyond carbon sequestration. Journal of Environmental Quality. 41(4):973-989.
Biochar’s role as an alternative N-fertilizer:Ammonia capture Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Novak, J.M., Venterea, R.T. 2012. Biochar’s role as an alternative N-fertilizer:Ammonia capture. Plant and Soil. 350(1):35-42.
Qualitative analysis of volatile organic compounds on biochar Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Novak, J.M., Stewart, C.E., Cantrell, K.B., Uchimiya, S.M., Dusaire, M.G., Ro, K.S. 2011. Qualitative analysis of volatile organic compounds on biochar. Chemosphere. 85(5):869-882.
Structural investigation of bio-char by analytical pyrolysis (Py-GC-MS). Relationships with environmental stability and the occurrence of polyaromatic hydrocarbons (PAHs) - (Abstract Only)
Torri, C., Rombola, A., Conti, R., Fabbri, D., Spokas, K.A. 2011. Structural investigation of bio-char by analytical pyrolysis (Py-GC-MS). Relationships with environmental stability and the occurrence of polyaromatic hydrocarbons (PAHs)[abstract]. UK Biochar Conference 2011. http://www.sccs.org.uk/biochar/Edinburgh-May-2011. On-line.
Biochar Usage: Pros and Cons - (Proceedings)
Ippolito, J.A., Lentz, R.D., Novak, J.M., Spokas, K.A., Collins, H.P., Streubel, J. 2011. Biochar Usage: Pros and Cons. Western Nutrient Management Conference Proceedings. 9:93-98.
Impacts of biochar additions on soil microbial processes and nitrogen cycling - (Abstract Only)
Spokas, K.A. 2011. Impacts of biochar additions on soil microbial processes and nitrogen cycling. Humic Science and Technology Conference. Presentation 1.
Seasonal greenhouse gas emissions (methane, carbon dioxide, nitrous oxide) from engineered landfills: Daily, intermediate, and final California cover soils Reprint Icon - (Peer Reviewed Journal)
Bogner, Spokas, K.A., Chanton, J. 2011. Seasonal greenhouse gas emissions (methane, carbon dioxide, nitrous oxide) from engineered landfills: Daily, intermediate, and final California cover soils. Journal of Environmental Quality. 40(3):1010-1020.
Review of the stability of biochar in soils: predictability of O:C molar ratios Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A. 2010. Review of the stability of biochar in soils: predictability of O:C molar ratios. Carbon Management. 1(2):289-303.
Observations on the methane oxidation capacity of landfill soils - (Peer Reviewed Journal)
Chanton, J., Abichou, T., Langford, C., Spokas, K.A., Hater, G., Goldsmith, D., Barlaz, M. 2011. Observations on the methane oxidation capacity of landfill soils. Waste Management. 31(5):914-925.
Stable Isotopes in Evaluation of Greenhouse Gas Emissions - (Book / Chapter)
Spokas, K.A. 2011. Stable Isotopes in Evaluation of Greenhouse Gas Emissions. In: Encyclopedia of Agrophysics. J. Glinski, J. Horabik, and J. Lipiec (Eds). Springer. Heidelberg, Germany. pp. 845-849.
Production of Ethylene Following Soil Biochar Additions - (Abstract Only)
Spokas, K.A. 2010. Production of Ethylene Following Soil Biochar Additions [abstract]. 2010 U.S. Biochar Initiative Conference. http://www.biorenew.iastate.edu/events/biochar2010/conference-agenda/agenda-overview/breakout-session-4/agriculture-forestry-soil-science-and-environment.html. On-line.
Ethylene: Potential Key for Biochar Amendment Impacts Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Baker, J.M., Reicosky, D. 2010. Ethylene: Potential Key for Biochar Amendment Impacts. Plant and Soil Journal. 333:443-452.
Impacts of Biochar Additions on Soil Microbial Processes and Nitrogen Cycling - (Abstract Only) - (13-Mar-10)
Impacts of Strobilurin Fungicides on Yield and Soil Microbial Processes for Minnesota Strawberry Production - (Trade Journal)
Spokas, K.A., Jacobson, B. 2010. Impacts of Strobilurin Fungicides on Yield and Soil Microbial Processes for Minnesota Strawberry Production. Minnesota Fruit and Vegetable Growers Association. January 21-22, 2010. St. Cloud, MN. pp. 25-29.
Limits and dynamics of methane oxidation in landfill cover soils Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Bogner, J. 2011. Limits and dynamics of methane oxidation in landfill cover soils. Waste Management. 31(5):823-832.
Ipcc Methodologies for the Waste Sector: Past, Present, and Future - (Abstract Only)
Bogner, J., Spokas, K.A. 2009. IPCC Methodologies for the Waste Sector: Past, Present, and Future [abstract]. Oral Presentation for the DAKOFA/ISWA Waste & Climate Conference. Dec. 3-4, 2009. Copenhagen, Denmark. Parallel session 2: From life cycle thinking to acting Title: IPCC Methodologies for the Waste Sector: Past, Present, and Future. Online reference: http://www.wasteandclimate.org/DocumentDownloadServlet?id=85&language=en. On-line.
Impacts of Sixteen Different Biochars on Soil Greenhouse Gas Production - (Peer Reviewed Journal)
Spokas, K.A., Reicosky, D.C. 2009. Impacts of Sixteen Different Biochars on Soil Greenhouse Gas Production. Annals of Environmental Science. 3:179-193.
Landfill Methane - (Book / Chapter)
Bogner, J., Spokas, K.A. 2009. Landfill Methane. In: Reay, D., Smith, P., and van Amstel, A. Methane and Climate Change. Earthscan Ltd., London, UK. pp. 175-200.
A New IPCC Tier 4 Site-Specific Model for Landfill Methane Emissions Inclusive of Seasonal Methane Oxidation - (Proceedings)
Spokas, K.A., Bogner, J., Chanton, J. 2009. A New IPCC Tier 4 Site-Specific Model for Landfill Methane Emissions Inclusive of Seasonal Methane Oxidation. 6th Annual Climate Change Research Symposium, September 8-10, 2009, Sacramento, California. Available: http://www.climatechange.ca.gov/events/2009_symposium/index.html.
Developing a New Field-Validated Methodology for Landfill Methane Emissions in California - (Abstract Only)
Spokas, K.A., Bogner, J., Chanton, J., Franco, G. 2009. Developing a New Field-Validated Methodology for Landfill Methane Emissions in California [abstract]. Twelfth International Waste Management and Landfill Symposium. S. Margherita di Pula, Cagliari, Italy; Oct. 5-9, 2009. pp. 225-226.
Impacts of Woodchip Biochar Additions on Soil Carbon Net, CH4 Oxidation and Sorption/Degradation of Two Herbicides in a Minnesota Soil Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Koskinen, W.C., Baker, J.M., Reicosky, D.C. 2009. Impacts of Woodchip Biochar Additions on Soil Carbon Net, CH4 Oxidation and Sorption/Degradation of Two Herbicides in a Minnesota Soil. Chemosphere. 77(4):571-581.
Accuracy and Precision Analysis of Chamber-Based Nitrous Oxide Gas Flux Estimates - (Abstract Only)
Venterea, R.T., Spokas, K.A., Baker, J.M. 2009. Accuracy and Precision Analysis of Chamber-Based Nitrous Oxide Gas Flux Estimates [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. Paper No. 52.
Impact of Various Biochars on Greenhouse Gas Production Potentials - (Abstract Only)
Spokas, K.A., Reicosky, D.C. 2009. Impact of Various Biochars on Greenhouse Gas Production Potentials [abstract]. Meeting Abstract. On-line proceedings and recording of presentations. http://cees.colorado.edu/biochar_environment.html.
First-Order Decay Models to Describe Soil C-CO2 Loss After Rotary Tillage Reprint Icon - (Peer Reviewed Journal)
La Scala, N., Lopes, A., Spokas, K.A., Archer, D.W., Reicosky, D.C. 2009. First-Order Decay Models to Describe Soil C-CO2 Loss After Rotary Tillage. Scientia Agricola. 66(5):650-657.
Microbial Methane Oxidation Processes and Technologies for Mitigation of Landfill Gas Emissions Reprint Icon - (Peer Reviewed Journal)
Scheutz, C., Kjeldsen, P., Bogner, J.E., De Visscher, A., Gebert, J., Hilger, H.A., Huber-Humer, M., Spokas, K.A. 2009. Microbial Methane Oxidation Processes and Technologies for Mitigation of Landfill Gas Emissions. Waste Management and Research. 27(5):409-455.
Moving Up to the Top of the Landfill: A Field-Validated, Science-Based Methane Emissions Inventory Model for California Landfills - (Trade Journal)
Bogner, J., Spokas, K.A., Chanton, J., Franco, G. 2009. Moving Up to the Top of the Landfill: A Field-Validated, Science-Based Methane Emissions Inventory Model for California Landfills. MSW Management. 19(2):36-39.
Accuracy and Precision Analysis of Chamber-Based Nitrous Oxide Gas Flux Estimates Reprint Icon - (Peer Reviewed Journal)
Venterea, R.T., Spokas, K.A., Baker, J.M. 2009. Accuracy and Precision Analysis of Chamber-Based Nitrous Oxide Gas Flux Estimates. Soil Science Society of America Journal. 73(4):1087-1093.
Software Tools for Weed Seed Germination Modeling Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Forcella, F. 2009. Software Tools for Weed Seed Germination Modeling. Weed Science. 57(2):216-227.
Short-term temporal changes of bare soil CO2 fluxes described by first-order decay models Reprint Icon - (Peer Reviewed Journal)
La Scala, N., Lopes, A., Spokas, K.A., Archer, D.W., Reicosky, D.C. 2009. Short-Term Temporal Changes of Bare Soil CO2 Fluxes Described by First-Order Decay Models. European Journal of Soil Science. 60(2):258-264.
Soil Processes and Residue Harvest Management Reprint Icon - (Book / Chapter)
Johnson, J.M., Papiernik, S.K., Mikha, M.M., Spokas, K.A., Tomer, M.D., Weyers, S.L. 2009. Soil Processes and Residue Harvest Management. In: Lal, R., Stewart, B.A., editors. Soil Quality and Biofuel Production. Advances in Soil Science. Boca Raton, FL: CRC Press. p. 1-44.
Critical plant life-history trait linkage to weather, management, and clients - (Abstract Only)
Forcella, F., Gramig, G.G., Spokas, K.A., Bredeson, C. 2008. Critical plant life-history trait linkage to weather, management, and clients [abstract]. The Ecological Society of America. Paper No. P9091.
Construction of an electrical device for sampling earthworm populations in the field Reprint Icon - (Peer Reviewed Journal)
Lachnicht Weyers, S.L., Schomberg, H.H., Hendrix, P.F., Spokas, K.A., Endale, D.M. 2008. Construction of an electrical device for sampling earthworm populations in the field. Applied Engineering in Agriculture. 24(3):391-397.
A hydrothermal seedling emergence model for giant ragweed (Ambrosia trifida) Reprint Icon - (Peer Reviewed Journal)
Schutte, B.J., Regnier, E.E., Harrison, S.K., Schmoll, J.T., Spokas, K.A., Forcella, F. 2008. A hydrothermal seedling emergence model for giant ragweed (Ambrosia trifida). Weed Science. 56:555-560.
Short-term temporal changes of soil carbon losses after tillage described by a first-order decay model Reprint Icon - (Peer Reviewed Journal)
La Scala, Jr., N., Lopes, A., Spokas, K.A., Bolonhezi, D., Archer, D.W., Reicosky, D.C. 2008. Short-term temporal changes of soil carbon losses after tillage described by a first-order decay model. Soil & Tillage Research. 99:108-118.
Plastics: Still young, but having a mature impact - (Other)
Spokas, K.A. 2007. Plastics: Still young, but having a mature impact. Waste Management. 28(3):473-474.
Emergence Prediction of Common Groundsel (Senecio vulgaris) Reprint Icon - (Peer Reviewed Journal)
Mcgiffin, M., Spokas, K.A., Forcella, F., Archer, D.W., Poppe, S., Figueroa, R. 2008. Emergence prediction of common groundsel (Senecio vulgaris). Weed Science. 56:58-65.
Short-term temporal changes of bare soil CO2 fluxes after tillage described by a first-order decay model - (Abstract Only)
La Scala, N., Lopes, A., Spokas, K.A., Archer, D.W., Reicosky, D.C. 2007. Short-term temporal changes of bare soil CO2 fluxes after tillage described by a first-order decay model. Proceedings of the International Symposium on Organic Matter Dynamics in Agro-Ecosystems. July 16-19, 2007, Poitiers, France. I:98-99.
Effects of soil fumigants on methanotrophic activity Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., King, J., Wang, D., Papiernik, S.K. 2007. Effects of soil fumigants on methanotrophic activity. Atmospheric Environment. 41:8150-8162.
An Emergence Model for Wild Oat (Avena fatua) Reprint Icon - (Peer Reviewed Journal)
Martinson, K., Durgan, B., Forcella, F., Wiersma, J., Spokas, K.A., Archer, D.W. 2007. An Emergence Model for Wild Oat (Avena fatua). Weed Science. 55:584-591.
Sorption and predicted mobility of herbicides in Baltic soils - (Peer Reviewed Journal)
Sakaliene, O., Papiernik, S.K., Koskinen, W.C., Spokas, K.A. 2007. Sorption and predicted mobility of herbicides in Baltic soils. Journal of Environmental Science and Health Part B. 42:641-647.
Improving weed germination models by incorporating seed microclimate and translocation by tillage - (Abstract Only)
Spokas, K.A., Forcella, F., Archer, D.W., Peterson, D.H., Miller, S.W. 2007. Improving weed germination models by incorporating seed microclimate and translocation by tillage [abstract]. Weed Science Society of America. Available: http://www.wssa.net.
Canada Thistle Phenology: Emergence, Growth, Anthesis, and Death of Shoots - (Abstract Only)
Forcella, F., Archer, D.W., Spokas, K.A. 2007. Canada Thistle Phenology: Emergence, Growth, Anthesis, and Death of Shoots [Abstract]. Weed Science Society of America. Available: http://www.wssa.net.
Predicting late-season emergence for improved giant ragweed (Ambrosia trifida) management in Ohio - (Abstract Only)
Schutte, B.J., Regnier, E.E., Harrison, S.K., Schmoll, J.T., Forcella, F., Spokas, K.A. 2007. Predicting late-season emergence for improved giant ragweed (Ambrosia trifida) management in Ohio [abstract]. Weed Science Society of America. Available: http://www.wssa.net.
SeedChaser: Vertical soil tillage distribution model Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Forcella, F., Archer, D.W., Reicosky, D.C. 2007. SeedChaser: Vertical Soil Tillage Distribution Model. Computers and Electronics in Agriculture. 57:62-73.
Methane: Signs of Progress along the Road Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A. 2007. Methane: Signs of progress along the road [Editorial]. Waste Management. 27(4):459-460.
Mathematical simulation of soil microclimate conditions for predicting weed seed germination Reprint Icon - (Abstract Only)
Spokas, K.A., Forcella, F. 2006. Mathematical simulation of soil microclimate conditions for predicting weed seed germination [abstract][CD-ROM]. North Central Weed Science Society Proceedings. 61:89.
Experimental cylinder comparisons for monitoring seedling emergence Reprint Icon - (Abstract Only)
Spokas, K.A., Forcella, F., Archer, D.W., Peterson, D.H. 2006. Experimental cylinder comparisons for monitoring seedling emergence [abstract][CD-ROM]. North Central Weed Science Society Proceedings. 61:79.
Swathing and windrowing as harvest aids for cuphea Reprint Icon - (Peer Reviewed Journal)
Forcella, F., Spokas, K.A., Gesch, R.W., Isbell, T., Archer, D.W. 2007. Swathing and Windrowing as Harvest Aids for Cuphea. Agronomy Journal. 99: 415-418.
Landfill Gas Measurement Methods - (Abstract Only) - (14-Jun-06)
Carbon and Nitrogen Storage Are Greater under Biennial Tillage in a Minnesota Corn-Soybean Rotation Reprint Icon - (Peer Reviewed Journal)
Venterea, R.T., Baker, J.M., Dolan, M.S., Spokas, K.A. 2006. Carbon and nitrogen storage are greater under biennial tillage in a Minnesota corn-soybean rotation. Soil Science Society of America Journal. 70:1752-1762.
Seedchaser: Tillage Model for Vertical Weed Seed Distribution - (Abstract Only)
Spokas, K.A., Forcella, F., Peterson, D.H., Archer, D.W., Reicosky, D.C. 2005. Seedchaser: Tillage model for vertical weed seed distribution [abstract]. North Central Weed Science Society. 60:142.
Seedling Emergence of Row Crops and Weeds Across Five Tillage Systems - (Abstract Only)
Peterson, D.H., Spokas, K.A., Forcella, F., Reicosky, D.C., Wente, C.D. 2005. Seedling emergence of row crops and weeds across five tillage systems [abstract]. North Central Weed Science Society. 60:74.
Seedchaser: Tillage Model for Vertical Weed Seed Distribution - (Abstract Only)
Spokas, K.A., Forcella, F., Peterson, D.H., Archer, D.W., Reicosky, D.C. 2005. Seedchaser: Tillage model for vertical weed seed distribution [abstract][CD-ROM]. ASA-CSSA-SSSA Annual Meeting Abstracts. ASA-CSSA-SSSA Annual Meeting. Nov. 6-10, 2005, Salt Lake City, UT.
Estimating Hourly Incoming Solar Radiation from Limited Meteorological Data Reprint Icon - (Peer Reviewed Journal)
Spokas, K.A., Forcella, F. 2006. Estimating hourly incoming solar radiation from limited meteorological data. Weed Science. 54:182-189.
Degradation of Methyl Isothiocyanate and Chloropicrin in Forest Nursery Soils - (Peer Reviewed Journal)
Zhang, Y., Spokas, K.A., Wang, D. 2005. Degradation of methyl isothiocyanate and chloropicrin in forest nursery soils. Journal of Environmental Quality. 34:1566-1572.
Nitrogen Oxide and Methane Emissions under Varying Tillage and Fertilizer Management Reprint Icon - (Peer Reviewed Journal)
Venterea, R.T., Burger, M., Spokas, K.A. 2005. Nitrogen oxide and methane emissions under varying tillage and fertilizer management. Journal of Environmental Quality. 34:1467-1477.
Nitrous Oxide and Methane Emissions under Varying Tillage and Fertiizer Management - (Abstract Only)
Venterea, R.T., Burger, M., Spokas, K.A. 2005. Nitrous oxide and methane emissions under varying tillage and fertiizer management. USDA Symposium on Greenhouse Gases & Carbon Sequestration in Agriculture and Forestry, March 21-24, 2005, Baltimore, Maryland. p. 237.
Last Modified: 11/19/2013