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United States Department of Agriculture

Agricultural Research Service

TIMOTHY PARKIN (TIM)

Research Microbiologist

 

 

Education

Ph.D.

1980

Bacteriology/Water Chemistry - University of Wisconsin, Madison, Wisconsin

M.S.

1978

Bacteriology - University of Wisconsin, Madison, Wisconsin

B.A.

1976

Biology (cum laude) - Wabash College, Crawfordsville, Indiana

 

Professional Experience

1980 - 1983

Research Associate, Michigan State University, East Lansing, MI (Joint appointment in the department of Crop and Soil Sciences and the department of Microbiology and Public Health)

1983 - 1990

Research Microbiologist, Soil Nitrogen and Environmental Chemistry Laboratory, USDA-ARS, Beltsville, MD

1990 - 2002

Research Microbiologist, National Soil Tilth Laboratory, USDA-ARS, Ames, IA.

2002 - 2009

Research Leader, Air Quality of Agricultural Systems Research Unit, NSTL, USDA-ARS, Ames, IA.

2009 - Present

Research Microbiologist, National Laboratory for Agriculture and the Environment, U.S. Department of Agriculture-ARS, Ames, IA

 

Research Interests

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Microbial ecology of terrestrial systems in relation to C and N cycling.

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Agricultural management effects on greenhouse gas emissions from soil.

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Environmental controls on the temporal variability of greenhouse gas emissions.

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Development of methodology to measure soil denitrification and greenhouse gas production.

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Application of novel statistical approaches to the study of microbial ecology.

 

Publications

Rogovska, N., D. Laird, R. Cruse, P. Fleming, T. Parkin and D. Meek. 2011. Impact of biochar on manure carbon stabilization and greenhouse gas emissions. Soil Sci. Soc. Am. J. 75: http://ddr.nal.usda.gov/bitstream/10113/49774/1/IND44592288.pdf

Parkin, T.B. and R.T.  Venterea.  2010.  Chamber-Based Trace Gas Flux Measurements. IN Sampling Protocols. R.F. Follett, editor. p. 3-1 to 3-39. http://www.ars.usda.gov/SP2UserFiles/Program/212/Chapter%203.%20GRACEnet%20Trace%20Gas%20Sampling%20Protocols.pdf

Parkin, T.B.   and J.L. Hatfield 2010. Influence of nitrapyrin on Nâ‚‚O losses from soil receiving fall-applied anhydrous ammonia.   Agriculture, ecosystems & environment. 2010 Feb. 15, v. 136, no. 1-2 Amsterdam; New York: Elsevier, p. 81-86.   http://ddr.nal.usda.gov/dspace/bitstream/10113/40268/1/IND44319834.pdf

Kim, D.-G., T.M. Isenhart, T.B. Parkin, R.C. Schultz and T.E. Loynachan. 2010. Methane Flux in Cropland and Adjacent Riparian Buffers with Different Vegetation Covers. Journal of environmental quality. 2010 Jan-Feb, v. 39, no. 1, p. 97-105.    http://ddr.nal.usda.gov/dspace/bitstream/10113/39413/1/IND44308832.pdf

Greenan, C.M., T.B. Moorman, T.B. Parkin, T.C. Kaspar and D.B. Jaynes. 2009. Denitrification in Wood Chip Bioreactors at Different Water Flows. Journal of environmental quality. 2009 July-Aug, v. 38, issue 4, p. 1664-1671.    http://ddr.nal.usda.gov/dspace/bitstream/10113/31760/1/IND44228946.pdf

Jarecki, M.K., T.B. Parkin, A.S.K. Chan, T.C. Kaspar, T.B. Moorman, J.W. Singer, B.J. Kerr, J.L. Hatfield and R. Jones. 2009.   Cover crop effects on nitrous oxide emission from a manure-treated Mollisol. Agriculture, ecosystems & environment. 2009 Nov., v. 134, no. 1-2 Amsterdam; New York: Elsevier, p. 29-35. http://ddr.nal.usda.gov/dspace/bitstream/10113/36837/1/IND44270445.pdf

Sauer, T.J., S.R. Compston, C.P. West, G. Hernandez-Ramirez, E.E. Gbur and T.B. Parkin. 2009. Nitrous oxide emissions from a bermudagrass pasture: Interseeded winter rye and poultry litter. Soil biology & biochemistry. 2009 July, v. 41, issue 7, p. 1417-1424. http://ddr.nal.usda.gov/dspace/bitstream/10113/32175/1/IND44216631.pdf

DeSutter, T.M., T.J. Sauer, T.B. Parkin and J.L. Heitman. 2008. A Subsurface, Closed-Loop System for Soil Carbon Dioxide and Its Application to the Gradient Efflux Approach. Soil Science Society of America journal. 2008 Jan-Feb, v. 72, no. 1, p. 126-134.   http://ddr.nal.usda.gov/bitstream/10113/11384/1/IND44011135.pdf

Jarecki, M.K., T.B. Parkin, A.S.K. Chan, J.L. Hatfield and R. Jones. 2008. Comparison of DAYCENT-Simulated and Measured Nitrous Oxide Emissions from a Corn Field.   Journal of environmental quality. 2008 Sept-Oct, v. 37, no. 5, p. 1685-1690.   http://ddr.nal.usda.gov/dspace/bitstream/10113/18932/1/IND44092374.pdf

Parkin, T.B.   2008. Effect of Sampling Frequency on Estimates of Cumulative Nitrous Oxide Emissions. Journal of environmental quality. 2008 July-Aug, v. 37, no. 4, p. 1390-1395.     http://ddr.nal.usda.gov/dspace/bitstream/10113/16786/1/IND44074110.pdf

J Jarecki, M.K., T.B. Parkin, A.S.K. Chan, J.L. Hatfield and R. Jones.   2008. Greenhouse Gas Emissions from Two Soils Receiving Nitrogen Fertilizer and Swine Manure Slurry. Journal of environmental quality. 2008 July-Aug, v. 37, no. 4, p. 1432-1438.   http://ddr.nal.usda.gov/dspace/bitstream/10113/16904/1/IND44074118.pdf

Jaynes, D.B., T.C. Kaspar, T.B. Moorman and   T.B. Parkin. 2008. In Situ Bioreactors and Deep Drain-Pipe Installation to Reduce Nitrate Losses in Artificially Drained Fields. Journal of environmental quality. 2008 Mar-Apr, v. 37, no. 2, p. 429-436. http://ddr.nal.usda.gov/dspace/bitstream/10113/17912/1/IND44027754.pdf

Kaspar, T.C., D.B. Jaynes, D.B., T.B. Parkin and T.B. Moorman.   2007. Rye Cover Crop and Gamagrass Strip Effects on NO3 Concentration and Load in Tile Drainage. Journal of environmental quality. 2007 Sept-Oct, v. 36, no. 5, p. 1503-1511.    http://ddr.nal.usda.gov/dspace/bitstream/10113/14937/1/IND43996395.pdf

Franzluebbers, A.J., R.F Follett, J.M.F. Johnson, M.A. Liebig, E.G. Gregorich, T.B. Parkin, J.L. Smith, S.J. Del Grosso, M.D. Jawson, and D.A. Martens. 2007. Agricultural exhaust: a reason to invest in soil. Journal of soil and water conservation. 2006 May-June, v. 61, no. 3, p. 98A-101A. http://ddr.nal.usda.gov/dspace/bitstream/10113/47523/1/IND43832337.pdf

Desutter, T.M., T.J. Sauer and T.B. Parkin.   2006. Porous tubing for use in monitoring soil CO2 concentrations. Soil biology & biochemistry. 2006 Sept., v. 38, issue 9, p. 2676-2681.    http://ddr.nal.usda.gov/dspace/bitstream/10113/6871/1/IND43840636.pdf

Greenan, C.M., T.B. Moorman, T.C. Kaspar, T.B. Parkin and D.B. Jaynes. 2006. Comparing carbon substrates for denitrification of subsurface drainage water. Journal of environmental quality. 2006 May-June, v. 35, no. 3, p. 824-829. http://ddr.nal.usda.gov/bitstream/10113/2964/1/IND43857307.pdf

Kaspar, T.C., T.B. Parkin, T.B., D.B. Jaynes, D.B., C.A. Cambardella, D.W. Meek and Y.S. Jung. 2006. Examining Changes in Soil Organic Carbon with Oat and Rye Cover Crops Using Terrain Covariates. Soil Science Society of America journal. 2006 July-Aug, v. 70, no. 4, p. 1168-1177. http://ddr.nal.usda.gov/bitstream/10113/3944/1/IND43880793.pdf

Kerr, B.J., C.J. Ziemer, S.L. Trabue, J.D. Crouse and T.B. Parkin. 2006. Manure composition of swine as affected by dietary protein and cellulose concentrations. Journal of animal science. 2006 June, v. 84, no. 6 American Society of Animal Science, p. 1584-1592. http://ddr.nal.usda.gov/bitstream/10113/7957/1/IND43806571.pdf

Parkin, T.B. and T.C. Kaspar. 2006. Nitrous Oxide Emissions from Corn-Soybean Systems in the Midwest. Journal of environmental quality. 2006 July-Aug, v. 35, no. 4, p. 1496-1506.     http://ddr.nal.usda.gov/dspace/bitstream/10113/3940/1/IND43851954.pdf

Parkin, T.B., T.C. Kaspar and J.W. Singer. Cover crop effects on the fate of N following application of swine manure. 2006. Plant Soil. 289-141-152. http://ddr.nal.usda.gov/bitstream/10113/15472/1/IND43852841.pdf

Jawson, M.D., S.R Shafer, A.J. Franzluebbers, T.B. Parkin, and R.F. Follett 2005.   GRACEnet: Greenhouse gas reduction through agricultural carbon enhancement network. Soil & tillage research. 2005 Aug., v. 83, issue 1, p. 167-172. http://ddr.nal.usda.gov/dspace/bitstream/10113/7691/1/IND43728632.pdf

Russell, A.E., D.A. Laird, T.B. Parkin and A.P. Mallarino. 2005.   Impact of nitrogen fertilization and cropping system on carbon sequestration in midwestern Mollisols.   Soil Science Society of America journal. 2005 Mar-Apr, v. 69, no. 2, p. 413-422. http://ddr.nal.usda.gov/dspace/bitstream/10113/4086/1/IND43702263.pdf

Parkin, T.B., T.C. Kaspar, Z. Senwo, J.H. Prueger and J.L. Hatfield.   2005. Relationship of soil respiration to crop and landscape in the Walnut Creek watershed. Journal of hydrometeorology. 2005 Dec., v. 6, issue 6, p. 812-824.    http://ddr.nal.usda.gov/dspace/bitstream/10113/22307/1/IND44132916.pdf

Prueger, J.H., J.L. Hatfield, W.P. Kustas, L.E. Hipps, J.I. MacPherson, C.M.U. Neale, W.E. Eichinger, D.I. Cooper and T.B. Parkin. 2005. Tower and Aircraft Eddy Covariance Measurements of Water Vapor, Energy, and Carbon Dioxide Fluxes during SMACEX. Journal of hydrometeorology. 2005 Dec., v. 6, issue 6, p. 954-960. http://ddr.nal.usda.gov/dspace/bitstream/10113/22743/1/IND44132942.pdf

Prueger, J.H., J.L. Hatfield, T.B. Parkin, T.B., W.P. Kustas and T.C. Kaspar. 2004. Carbon Dioxide Dynamics During a Growing Season in Midwestern Cropping Systems. Environmental management. 2004 July, v. 33, suppl. 1, p. S330-S343. http://ddr.nal.usda.gov/dspace/bitstream/10113/40740/1/IND44353204.pdf

Harper, L.A., R.R. Sharpe, T.B. Parkin, A. de Visscher, O van Cleemput and F.M. Byers. 2004. Nitrogen cycling through swine production systems: ammonia, dinitrogen, and nitrous oxide emissions. Journal of environmental quality. 2004 July-Aug, v. 33, no. 4, p. 1189-1201.     http://ddr.nal.usda.gov/dspace/bitstream/10113/9037/1/IND43637829.pdf

Parkin, T.B. and T.C. Kaspar. 2004. Temporal variability of soil carbon dioxide flux: effect of sampling frequency on cumulative carbon loss estimation. Soil Science Society of America journal. 2004 July-Aug, v. 68, no. 4, p. 1234-1241.    http://ddr.nal.usda.gov/dspace/bitstream/10113/9453/1/IND43702391.pdf

Parkin, T.B., T.C. Kaspar and C.A. Cambardella. 2002. Oat plant effects on net nitrogen mineralization. Plant and soil. June 2002. v. 243 (2), p. 187-195. Communications in soil science and plant analysis. 2001. v. 32 (17/18), P. 2795-2807. http://ddr.nal.usda.gov/dspace/bitstream/10113/15418/1/IND23299989.pdf

Arnold, S.L., T.B. Parkin, J.W. Doran, B. Eghball and A.R. Mosier. 2001. Automated gas sampling system for laboratory analysis of CH4 and N2O.   http://ddr.nal.usda.gov/dspace/bitstream/10113/16720/1/IND23277193.pdf

Chan, A.S.K. and T.B. Parkin. 2001. Effect of land use on methane flux from soil.   Journal of environmental quality. May/June 2001. v. 30 (3), p. 786-797. http://ddr.nal.usda.gov/dspace/bitstream/10113/23678/1/IND23334086.pdf

http://ddr.nal.usda.gov/bitstream/10113/49185/1/IND23233905.pdf. 2001. Methane oxidation and production activity in soils from natural and agricultural ecosystems. Journal of environmental quality. Nov/Dec 2001. v. 30 (6), p. 1896-1903. http://ddr.nal.usda.gov/dspace/bitstream/10113/23675/1/IND23332466.pdf

Chan, A.S.K. and T.B. Parkin. 2000. Evaluation of potential inhibitors of methanogenesis and methane oxidation in a landfill cover soil. Soil biology & biochemistry. Oct 2000. v. 32 (11/12), p. 1581-1590. http://ddr.nal.usda.gov/bitstream/10113/49186/1/IND23252912.pdf

Harper, L.A, R.R. Sharpe and T.B. Parkin. 2000.   Gaseous nitrogen emissions from anaerobic swine lagoons: ammonia, nitrous oxide, and dinitrogen gas. Journal of environmental quality. July/Aug 2000. v. 29 (4), p. 1356-1365. http://ddr.nal.usda.gov/bitstream/10113/49185/1/IND23233905.pdf

Malpassi, R.N., T.C. Kaspar, T.C., T.B. Parkin, C.A. Cambardella and N.A. Nubel.   2000.    Oat and rye root decomposition effects on nitrogen mineralization. Soil Science Society of America journal. Jan/Feb 2000. v. 64 (1), p. 208-215. http://ddr.nal.usda.gov/bitstream/10113/49184/1/IND22069450.pdf

Stahl, P.D., T.B. Parkin and M.Christensen. 1999. Fungal presence in paired cultivated and uncultivated soils in central Iowa, USA. Biology and fertility of soils. 1999. v. 29 (1), p. 92-97. http://ddr.nal.usda.gov/bitstream/10113/49182/1/IND22020061.pdf

Parkin, T.B.   and E.C. Berry. 1999. Microbial nitrogen transformations in earthworm burrows. Soil biology & biochemistry. Nov 1999. v. 31 (13), p. 1765-1771. http://ddr.nal.usda.gov/bitstream/10113/49183/1/IND22048341.pdf

Kimber, A., W.G. Crumpton, T.B. Parkin and M.H. Spalding. 1999. Sediment as a carbon source for the submersed macrophyte Vallisneria.   Plant, cell and environ. 22:1595-1600.

Cambardella, C.A., T.B. Moorman, D.B. Jaynes, J.L. Hatfield, T.B. Parkin, W.W. Simpkins and D.L. Karlen. 1999.   Water quality in Walnut Creek Watershed: nitrate-nitrogen in soils, subsurface drainage water, and shallow groundwater. Journal of environmental quality. Jan/Feb 1999. v. 28 (1), p. 25-34. http://ddr.nal.usda.gov/bitstream/10113/49181/1/IND21998211.pdf

Chan, A.S.K., J.H. Prueger and T.B. Parkin. 1998.   Comparison of closed-chamber and Bowen-ratio methods for determining methane flux from peatland surfaces. Journal of environmental quality. Jan/Feb 1998. v. 27 (1), p. 232-239. http://ddr.nal.usda.gov/bitstream/10113/49180/1/IND21243152.pdf

Bragan, R.J., J.L. Starr and T.B. Parkin. 1997. Acetylene transport in shallow groundwater for denitrification rate measurement.   Journal of environmental quality. Nov/Dec 1997. v. 26 (6), p. 1524-1530.   http://ddr.nal.usda.gov/bitstream/10113/49178/1/IND21237075.pdf

Bragan, R.J., J.L. Starr and T.B. Parkin. 1997. Shallow groundwater denitrification rate measurement by acetylene block. Journal of environmental quality. Nov/Dec 1997. v. 26 (6), p. 1531-1538. http://ddr.nal.usda.gov/bitstream/10113/49179/1/IND21237077.pdf

Parkin, T.B., J.W. Doran and E. Franco-Vizcaino. 1996.   Field and laboratory tests of soil respiration.   Methods for assessing soil quality / editors, John W. Doran and Alice J. Jones ; editorial committee, Richard P. Dick ... [et al.] ; editor-in-chief SSSA, Jerry M. Bigham ; managing editor, David M. Kral ; associate editor, Marian K. Viney. Madison, Wis., USA : Soil Science Society of America, 1996., p. 231-245.   http://ddr.nal.usda.gov/dspace/bitstream/10113/17270/1/IND44081354.pdf

Stahl, P.D. and T.B. Parkin. 1996. Microbial production of volatile organic compounds in soil microcosms.   Soil Science Society of America journal. May/June 1996. v. 60 (3), p. 821-828.   http://ddr.nal.usda.gov/bitstream/10113/49176/1/IND20525485.pdf

Doran, J.W. and T.B. Parkin 1996. Quantitative indicators of soil quality: a minimum data set. Methods for assessing soil quality / editors, John W. Doran and Alice J. Jones ; editorial committee, Richard P. Dick ... [et al.] ; editor-in-chief SSSA, Jerry M. Bigham ; managing editor, David M. Kral ; associate editor, Marian K. Viney. Madison, Wis., USA : Soil Science Society of America, 1996., p. 25-37. http://ddr.nal.usda.gov/dspace/bitstream/10113/17268/1/IND44081287.pdf

Stahl, P.D. and T.B. Parkin.   1996.   Relationship of soil ergosterol concentration and fungal biomass.   Soil biology & biochemistry. July 1996. v. 28 (7), p. 847-855.   http://ddr.nal.usda.gov/bitstream/10113/49188/1/IND20544755.pdf

Eash, N.S., P.D. Stahl, T.B. Parkin and D.L. Karlen. 1996.   A simplified method for extraction of ergosterol from soil. Soil Science Society of America journal. Mar/Apr 1996. v. 60 (2), p. 468-471. http://ddr.nal.usda.gov/bitstream/10113/49175/1/IND20519612.pdf

Starr, J.L., A.M. Sadeghi, T.B. Parkin, T.B., J.J. Meisinger and   J.L. Starr. 1996.   A tracer test to determine the fate of nitrate in shallow groundwater.   Journal of environmental quality. July/Aug 1996. v. 25 (4), p. 917-923.   http://ddr.nal.usda.gov/bitstream/10113/49177/1/IND20581898.pdf

Parkin, T.B.   and W.W. Simpkins. 1995. Contemporary groundwater methane production from pleistocene carbon. Journal of environmental quality. Mar/Apr 1995. v. 24 (2), p. 367-372. http://ddr.nal.usda.gov/bitstream/10113/49174/1/IND20500805.pdf

Starr, J.L., T.B. Parkin and J.J. Meisinger. 1995. Influence of sample size on chemical and physical soil measurements. Soil Sci. Soc. Am. j. May/June 1995. v. 59 (3)    p. 713-719. http://ddr.nal.usda.gov/bitstream/10113/49173/1/IND20466528.pdf

Stahl, P.D., T.B. Parkin and N.S. Eash. 1995.   Sources of error in direct microscopic methods for estimation of fungal biomass in soil.   Soil biology & biochemistry. Aug 1995. v. 27 (8), p. 1091-1097.   http://ddr.nal.usda.gov/dspace/bitstream/10113/35679/1/IND20478445.pdf

Simpkins, W.W., T.B. Parkin, B.B. Moorman and M.R. Burkart. 1995. Subsurface geology: a key to understanding water quality problems. Clean water, clean environment, 21st century : team agriculture, working to protect water resources : conference proceedings, March 5-8, 1995, Kansas City, Missouri / St. Joseph, Mich. : ASAE, c1995.    v. 3 p. 251-254.

Doran J.W. and T.B Parkin 1994. Defining and assessing soil quality. SSSA special publication. 1994. (35), p. 3-21.   http://ddr.nal.usda.gov/dspace/bitstream/10113/16818/1/IND20421118.pdf

Cambardella, C.A., T.B. Moorman, J.M. Novak, T.B. Parkin, D.L. Karlen, R.F. Turco and A.E. Konopka.   1994. Field-scale variability of soil properties in central Iowa soils. Soil Science Society of America journal. Sept/Oct 1994. v. 58 (5), p. 1501-1511. http://ddr.nal.usda.gov/bitstream/10113/18168/1/IND20518015.pdf

Eash, N.S., D.L. Karlen and T.B. Parkin. 1994. Fungal contributions to soil quality. SSSA special publication. SSSA spec. publ. 1994. (35)   p. 221-228. http://ddr.nal.usda.gov/bitstream/10113/49220/1/IND20421197.pdf

Parkin, T.B. and D.R. Shelton. 1994. Modeling environmental effects on enhanced carbofuran degradation. Pesticide science   Feb 1994. v. 40 (2)   p. 163-168. http://ddr.nal.usda.gov/bitstream/10113/49197/1/IND20406162.pdf

Parkin, T.B.   and E.C. Berry. 1994.   Nitrogen transformations associated with earthworm casts. Soil biology & biochemistry. Sept 1994. v. 26 (9), p. 1233-1238.   http://ddr.nal.usda.gov/dspace/bitstream/10113/35483/1/IND20433319.pdf

Stahl, P.D. and T.B. Parkin. 1994. Purge-and-trap extraction of geosmin and 2-methylisoborneol from soil. Soil Sci. Soc. Am. j. July/Aug 1994. v. 58 (4)   p. 1163-1167. http://ddr.nal.usda.gov/bitstream/10113/49172/1/IND20429196.pdf

Simpkins, W.W., T.B. Parkin, A.R. Ariffin, B.L. Johnson and Z. Qiu. 1993. Application of isotope, major and trace element geochemistry to assess groundwater contamination potential in the Walnut Creek Basin. Agricultural research to protect water quality : proceedings of the conference February 21-24, 1993 Minneapolis, Minnesota, USA / Ankeny, IA : The Society, [1993]    p. 541-544.

Parkin, T.B. 1993. Evaluation of statistical methods for determining differences between samples from lognormal populations. Agron. j. May/June 1993. v. 85 (3)   p. 747-753. http://ddr.nal.usda.gov/bitstream/10113/49171/1/IND20371772.pdf

Simpkins, W.W. and T.B. Parkin. 1993. Hydrogeology and redox geochemistry of CH4 in a late Wisconsinan till and loess sequence in central Iowa. Water resour. res. Nov 1993. v. 29 (11)   p. 3643-3657. http://ddr.nal.usda.gov/bitstream/10113/49187/1/IND20406537.pdf

Parkin, T.B. 1993. Spatial variability of microbial processes in soil--a review. J. environ. qual. July/Sept 1993. v. 22 (3)   p. 409-417. http://ddr.nal.usda.gov/bitstream/10113/49170/1/IND20366964.pdf

Parkin, T.B. and J.A. Robinson. 1993. Statistical evaluation of median estimators for lognormally distributed variables. Soil Sci. Soc. Am. j. Mar/Apr 1993. v. 57 (2)   p. 317-323. http://ddr.nal.usda.gov/bitstream/10113/49169/1/IND20359338.pdf

Parkin, T.B. and J.A. Robinson. 1992. Analysis of lognormal data. Advances in soil sciences. Adv Soil Sci 1992. v. 20   p. 193-235.

Parkin, T.B. and D.R. Shelton. 1992. Spatial and temporal variation of carbofuran degradation in soil. J Environ Qual Oct/Dec 1992. v. 21 (4)   p. 672-678. http://ddr.nal.usda.gov/bitstream/10113/49168/1/IND93034248.pdf

Shelton, D.R. and T.B. Parkin. 1991. Effect of moisture on sorption and biodegradation of carbofuran in soil. J Agric Food Chem Nov 1991. v. 39 (11)   p. 2063-2068. SUBMITTED to NAL 6/21/11

Parkin, T.B., D.R. Shelton and J.A. Robinson. 1991. Evaluation of methods for characterizing carbofuran hydrolysis in soil. J Environ Qual Oct/Dec 1991. v. 20 (4)   p. 763-769. http://ddr.nal.usda.gov/bitstream/10113/49167/1/IND92031661.pdf

Starr, J.L., Meisinger, J.J. and T.B. Parkin. 1991. Experiences and knowledge gained from vadose zone sampling. ACS Symposium series - American Chemical Society. A C S Symp Ser Am Chem Soc 1991. (465)   p. 279-289.

Parkin, T.B., S.T.   Chester and J.A. Robinson. 1990. Calculating confidence intervals for the mean of a lognormally distributed variable. Soil Sci Soc Am J Mar/Apr 1990. v. 54 (2)   p. 321-326. http://ddr.nal.usda.gov/bitstream/10113/49166/1/IND90036281.pdf

Parkin, T.B. 1990. Characterizing the variability of soil denitrification. FEMS symposium - Federation of European Microbiological Societies. F E M S Symp Fed Eur Microbiol Soc 1990. (56)   p. 213-228.

Parkin, T.B. and E.E. Codling. 1990. Rainfall distribution under a corn canopy: implications for managing agrochemicals. Agron J Nov/Dec 1990. v. 82 (6)   p. 1166-1169.

Parkin, T.B. and J.J. Meisinger. 1989. Denitrification below the crop rooting zone as influenced by surface tillage. J Environ Qual Jan/Mar 1989. v. 18 (1)   p. 12-16. http://ddr.nal.usda.gov/bitstream/10113/49165/1/IND89015506.pdf

Parkin, T.B. and J.A. Robinson. 1989. Stochastic models of soil denitrification. Appl Environ Microbiol Jan 1989. v. 55 (1)   p. 72-77. http://ddr.nal.usda.gov/bitstream/10113/49164/1/IND89014376.pdf

Parkin, T.B., J.J. Meisinger, S.T. Chester, J.L. Starr and J.A. Robinson. 1988. Evaluation of statistical estimation methods for lognormally distributed variables. Soil Sci Soc Am J Mar/Apr 1988. v. 52 (2) p. 323-329. http://ddr.nal.usda.gov/bitstream/10113/49159/1/IND88005917.pdf

Parkin, T.B. and E.E. Codling. 1988. Nonbiological nitrous oxide production from vadose soil catalyzed by galvanized steel tubing. Soil Sci Soc Am J Nov/Dec 1988. v. 52 (6)   p. 1621-1623. http://ddr.nal.usda.gov/bitstream/10113/49163/1/IND89014209.pdf

Parkin, T.B., J.L. Starr and J.J. Meisinger. 1987. Influence of sample size on measurement of soil denitrification. Soil Sci Soc Am J Nov/Dec 1987. v. 51 (6)   p. 1492-1501. http://ddr.nal.usda.gov/bitstream/10113/49158/1/IND87109210.pdf

Parkin, T.B. 1987. Soil microsites as a source of denitrification variability. Soil Sci Soc Am J Sept/Oct 1987. v. 51 (5)   p. 1194-1199. http://ddr.nal.usda.gov/bitstream/10113/49162/1/IND89046997.pdf

Parkin, T.B., A.J. Sexstone, and J.M. Tiedje. Adaptation of denitrifying populations to low soil pH. Applied Environ Microbiol May 1985a. v. 49 (5)   p. 1053-0156. http://ddr.nal.usda.gov/bitstream/10113/49161/1/ADL85054222.PDF

Parkin, T.B. 1985. Automated analysis of nitrous oxide. J Soil Sci Soc Am Jan/Feb 1985. v. 49 (1)   p. 273-276. http://ddr.nal.usda.gov/bitstream/10113/49160/1/IND85031672.pdf

Parkin, T.B., A.J. Sexstone and J.M. Tideje. 1985b. Comparison of field dentrification rates determined by acetylene-based soil core and nitrogen-15 methods. J Soil Sci Soc Am Jan/Feb 1985. v. 49 (1)   p. 94-99.

Sexstone, A.J., N.P. Revsbech, T.B. Parkin and J.M. Tiedje. 1985. Direct measurement of oxygen profiles an denitrification rates in soil aggregates. J Soil Sci Soc Am May/June 1985. v. 49 (3)   p. 645-651.

Sexstone, A.J., T.B. Parkin and J.M. Tiedje. 1985. Temporal response of soil denitrification rates to rainfall and irrigation. J Soil Sci Soc Am Jan/Feb 1985. v. 49 (1)   p. 99-103.

Tiedje, J.M., A.J. Sexstone, T.B. Parkin, N.P. Revsbech, and D.R. Shelton. 1984. Anaerobic processes in soil.    Plant Soil 1984. v. 76 (1/3)   p. 197-212.

Parkin, T.B. and J.M. Tiedje. 1984. Application of a soil core method to investigate the effect of oxygen concentration on denitrification. Soil Biol Biochem 1984. v. 16 (4)   p. 331-334.

Parkin, T.B., H.F. Kaspar, A.J. Sexstone, and J.M. Tiedje. 1984. A gas-flow core method to measure field denitrification rates. Soil Biol Biochem 1984. v. 16 (4)   p. 323-330.


Last Modified: 3/13/2012