Alvin J.M. Smucker
Professor of Soil Biophysics Voice: 517/355‑0271, ext. 251
Co-Director of National Needs Water Fax: 517/355‑0270
Science Fellows Program at MSU E‑mail: email@example.com
Department of Crop and Soil Sciences Website: http://www.msu.edu/~smucker
Primary Research Interests:
∑ Root C contributions to soil aggregate formation, function and stability
∑ Water quality in belowground plumes of riparian landscapes
∑ Phytoremediation of soils by root demographics and function
2004 Alexander von Humboldt Research Professor, Kiel,
2001-present Visiting Chair Professor of
1999-present Co-Director, National Needs Water Sciences Graduate Fellows at MSU
1999-present Visiting Research Soil Scientist, Argonne National Laboratories
Visiting Research Soil Scientist,
Root Physiologist, CSIRO Fellow,
Professor and Co‑chair,
2005- Distinguished Faculty Award at
2003-06 Alexander von Humboldt Research Award: Terrestrial Carbon Sequestration
2000 Senior Faculty Research Award, MSU Chapter of Sigma Xi Research Society
1998 Fellow, American Association for the Advancement of Science
1997 Fellow, Crop Science Society
1989 Fellow, American Society of Agronomy
1989 Fellow, Soil Science Society
1988 Peruvian Soil Research Distinguished Service Award
1988 Intíl Atomic Energy Agency Soil/Root Instruction Award
1988-89 President, MSU Chapter of Sigma Xi Research Society
1987-88 Distinguished MacMaster Research Fellow,
1971-74 Co-Chair, Soil Science Department,
Agricultural Sciences, INTA,
Memberships and Honorary Societies:
∑ 1976-present American Association for the Advancement of Science (AAAS)
∑ 1968-present Amer. Society of Soil Science (SSSA)
∑ 1968-present Amer. Society of Agronomy ASA)
∑ 1979-02 Crop Sci. Society of Amer.(CSSA)
∑ 1968-present Intíl. Soil Sci. Society (ISSS)
∑ 1969-present Sigma Xi Research Society
Panel Reviews: USDA/NRICGP; NSF/Soil Processes, Managed Ecosystems; USAID /BARD/SBIR; NSF/Ecosystems/SBIR; USDA/CRDF; German DFG/DAAD; Switzerland NSF; Finland NAS; Italian NAS and FAO/IAEA
Journal Reviews: Soil Sci. Soc. Amer. J., J. Env. Qual., Nature, Science, Soil Biol. and Biochem., Vadose Zone J., Soil Science, Soil Ecology, Agron. J., Geoderma, Ann. Rev. Phytopath., Euphytica, and Crop Science
Soil Science Research:
Primary Research Interests and Achievements: Soil physical and biophysical modifications of plant root development and rhizosphere functions; biogeochemistry and biophysics of soil C sequestration by aggregates; intraaggregate pore geometries and connectivities, soil nitrification inhibition by epigallocatechins root responses to soil compaction, and anaerobic/toxic soil horizons; heavy metal flux rates and soil water quality surrounding Red Cedar River on the MSU campus (MSU-WATER) and the Great Lakes (Great Lakes Commission).
∑ Associated collaborative research included: below-ground food-chains among roots and microbes; mesofaunal bioassays of transgenic food crops, plant genetic modifications of root system architecture; soil diseases, plant root energy losses; and associated redistributions of plant photoassimilates due to accelerated root exudation processes in the rhizosphere.
Directed or co-directed research and/or instructional projects totaling $5.67 million during past 33 years. Interdisciplinary and collaborative research projects totaling more than $26.8 million.
Project director and/or PI of 3-5 research proposals annually by federal, state and industry agencies generating annual operating budgets ranging from $140,000 to $320,000. Participant in collaborative 20-year NSF/LTER, regional and international, and research programs.
Author or co‑author of more than 308 peer-reviewed journal articles, book chapters, conference proceedings, abstracts and research reports. Refereed journals, book chapters, papers, abstracts and posters are listed below.
Patents: Two patents have been licensed for commercial root separation processes (U.S. Patent No. 4,478,710 in 1984 and Canadian Patent No. 1,207,473 in 1986). The hydropneumatic elutriation system has become the global standard method of root extraction from soils for literally thousands of scientists in more than 25 countries. The second licensed patent is marketed as a trace evidence concentrator (TEC) of trace evidence at crime scenes for use by the forensic sciences.
First-time scientific discoveries by Smucker, et al:
∑ Root infection mechanisms to soil anaerobiosis (Smucker and Erickson, 1976)
∑ Hydropneumatic separation of roots from mineral soils (Smucker, et al., 1982)
∑ Combined soil compaction and plant genetic modifications of plant root demographics (Asady, et al., 1985).
∑ Web-based root image processing with residue eliminators (Smucker, et al., 1987)
∑ Biogeochemical gradients between exterior to interior regions of soil aggregates (Santos, et al., 1997)
∑ Root recolonization or root induced micropores, the rotation effect (Rasse and Smucker, 1998)
∑ Inhibition of soil nitrification processes by natural legume root epigallocatechins (Erickson, et al., 2000).
∑ Non-invasive X-ray synchrotron micro-imaging and high speed 3D image rendering of internal pore networks within soil aggregates. (Albee, et al., 2001).
Soil Science Teaching: (25%)
∑ Environmental Soil Biophysics; CSS 440 (more than 835 students have been enrolled since 1978)
∑ Environmental Soil Physics; CSS 840 (8 to 15 students enrolled during odd years, more than 143 students have been enrolled since 1985)
∑ Soil Management and Environmental Impacts; CSS 310; 27 to 38 students per year, since 2001.
∑ Developed New Research Option for Undergraduates; CSS 499, (2002-present), Placed four courses on Blackboard and now Angel website teaching (2000-04) Published three journal articles for teaching plant root-soil interactions, and developed an Instructional Graphics Systems with IBM (1982)
∑ Major and Co- advisor to 26 graduate students (15 Ph.D. and 11 MS). I have served on at least 117 graduate student mentoring committees from 11 departments and 4 Colleges at MSU. Eleven Ph.D. and M.S. graduate students and 3 research associates completed degree and research programs in the soil biophysics laboratories since 1998.
∑ Hired and trained more than 76 undergraduate students in my soil biophysics and root image processing laboratories, more than 44% were minority students during the period from 1975 to 2004.
∑ Mentor of at least 25 College Minority Apprentice Program (MAP) and University High School Honors Program for Minorities (1985-2003).
∑ Eight Research Associates and at least 26 visiting scientists have conducted significant collaborative research in my lab for periods of 2 months to 3 years.
∑ MSU Faculty Affairs Committee, Budget Subcommittee chair, 2000/01
∑ President of MSU Chapter of Sigma Xi, 1986, have served as membership chair
awards committee chair, banquet committee chair, and treasurer 1980-94
∑ College Advisory Council: 1984/86, 1992/94, 1997/98; Chair in 1984/85
∑ Deanís strategic planning and staff planning committees: 1992-94 and 2000/01
∑ Department Advisory Committee, 1978/79, 1985/86, 2000/01
∑ Departmental Graduate Programs Committee: 1976/78, 1982/85, 1991/93,
1997; Chair 1978/9 and 1982-84
∑ All University Electron Microscope Equipment Committee: 1982-1985
∑ Search committees for six new faculty in departments and college: 1974-02
Numerous research and journal review panels at MSU, state, federal and international agencies listed above.
∑ Served on 6 junior faculty mentoring committees in three departments, chair of two
∑ Served on a variety of boards and review committees, for local church, high school, and
community agencies. Consultant to three NGOs for international development
1974 to present
∑ Alexander von Humboldt Research Award, University of Kiel, Germany, 2003-06.
Visiting Chair Professor at
Scottish Agricultural College,
∑ Mentor to 23 international graduate and undergraduate students from
∑ Soil Science Department co-chair and professor of soil science for MSU Graduate
School in Buenos Aires, Argentina, 1971-74.
Signed Memoranda of
Understanding and/or conducted significant research programs between MSU and 6
international research and teaching institutions in
∑ Garnered at least $500,000 of collaborative research, workshop, and instructional
programs and consulted/presented invited seminars in more than 28 countries.
∑ Board member of Associates in Rural Enterprise Development
(ARED), an international NGO, 1994-present.
∑ Vice president of International Society of Root Research (ISRR)1994-present
International Collaboration: 1967 to present research papers on soil biophysical and root C activities, consulted, and coordinated research projects in at least 42 countries. Selected few presentations and projects
2004 Keynote presentation, Alexander von Humboldt Foundation annual
2003 Keynote presentations and consultant to OECD, Ismir and Turkey Soil Sci. Soc.
Keynote address to International Society of Root Research Conf.,
Coordinated and presented keynote paper for Soil C Sequestration
Conference in Agro-Forestry Workshop, ICRAF,
2001 Keynote address to DFG Soil C Sequestration Conference,
Annual lectures, research projects in soil C sequestration,
1999-01 Soil C accumulations in rhizospheres of agro-forestry project, ICRAF,
1998 Consultant for soil C sequestration in root zones of vineyards in
1999 Keynote paper to the Finnish Soil Science Society annual conference
1996-99 USAID Soil C and N in agroforestry systems in Africa Conferences, IITA,
1987-88 Root research of soil C and N,
1985&87 Root C, nutrients, and water quantification in agroforestry,
1985 Taught courses and consulted on soil and root science methods,
NSF Soil-Plant-Animal Continuum Nutrient Project in
1971-74 Presented 6 graduate soil science
courses, conducted research on no till, and mentored 5 graduate students on soil
research projects, INTA,
Research consultant and graduate education consultant in
Seven month research assignment on water retention by soils treated by
asphalt barriers for rice and sugar cane production, Taiwan Sugar Corporation,
New Instrument Developments and Discoveries:
∑ Designed first HPLC and associated protocols that identified nano and picomole quantities of amino acids in plant and soil extracts
∑ Designed and developed hydropneumatic elutriation system for separating plant
roots from mineral soils, patented and purchased by at least 200 labs.
∑ Expanded the elutriation system for crime scene use in the forensic sciences
∑ Developed new model of Soil Aggregate Erosion (SAE) chamber in
collaboration with Peak Industries,
converted the educational RHIZOGEN model that develops 2D graphic root growth displays to soil
compaction, soil water and soil fertility from DOS to
Windows environments, in collaboration with Dr. L. Wu, biological modeler, Land
Management Dept. of SAC in
∑ Co-Director of MSU Water Sciences Fellows Program: This program includes writing proposals in the amounts of $210K to $250K every two years, assembling a multidisciplinary core faculty of 12-14 MSU professors, confirming the presentation of 75 to 80 graduate-level courses in 8 departments at MSU, recruiting and reviewing 10-12 Ph.D. applications annually, assembling and chairing an executive committee who sets policy and approves applicants, the construction and maintenance of a website for the MSU Water Science Fellows Program. This position is responsible for communicating, record keeping of an on-going program of 11 Water Science Doctoral Fellows in 5 departments across the colleges of Agriculture and Natural Resources and Natural Sciences.
∑ Director of MSU Root Image Processing Laboratory (RIPL): This web-based computer plant root imaging analyses system http://rootimage.css.msu.edu/ analyzes root systems from washed samples and minirhizotron recordings of root systems in grassland, forest and agroecosystems throughout the Americas, in Europe, Australia, Japan, Turkey, Africa, India, etc. Computer algorithms were developed in collaboration with the NSF Pattern Recognition and Image Processing Laboratory in Computer Science and Engineering. Currently, this web-based RIPL is used by scientists and students from more than 15 countries.
∑ Director of Isotope Ratio Mass Spectrometer and C and N Analyses Laboratory. This lab services soil and plant research programs for at least 9 research faculty from four departments at MSU and several scientists across the USA and internationally. This fee-based facility analyzes approximately 4000 plant and soil materials annually.
Publications: Smuckerís soil biophysical and plant root research activities have resulted in more than 308 peer-reviewed journal articles, book chapters, conference proceedings, abstracts and research reports.
Eight most significant published contributions:
1. Smucker, A.J.M. and A.E. Erickson. 1976. An aseptic mist chamber system: A method for measuring root processes of peas. Agron. J. 68:59-62.
A.J.M. 1984. Carbon utilization and losses by
plant root systems. In: Roots, Nutrient and Water Influx, and Plant
Growth. Barber and Boulden, eds. Amer. Soc. Agron.,
3. Schumacher, T.E. and A.J.M. Smucker. 1985. Carbon transport and root respiration of split root systems of Phaseolus vulgaris subjected to short term localized anoxia. Plant Physiology 78:359-364.
4. Smucker, A.J.M. 1993. Soil environmental modifications of root dynamics and measurement. Annual Rev. Phytopathol. 31:191-216.
6. Rasse, D.P. and A.J.M. Smucker. 1998. Root recolonization of previous root channels in corn and alfalfa rotations. Plant and Soil 204:203-212.
8. Erickson, A.J., R.S. Ramsewak, A.J. M. Smucker and M.G. Nair. 2000. Nitrification inhibitors from the roots of Leucaena leucocephala. J. Agric. Food Chem. 48:6174-6177.
Refereed Journal Articles and Referred Book Chapters (including above 8)
1. Erickson, A.E., C.M. Hansen and A.J.M. Smucker. 1968. The influence of subsurface asphalt barriers on the water properties and the productivity of sand soils. 9th Intíl. Congress of Soil Science Transactions. Vol. 1, Paper 35, pp. 331-337.
Erickson, A.E., C.M. Hansen, A.J.M. Smucker, K.Y. Li, L.C. Hsi, T.S. Wang and R.L. Cook. 1968. Subsurface asphalt
barriers for the improvement of sugarcane production and the conservation of
water on sand soil. International Society of Sugarcane
Technologists Proceedings, 13th
3. Smucker, A.J.M. and R.H. Leep. 1975. Influence of peroxide and polyelectrolyte treatments on germination, seedling, emergence and yield. Proc. Association of Official Seed Analysts 65:147-153.
Smucker, A.J.M. and R.E. Lucas. 1975. Development of the Castelar graduate soil science program in
5. Smucker, A.J.M. and A.E. Erickson. 1976. An aseptic mist chamber system: A method for measuring root processes of peas. Agron. J. 68:59-62.
Schumacher, T.E. and A.J.M. Smucker. 1978. Influence of mechanical
impedance upon the morphology, growth, and O2 uptake by Phaseolus vulgaris
roots. Reports for Commission Papers, Vol. 1., pp.
97-98. 11th Congress of International Society of
7. Smucker, A.J.M., B.D. Knezek and G.R. Hooper. 1979. Influence of short-term oxygen stress upon the translocation of zinc in navy beans (Phaseolus vulgaris L.). In: The Root_Soil Interface. J.L. Harley and R. Scott Russell, eds. Academic Press. p. 434.
8. Pessoa da Costa, G.T. and A.J.M. Smucker. 1981. Interactions of oxygen-nitrogen-salinity stresses on plant growth and mineral content of sunflower (Helianthus annuus L.) in sand culture. J. of Plant Nutrition 3(6):887-903.
9. Schumacher, T.E. and A.J.M. Smucker. 1981. Mechanical impedance effects on oxygen uptake and porosity of drybean roots. Agron. J. 73:51-55.
10. Smucker, A.J.M., S.L. McBurney and A.K. Srivastava. 1982. Quantitative separation of roots from compacted soil profiles by the hydropneumatic elutriation system. Agron. J. 74:500-503.
11. Srivastava, A.K., A.J.M. Smucker and S.L. McBurney. 1982. An improved mechanical soil-root sampler. Transactions of the ASAE, Vol. 25, No. 4, pp. 868-871.
12. Schumacher, T.E. and A.J.M. Smucker. 1983. Measurement of CO2 dissolved in aqueous solutions using a modified infrared gas analyzer system. Plant Physiol. 72:212-214.
13. Schumacher, T.E., A.J.M. Smucker, A. Eshel and R.B. Curry. 1983. Measurement of short-term root growth by prestaining with neutral red. Crop Science 23:1212-1214.
14. Ghaderi, A., A.J.M. Smucker and M.W. Adams. 1984. Expected correlated responses in selecting dry beans for tolerance to soil compaction. Euphytica 33:377-385.
15. Schumacher, T.E. and A.J.M. Smucker. 1984. Effect of localized anoxia on Phaseolus vulgaris L. root growth. J. Experimental Botany 35(156):1039-1047.
A.J.M. 1984. Carbon utilization and losses by plant root systems. In:
Roots, Nutrient and Water Influx, and Plant Growth. Barber and Boulden, eds. Amer. Soc. Agron.,
17. Asady, G.H., A.J.M. Smucker and M.W. Adams. 1985. Seedling test for the quantitative measurement of root tolerances to compacted soil. Crop Science 25:802-806.
18. Mulligan, M.F., A.J.M. Smucker and G.F. Safir. 1985. Tillage modifications of dry edible bean root colonization by VAM fungi. Agron. J. 77:140-144.
19. Schumacher, T.E. and A.J.M. Smucker. 1985. Carbon transport and root respiration of split root systems of Phaseolus vulgaris subjected to short term localized anoxia. Plant Physiology 78:359-364.
A.J.M. 1985. Soybean crop responses to soil environmental stresses.
In: World Soybean Research Conference III: Proceedings. R. Shibles, ed. Westview Press,
21. Smucker, A.J.M. and G.R. Safir. 1985. Root and soil microbial interactions which influence the availability of photoassimilate carbon to the rhizosphere. In: Microfloral and Faunal. M.J. Mitchell, ed. pp. 203-244.
R.R., J.M. Kraft and A.J.M. Smucker. 1986. Soil compaction and crop
residue management effects on root diseases of annual food legumes. International Food Legume Research Conference,
A.J.M., J.C. Ferguson and J.T. Ritchie. 1986. Visualization of the
rhizospheres of intensively cultivated soils. XIIIth Congress of the
Int'l. Soc. of Soil Sci.,
24. Schumacher, T.E. and A.J.M. Smucker. 1987. Ion uptake and respiration of dry bean roots subjected to localized anoxia. Plant and Soil 99:411-422.
25. Smucker, A.J.M. and A.E. Erickson. 1987. Anaerobic stimulation of root exudates and disease of peas. Plant and Soil 99:423-433.
A.J.M., J.C. Ferguson, W.P. DeBruyn, R.K. Belford
and J.T. Ritchie. 1987. Image analysis of video-recorded plant root systems.
In: Minirhizotron Observation Tubes: Methods and Applications for
Measuring Rhizosphere Dynamics.
27. Hasenstein, K.H., M.L. Evans, C.L. Stinemetz, R. Moore, W.M. Fondren, E.C. Koon, M.A. Higby and A.J.M. Smucker. 1988. Comparative effectiveness of metal ions in inducing curvature of primary roots of Zea mays. Plant Physiology 86:885-889.
28. *Smucker, A.J.M. 1988. Video recording and image analyses of the rhizosphere. Yearbook of Science and Technology. McGraw-Hill. 3 pp.
29. Asady, G.H. and A.J.M. Smucker. 1989. Compaction and root modifications of soil aeration. Soil Science Soc. Amer. J. 53(1):251-254.
30. Box, J.E., Jr., A.J.M. Smucker and J.T. Ritchie. 1989. Minirhizotron installation techniques for investigating root responses to drought and oxygen stresses. Soil Sci. Soc. Amer. J. 53(1):115-118.
32. Smucker, A.J.M. and A.E. Erickson. 1989. Tillage and compactive modifications of gaseous flow and soil aeration. In: Mechanics and related processes in structured agricultural soils. W.E. Larson et al., eds. Kluwer Academic Publishers, pp. 205-221.
33. Schroeder Murphy, S.L., B. Huang, R.L. King and A.J.M. Smucker. 1990. Measurement of whole plant responses to compacted and flooded soil environments in the teaching laboratory. J. Agron. Ed. 19(2):171-175.
34. Smucker, A.J.M. 1990. Quantification of root dynamics in agroecological systems. In: Instrumentation for Studying Vegetation Canopies for Remote Sensing in Optical and Thermal Infrared Regions, Remote Sensing Reviews. V.S. Goel and J.M. Norman, eds. 5(1):237-248.
35. Snider, R.J., R. Snider and A.J.M. Smucker. 1990. Collembolan populations and root dynamics in Michigan Agroecosystems. In: J.E. Box and L.C. Hammond, eds. Rhizosphere Dynamics. AAAS Selected Symposium 113, pp. 168-191.
36. Smucker, A.J.M., A. Nunez-Barrios and J.T. Ritchie. 1991. Root dynamics in drying soil environments. Belowground Ecology, Spring, pp. 4-5.
37. Smucker, A.J.M., A.K. Srivastava, M.W. Adams and B.D. Knezek. 1991. Secondary tillage and traffic compaction modifications of the growth and production of dry edible beans and soybeans. Amer. Soc. of Ag. Engineers 7(2):149-152.
38. Huang, C.,
A.K. Jain, G.C. Stockman and A.J.M. Smucker. 1992. Automatic image
analysis of plant root structures.
Proceedings of the 11th IAPR Conference on
Pattern Recognition Methodology and Systems.
39. Huang, Q., A.K. Jain, G.C. Stockman and A.J.M. Smucker. 1992. A new perspective on segmentation: Token-based grouping at multiple levels. Image Processing: Theory and Applications on Segmentation, pp. 1-9.
40. Majdi, H., A.J.M. Smucker and H. Persson. 1992. A comparison between minirhizotron and monolith sampling methods for measuring root growth of maize (Zea mays L.). Plant and Soil 147:127-134.
42. Smucker, A.J.M. 1992. Contemporary analytical methods for quantifying plant root dynamics. L. Kutschera et al., eds. Root Ecology and its Practical Application. Verein fur Wurzelforschung, Vienna. pp. 721-726.
43. Smucker, A.J.M. and R.M. Aiken. 1992. Dynamic root responses to water deficits. Soil Science 154(4):281-289.
44. Taylor, H.M., Y. Waisel, A.J.M. Smucker and R.W. Zobel. 1992. Study of roots and their functions in plants. J. Plant Nutrition 15:6-7.
45. Smucker, A.J.M. 1993. Soil environmental modifications of root dynamics and measurement. Annual Rev. Phytopathol. 31:191-216.
A.J.M. and R.R. Allmaras. 1993. Whole plant responses to soil compaction.
47. Smucker, A.J.M. and J.T. Ritchie. 1993. Plant physiological responses to the soil Ė Discussion. In: Intíl. Crop Science I, D.R. Buxton, et al. (eds.), Amer. Soc. Agron./Crop Science Soc. of Amer., Madison, WI. pp. 747-748.
A.J.M. and J.T. Ritchie. 1993. Plant physiological responses to the soil Ė
In: Proc. of the
First Intíl. Crop Sci. Cong. D.R. Buxton (ed.),
49. Murphy, J.A., M.G. Hendricks, P.E. Rieke, A.J.M. Smucker and B.E. Branham. 1994. Turfgrass root systems evaluated using the minirhizotron and video recording methods. Agron. J. 86(2):247-250.
50. Murphy, S.L. and A.J.M. Smucker. 1995. Evaluation of video image analysis and line intercept methods for measuring root systems of alfalfa and ryegrass. Agron. J. 87(5):865-868.
51. Pietola, L.M. and A.J.M. Smucker. 1995. Fine root dynamics of alfalfa after multiple cuttings and during a late invasion by weeds. Agron. J. 87(6):1161-1169.
52. Smucker, A.J.M., B.G. Ellis and B.T. Kang. 1995. Alley cropping on an alfisol in the forest savanna transition zone: Root, nutrient, and water dynamics. Agroforestry, pp. 103-121.
A.J.M., W. Richner and V.O. Snow. 1995. Bypass flow via root-induced macropores (RIMS) in
subirrigated agriculture. Clean
Water Clean Environment for the 21st Century, Conf. Proc., Vol. III:
Practices, Systems, and Adoption.
54. Aiken, R.M. and A.J.M. Smucker. 1996. Root system regulation of whole plant growth. Annu. Rev. Phytopathol. 34:325-346.
57. Asseng, S., J.T. Ritchie, A.J.M. Smucker and M.J. Robertson. 1998. Root growth and water uptake during water deficit and recovering in wheat. Plant and Soil 201:265-273.
58. Dowdy, R.H., A.J.M. Smucker, M.S. Dolan and J.C. Ferguson. 1998. Automated image analyses for separating plant roots from soil debris elutriated from soil cores. Plant and Soil 200:91-94.
59. Kemner, K.M., W. Yun, Z. Cai, B. Lai, H.-R. Lee, D.G. Legnini, W. Rodrigues, J. Jastrow,
R.M. Miller, S.T. Pratt, M.A. Schneegurt, C.F. Kulpa, Jr. and A.J.M. Smucker. 1998. Using x-ray
microprobes for environmental research. Proceedings ĖThe
Intíl. Soc. for Optical
60. Ostrom, N.E., K.E. Knoke, L.O. Hedin, G.P. Robertson and A.J.M. Smucker. 1998. Temporal trends in nitrogen isotope values of nitrate leaching from an agricultural soil. Chem. Geol. 146:219-227.
61. Pietola, L. and A.J.M. Smucker. 1998. Fibrous carrot root responses to irrigation and compaction of sandy and organic soils. Plant and Soil 200:95-105.
64. Akinnifesi, F.K., A.J.M. Smucker and B.T. Kang. 1999. Below-ground dynamics in agroforestry systems. Annals of Arid Zone 38(3&4):239-273.
65. Fahey, T.J,
C.S. Bledsoe, F.P. Day, R.W. Reuss and A.J.M.
Smucker. 1999. Fine root production and demography. In: Standard Soil Methods for Long Term
Ecological Research. G.P. Robertson
et al., eds.
66. Rasse, D.P. and A.J.M. Smucker. 1999. Tillage effects on soil nitrogen and plant biomass in a corn-alfalfa rotation. J. Environ. Qual. 28(3):873-880.
67. Rasse, D.P., A.J.M. Smucker and O. Schabenberger. 1999. Modifications of soil nitrogen pools in response to alfalfa root systems and shoot mulch. Agron. J. 91(3):471-477.
68. Albee, P.B., G.C. Stockman, and A.J.M. Smucker.
2000. Extraction of pores from microtomographic reconstructions of intact soil
69. Collins, H.P., E.T. Elliott, K. Paustian, L.G. Bundy, W.A. Dick, D.R. Huggins, A.J.M. Smucker and E.A. Paul. 2000. Soil carbon pools and fluxes in long-term corn belt agroecosystems. Soil Biol. and Biochem. 32:157-168.
70. Erickson, A.J., R.S. Ramsewak, A.J. M. Smucker and M.G. Nair. 2000. Nitrification inhibitors from the roots of Leucaena leucocephala. J. Agric. Food Chem. 48:6174-6177.
71. Rasse, D.P., J.T. Ritchie, W.R. Peterson, J. Wei and A.J.M. Smucker. 2000. Rye cover crop and nitrogen fertilization effects on nitrate leaching in inbred maize fields. J. Environ. Qual. 29(1):298-304.
72. Rasse, D.P., A.J.M. Smucker and D. Santos. 2000. Alfalfa root and shoot mulching effects on soil hydraulic properties and aggregation. Soil Science Soc. of Amer. J. 64(2):725-731.
73. Dell, C., Y. Kavdir and A.J.M. Smucker. 2001.
Management modifications of concentric gradients within soil aggregates.
A.J.M. 2001. New approaches for soil
aggregation research during the next century (Invited Keynote Address).
75. Atwell, B.J., I.R.P. Fillery, K.J. McInnes and A.J.M. Smucker. 2002. The fate of carbon and fertiliser nitrogen when dryland wheat is grown in monoliths of duplex soil. Plant and Soil 241:259-269.
76. Kavdir, Y. and A.J.M. Smucker. 2002. Soil
aggregate sequestration of cover crop root and shoot residue nitrogen.
International Conference on Sustainable Land Use and Management.
A.J.M. and Y. Kavdir. 2002. Biophysical
infrastructures that promote carbon sequestration within soil aggregates.
International Conference on Sustainable Land Use and Management.
A.J.M., Y. Kavdir, C.J. Dell and D.P.
Rasse. 2002. Plant carbon and nitrogen contributions to the formation and
function of soil aggregation processes in sustainable agroecosystems. Innovative
Soil-Plant Systems for Sustainable Agricultural Practices, Organisation for Economic Co-Operation and Development
A.J.M., C.J. Dell and D.
A.J.M. 2003. Root carbon contributions
to soil aggregate formation and function. Jun Abe (Ed.), Roots: The Dynamic
Interface between Plants and the Earth. Pp. 421-426. Kluwer Academic Publishers,
81. Kavdir, Y and A.J.M. Smucker. 2004. Comparison of
root image processing programs for quantifying plant root parameters. In: Natural Resource Management for
Sustainable Development. Proceedings of the International Soil Congress, June
82. Park, E.J. and A.J.M. Smucker. 2005. Saturated hydraulic conductivity and porosity within macroaggregates modified by tillage. Soil Sci. Soc. Amer. J. 69:38-45.
83. Horn, R. and A.J.M. Smucker. 2005. Structure formation and its consequences for gas and water transport in unsaturated arable and forest soils. Soil Tillage Res. 82:5-14.
84. Park, E.J. and A.J.M. Smucker. 2005. Soil polar tensile strength and surface erosivities of soil aggregates from conventional and no-till agroecosystems. Soil Sci. Soc. Amer. J. (in press).
85. Kavdir, Y., D.P. Rasse,
A.J.M. Smucker. 2005. Specific contributions of decaying alfalfa roots
to nitrate leaching in a
86. Blackwood, C.B., C.J. Dell, E.A. Paul, A.J.M. Smucker. 200_. Eubacterial community response to position within soil macroaggregates and soil management. Soil Biol. Biochem. (submitted).
87. Kavdir, Y. and A.J.M. Smucker. 2005. Soil aggregate sequestration of cover crop root and shoot derived soil nitrogen. Plant and Soil 272:263-276.
88. Pietola, L. and A.J.M. Smucker. 200_. Elimination of non-root residue by image analysis of very fine roots. European J. Agron. (submitted).
89. Sissoko, F., A.J.M. Smucker and E.A. Paul. 200_. Simulated root and root exudates enhancements of soil aggregates during wetting and drying. Soil Biology and Biochem. (submitted).
91. Peng, X., R. Horn, S. Peth, A.J.M. Smucker. 200_. Quantification of soil shrinkage in 2D by digital image processing of soil surfaces. Catena. (submitted)