Ph.D. University of Minnesota 1988
M.S. University of Idaho 1984

• Office Phone:(605) 688-5081
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 214
  Brookings, SD 57007
  E-mail: DAVID_CLAY@SDSTATE.EDU

Dr. Clay is currently conducting research into the impact of physical stress on C and N cycling, the fate of N fertilizer in soil, management techniques to reduce nitrate leaching to groundwater and improve soil quality, and the development of mechanistic models to define these systems.

Ph.D University of Minnesota 1986
M.S. University of Idaho 1982

• Office Phone:(605) 688-4757
  Office Fax: (605) 688-4452
  Office Location: Northern Plains Biostress Lab 245C
  Box 2140C Room 245C
  Brookings, SD 57007
  E-mail: SHARON_CLAY@SDSTATE.EDU

The weed science program is many faceted. There are opportunities to conduct research in herbicide-soil interactions to limit herbicide contamination of off-site areas and to understand the fate of herbicides in the soil, vadose zone and aquifer. Understanding weed ecology in crop and rangeland systems is also an important component of the program. Nonchemical options for weed control including the use of crop rotation and biological control techniques also are developing as important part of the weed science program. Dr. Clay teaches the course, "Weed Science", that has a laboratory section to develop understanding of weeds, herbicides, and their fate in the environment.

Dr.C. Greg Carlson, Professor

Ph.D South Dakota State University
M.S. South Dakota State University

• Office Phone:(605) 688-4761
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 208
  Brookings, SD 57007
  E-mail: carlson.gregg@ces.sdstate.edu

Dr. Carlson has a joint appointment of teaching, research and extentsion. Dr. Carlson teaches agronomy, precision agriculture, salinity, water quality classes at SDSU. His research interests include maximizing yield through deep tillage and optimum plant population and nitrogen rates.

Zhuojing Liu, Research Associate

MS South Dakota State University 1994
BS JiangXi University Chemistry 1982

• Office Phone:(605) 688-4594, 605-688-6243
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 206
  Brookings, SD 57007
  E-mail: Zhuojing_Liu@sdstate.edu

Research interests include precision farming, agrichemical transport and dissipation, herbicides interaction with soil and plant, soil and water quality and weed management. Managing laboratory activities of the precision farming group, supervising and training lab personnel, operating and maintain all lab instruments such as isotope ratio mass spectrometer, HPLC, and GC, providing essential scientific data and information to project leaders and public.

Cheryl Reese, Research Associate

MS University of Minnesota 1995
BS University of Minnesota 1990

• Office Phone:(605) 688-6309
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 210
  Brookings, SD 57007
  E-mail: Cheryl_Reese@sdstate.edu

Cheryl Reese is responsible for supervising Precision Agriculture activities as SDSU such as organizing and conducting meetings and training sessions, working with producer learning groups and maintaining the SDSU Precision Agriculture website. She also assists with field work as needed. She is currently working on a Ph. D. Research interests include nitrogen and water interaction on grain quality.

Scott Christopherson, Research Assistant

BS South Dakota State Univeristy 1997

• Office Phone:(605) 688-5105
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 216
  Brookings, SD 57007
  E-mail: Scott_Christopherson@sdstate.edu

Scott Christopherson works as a research assistant in the Plant Science Department as South Dakota State University. He has a BS in Biology from SDSU. Scott works with several projects at SDSU such as the IR-4 project which tests herbicide residues amounts on minor use crops and measuring geographic distribution of weeds and nutrients in fields. Scott also works with Precision Agriculture activities such as collecting soil electrical conductivity data and elevation data from research project fields.d

B.S. 1996 Agricultural Business, SDSU
M.S. 2002 Agronomy, SDSU

• Office Phone:(605) 688-5105
  Office Fax: (605) 688-4602
  Office Location:Ag Hall
  Box 2207A Room 216
  Brookings, SD 57007
  E-mail: Jonathan_Kleinjan@sdstate.edu

Jonathan Kleinjan is research associate with the Precision Farming group, in the Plant Science Dept., SDSU. Jon has a Bachelor of Science degree in Agricultural Business from SDSU and has recently completed a M.S. degree in Agronomy, also at SDSU. He grew up on a farm near Bruce, SD and continues to work with the family farm operation. Projects that he is involved with include the examination of soil P concentration patterns in relation to past management, soil electrical conductivity relationships to soil parameters, and yield monitor data cleaning and standardization.