1979-1980 | Dr. Takashi Ibusuki
- National Research Institute for Pollution, Japan
l989-l990 | Dr. Chandana Senaratne
- North Carolina State University, USA
1995-1996 | Dr. Deug-Soo Kim
- Kunsan National University, Republic of Korea
Fall 1997 | Dr. Ilie Fishtik
- The Academy of Sciences of Moldova, Moldova
February 1999-July 1999 | Dr. Mahmoud El-Sharkaway
- Fulbright Senior Scholar, Egypt
2002-2004 | Dr. Deug-Soo Kim
- Kunsan National University, Republic of Korea
2006-2008 | Dr. Jessica Blunden
- North Carolina State University, USA
Mr. Guillaume Grandjean
- National Institute of Agronomic Sciences, Grignon, France
2018-2019 | Dr. Shichun Zhang
- Northeast Institute of Geography and Agroecology (IGA), Chinese Academy of Sciences (CAS), China
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