Dezember 2016 - September
2017
Dr. L.D.B. Suriyagoda
Department of Crop Science
Faculty of Agriculture University of Peradeniya
Peradeniya, 20400
Sri Lanka
Juli-September
2002:
Prof. Dr. S. P. Trehan Central Potato Research Station
Model Town
Jalandhar
Punjab, India
Juni-August
2000,
Juni 2001,
September 2002:
Prof. Dr. Upkar S. Sadana Department of Soils Punjab
Agricultural University
Ludhiana - 141004
Punjab, India
Juni 2000:
Jarosław Pobereżny, Mgr inż.
University of Technology and Agriculture
Department of Storage of Agric. and Food Products
ul. Ks. A. Kordeckiego 20
85-255 Bydgoszcz
Poland