Authors
Jan Krężel
Department of Horticulture, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
Eugeniusz Kołota
Department of Horticulture, Wrocław University of Environmental and Life Sciences, Wrocław, Poland
© 2012 Jan Krężel, Eugeniusz Kołota, published by Polish Society for Horticultural Sciences (PSHS)
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.