Department of Forage Crop Production, Institute of Soil Science and Plant Cultivation - State Research Institute in Puławy, Czartoryskich 8, 24-100 Puławy, Poland
Mieczysław Grzelak
Department of Grassland Sciences and Natural Landscape, University of Life Sciences in Poznań, Wojska Polskiego 38/42, 60-637 Poznań, Poland