Acta horticulturae (1317), 223-230 (2021). doi:10.17660/ActaHortic.2021.1317.25 PROCEEDINGS OF THE II International Symposium on Growing Media, Soilless Cultivation, and Compost Utilization in Horticulture PROCEEDINGS OF THE II International Symposium on Growing Media, Soilless Cultivation, and Compost Utilization in HorticultureProc. II Int. Symp. on Growing Media, Soilless Cultivation, and Compost Utilization in Hort., Ghent, Belgium, 2021-08-22-2021-08-27