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Soilless hydroponic cultivation of cucumbers (Cucumis sativus L.) has expanded rapidly during the last few decades. One of the key factors in achieving high productivity in industrial greenhouses is the choice of growing medium. Rockwool has become dominant, especially in Europe. However, in addition to energy consumption during production, landfilling of rockwool as a non-biodegradable material is expensive and poses an environmental risk. Therefore, there is increasing use of organic substrates in the soilless c...