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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...

In Latvia, the pygmy water lily Nymphaea tetragona Georgii was first reported 70 years ago in Lake Dunezers by Emilija Ozolina (1951). As no herbarium was collected, this finding was challenged. In 2017, during surveys of Saxifraga hirculus in the transitional mire Jaunciems in the Ances bog and forest reserve, N. tetragona was identified (based on morphological characteristics), found in shallow, elongated cavities with a solid base as an accompanying species. However, its presence in Latvia has not yet been abso...