The dry mass content (% of dissolved substances in the extract) was determined for the most efficient extracts and for the highest tested dose (50 g/l) as follows: 10 g of the extract were removed before its application and all water was evaporated in a dryer at 150°C. The weight of the non-evaporated substances was used to calculate the dry mass content, expressed in % (w/w). The determination was performed 3 times.