Green roofs are one of the method of recovering green space in urban are-as. They are also effective in improvement of air quality and local climate as well as play an important role in thermal insulation of buildings. The most important role they play in urban areas is rain water retention and delaying of the runoff. The main goal of the research was to estimate potential influence of the green roof substrate on runoff water quality. Preliminary results show increase of the con-centration of phosphates and total solids in leachate. Mean concentration of solids in intensive roof substrate leachate amounted 231 mg dm-3 and in extensive sub-strate leachate 274 mg dm-3, comparing to concentration 6-7 mg dm-3 in simulated rain. Phosphorus concentration in intensive and extensive substrate runoff amounted 0,112 mgPO4-P dm-3 and 0,126 mgPO4-P dm-3 respectively. Phosphorus concentration in simulated rain amounted 0,056 mgPO4-P dm-3. Even if the concentrations in substrate leachate are low, phosphorus can still be an important factor influencing green roofs runoff receiver quality. ...
Utilisation of plants or their parts for detection of Phytophthora from soil and water was the interesting object in the second part of XX century. Using of fruits, seedlings, seeds of different plant species gave possibility to detect the most dangerous pathogens. In this study the effectiveness of rhododendron leaves as the bait for detection of Phytophthora, Cylindrocladium scoparium, formae spec. of Fusarium oxysporum and Rhizoctonia solani from water and horticultural substrate was estimated. During the detection of Phytophthora from river, canal and water container rhododendron top leaves were placed on the surface of water and after 4-5 days number of necrotic spots/leaf was estimated. Parts of necrotic spots were transplanted on PDA medium for isolation and identification of species. In the detection of other species from substrate, rhododendron leaves were placed in the water suspension of soil and after 3-5 day-incubation number of necrotic spots /leaf was calculated. The necrotic spot parts were transferred on PDA medium for isolation and identification of fungal species. Results obtained indicated on rhododendron leaves as satisfactory bait for detection of the most dangerous pathogens from water and soil. The method is easy for application and may be used for all year ...
