Naše vode, problemi onesnaževanja, načini zaščite in recikliranja. Vodni tokovi na obdelovalnih površinah. Pregled in nadzor vode. Stopnje čistosti vode. Onesnaženje vode, odpadne vode, evtrofikacija, zakisljevanje, biocidi. Metode čiščenja in zaščite. – Atlas 42 prosojnic s 114 slikami

Opis

Our Waters, Problems of Pollution, Methods of Protection and Recycling. Water courses in cultivated areas. Examination and supervision of the water. Levels of water purity. Water pollution, sewage water, eutrophication, acidification, biocides. Methods for cleaning and protection. – Atlas of 42 transparencies with 114 pictures