Peat Humic Substances and Earthworm Biohumus Extracts for Agricultural Applications
Gunārs Bremanis, Maris Klaviņš, Oskars Purmalis, Raitis Ziemelis, Solveiga Maļecka
Peat humification character in two ombrotrophic bogs depending on peat properties
Inese Silamiķele, Oļgerts Nikodemus, Laimdota Kalniņa, Oskars Purmalis, Māris Kļaviņš
Quality of Lake Ecosystems and its Role in the Spread of Invasive Species
Oskars Purmalis, Laura Grīnberga, Linards Kļaviņš, Māris Kļaviņš
Soil Pollution with Trace Elements in Territories of Military Grounds in Latvia
Ilga Kokorīte, Māris Kļaviņš, Jānis Šīre, Oskars Purmalis, Aija Zučika
Experimental Study of Peat Humification Indicators
Jānis Šīre, Māris Kļaviņš, Oskars Purmalis, Viesturs Melecis
Surface Activity of Humic Acids Depending on Their Origin and Humification Degree
Māris Klaviņš, Oskars Purmalis