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HUMIC SUBSTANCES CHARACTERISTICS OF THE MIXED PLANTATION OF POPLAR AND BLACK LOCUST IN SANDY SOIL Effect of Bio-active Humic Substance on the Biomass of Glycyrrhiza uralensis,Soil Humus Composition and Enzymatic Activities EFFECTS OF COPPER AND FULVIC ACID ON THE GROWTH OF GREEN ALGAE Component of Soil Humic Substances in Larch Plantations and Its Effects on Soil Acidity