INFLUENCE OF SOLUBLE HUMIC SUBSTANCES ON THE GROWTH OF ALGAE AND BLUE-GREEN-ALGAE

A stimulatory effect of soluble humic acid and sodium humate of soft c oal origin on the growth of green alga Chlorella and Scenedesmus was e stablished. On the contrary, the growth of blue-green algae was not af fected by humic substances. For green microorganisms soluble humic sub stances act more as a fertilizer than a bacteriostatic substance. The possibility of application of soluble humic substances as selective fe rtilizer of algae at the expense of blue-green algae at concentrations up to 300 mg/L is discussed.