Abstract
Biologioal activities of humic acid (Na salt), hymatomelanic acid (Na salt), lignofulvic acid and of fulvic acids isolated from peat were studied by means of the auxin-, gibberellin-, and cytokinin- bioassays. All the four tested fractions showed higher or lower stimulating activity in these bioassays. However, the stimulating effect is considerably lower and cannot be interpreted as phytohormone activity. Some fractions in some concentrations also showed inhibitory effects. The manner of biological action of the studied fractions might bo the result of interaction of their respective components.
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