The effect of humic and fulvic acids on the growth and efficiency of nitrogen fixation of Azotobacter chroococcum.
D001395:Azotobacter / Q000187:drug effects / Q000254:growth & development*; D001578:Benzopyrans / Q000494:pharmacology*; D006812:Humic Substances / Q000494:pharmacology*; D009586:Nitrogen Fixation / Q000187:drug effects*
D001578:Benzopyrans; D006812:Humic Substances