Studies on the growth stimulating action of humic acid on bacteria.
D001395:Azotobacter / Q000187:drug effects / Q000254:growth & development*; D006812:Humic Substances / Q000494:pharmacology*; D008722:Methods; D012231:Rhizobium / Q000187:drug effects / Q000254:growth & development*
D006812:Humic Substances