"a yellow to yellow-brown humic substance that is soluble in water under all pH conditions; \"they measured the fluvial fulvic acid\""@en-us . . "fulvic acid"^^ . "0"^^ . "114875878"^^ . . "114028421"@en-us . . . . . "fulvic acid"@en-us . "0"^^ . . . . "14875878-n"^^ .