I bought 3 lbs of soluble kelp concentrate for $35 from Concentrates, inc. 1-1-17.
Humic acid powder for $10/lb
Floralicious plus is 20% ascophyllum nodosum kelp
So you would use .2 mls/gallon of kelp to duplicate those values.
I would drop it a little further, some is lost in translation from liquid kelp measurements to dry.