Aha! So the numbers must refer to something. So in a 2-3-4, that's two
somethings of nitrogen per some standard measure. Do you know what the
units are?

If I have 2-3-4 liquid and 2-3-4 powder, are they the same per cup or
the same per pound (assuming that weight and volume don't necessarly
match)? Are they the same only after being mixed according to
instructions ("1 cup per gallon of water" or some such) or ar they the
same as-is from the purchased container?

Kathy