Kathy wrote:
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?

N is nitrogen, P is phosphorus, K is potassium. The numbers are
percentages. So if you see 30-10-10 on a bag of fertilizer you know
that it will deliver 30 percent nitrogen, etc., with the remaining 50
percent being filler/carrier and maybe trace elements. -aem