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[EarthNSky <erthnsky AT bellsouth.net>]

Robert Walton wrote:
> Anyone ever used one? I'm concerned with what they mean by checking
> combined n-p-k ... what does "combned" mean in that context?
>
> Rob - Va


Rob, I've never used one of those, but it should be read as "combined 
nitrogen", phosphorus, and potassium (potash).
The combined means nitrates and nitrites.

You can do some searches on that for more.

B
--
"The world is my country, all mankind are my
 brethren, and to do good is my religion."
 Thomas Paine (1737 - 1809)