Hey gang,

I am not a chemist, but this is an Ag term.

If you would please, could some one forward this to Ingrid, since she has
had me blocked for years now, and we don't speak directly, but the term
NO3-N is a new way designating the relationship of the amounts of nitrogen
applied to fields and the resultant NO3 that remains after the crop has been
harvested. Ag people in numerous states in the heartland have been working
on this for years now, but it is a way of watching and calibrating the the
amounts of N fertilizer needed for the next crop to prevent the buildup of
nitrates and keep them out of the water table amd out of run off.. It is
measured in the 6 inch to one foot levels of the soil all the way to the 3
foot depth of the soil. Nitrates are still measured in ppm, and the N is
measure in pounds/acre. Charts are kept to show the coorelations and show
the amounts needed for a variety of crops.

HTH

Tom L.L.
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"Killinchy" wrote in message
news:3yyod.313864$%k.20244@pd7tw2no...

"Derek Broughton" wrote in message
...
wrote:

a chemist on this list? I done all the searches and have come up with
the
standard "total nitrogen" thing, now I want it explained in more detail
and WHY they use this way of expressing it when they werent doing that
20
years ago when I took the damn

Who's "they"? When I've seen NO3-N, I thought it was just an indicator
of
the Nitrate - Nitrogen pathway, not a molecular notation.
--
derek
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You're right, Derek. NO3-N is new to me