From: "Nemo"
Terrestrial Plant Fertilizers for Aquarium

I gather an N-P-K ratio of 10-1-20 or 10-1-10 is desired in a planted
aquarium. Most Terrestrial Plant Fertilizers have way too much phosphate.
But how about the ones that don't like these two by Schultz (see links
below). Would they be safe to use in a planted tank?

Thanks

http://www.schultz.com/irongreen.htm
http://www.schultz.com/lawnprod.htm

The problem with most lawn and terrestrial ferts is that the Nitrogen is mostly
offered in the for of urea or ammoniacal nitrogen which can be absorbed through
the leaves of terrestrial plants. Unfortunately, for aquatic purposes, this
would spike ammonia levels to possibly toxic levels and kill your fish or, at
the very least, cause an algae bloom.



Nick Wise
http://members.aol.com/nwwise01