Justin a écrit :
hi all,

I just wanted to ask a question if I could. I have mentioned before
that I can only find KNO3 in 25Kg bags but when I was up purchasing my
trace element mix for my PMDD I found Sulphate of Ammonia... When i had
a look at the chemicals on the back, it has 21% Ammonium as Nitrogen and
23% Sulphate I have done some research on the net and a chemical website
says that it's 21% Nitrogen and 23% Sulphate as opposed to KNO3, which
is 13% Potassium and 44% K2O (which I gather is 2 Potassium molecules
bound to an oxygen molecule??)... Can I use this as my Nitrogen
source? It's in a 2kg bag and would be easier than purchasing a 25Kg
bag... I have read somewhere that Ammonium is the preferred source of
Nitrogen for plants, so i'm thinking I should be safe...

Also, my trace element composition is a bit different from the one
listed on the krib, mainly the Fe is 1% lower... Does anyone think I
should compensate for this by putting in some Chelated Iron (which I
pick up from the local Kmart - a cheaper department store for
non-aussies) for $4.00...?

Thanks for any feedback.

Justin.
If I were you, I'd try a drugstore for you KNO3. They name it Salpeter
and sell 250g bottles of it for about 3-4 dollars (that would be in the
first aid section imho)