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.