Originally Posted by Zapins
At minimum you need KNO3, KH2PO4, and CSM+B.
I highly recommend K2SO4 as well.
DTPA iron is nice to have, and so are CaCl2 and MgSO4 but the first 3 ferts mentioned above will have everything you need in them.
I usually buy from:
What about that macro micro kit it looks like everything you listed?