Good information from Harley. but holy crap RAW's products are crazy expensive. If you start mixing your own from salts you can get the goods a ton cheaper. I've simplified a lot and more follow Dr. Bugbee. You may find his presentations of interest. He calls for a 2-1-2 all through the growth cycle.
Thanks, but I won't be buying raws salts, I just meant in terms of mixing my own nutrients up. Of course you can get the same stuff from elsewhere too much cheaper