Brother, I wonder why no one caught this....
Why bother adding B/F when you can BUY organic soil all ready to grow in, complete with all the B/F you want/need.
Potter's Gold
Dr. Earth's POTting soil
google complete amended organic potting soil for more.....
I used to make my own "super soil" but age and ache's along with time have me buying Potters Gold and I could not be happier with it!
I don't care what fert you use, that's your choice. BUT, I would, at least weekly. Use a nice AACT tea to help the plant use what may be lurking in the soil left from synthetics use. This will also resupply the B's and the F's to your soil that the synth will have begun to kill off, and feed any that remain.......Applying a synthetic to amended soil will not "kill" the Bio's on contact, it takes time and repeated applications to fully "kill" them off.
As far as salts go, any synthetic with the N based in UREA will be "salty"....There are synthetic makers out there that do not use urea as it's base for N. those are much more pure and don't "clog up" the soil, turning it into a "brick" anywhere near as fast as the urea! Canna and hesi come to mind.....I find Hesi to be the cleanest running synth I have used.
Search AACT here on this site for the hows to make it.....use it!
Ok more, The nutrients supplied in a good premade amended potting soil will last about 30 days before needing to be amended (adding organic nutrition back to the soil). depending on what and how this is done, it can last another 30 days.
"anything will help" - READ THIS
Teaming with Microbes The Organic Gardener's Guide to the Soil Food Web.
Get it here
http://www.amazon.com/Teaming-Microbes-Organic-Gardeners-Revised/dp/1604691131
It's worth the price! You will learn what you ask for on an easy to understand level!