Are dose it come down if i want to have my soil feed my plants. Are do it my self by adding nutrients.
That's it.
However I know that some soils aren't perfectly balanced for growing MJ and needed to be supplemented in order to sustain healthy growth. For example Roots Organic is a really good product but you need to add Cal/Mag to grow the best crop.
Check out what is in the products you use. Those soils are extremely nutritious for the most part. However the gospel thing to do these days is to fert the hell out of your crop in order to get the most yield.
Go to the organics section of the forum and check out Subcools Super Soil recipe. Maybe it'll help ya understand why some shit works and some worm shit works better.