I’m using @GreenleafNutrients Megacrop atm It’s emphasis seems to be the roots. Good strategy it seems from some of the threads here. They are also providing some additives for flowering and as an enhancer but this product is meant to be good enough to run alone from seed to harvest.
My understanding is that it is the 3rd formulation currently so the package pictured ratio of 9/6/17 is to be taken with a grain of salt.
There is another thread on it here