Guess it all depends....back in the day we used to re-use Sunshine mix, just adding bone, blood, and lime to re-condition the soil, then add fert tea, etc. Things were fine and yeilds were decent. These days the younger guys are using 1 pallet (60 bags) of soil PER plant....either in the ground or in 100 gallon pots. Additions are now along the lines of Kelp, Bone, Blood, Feather, Fish/Crab Meal, Rock Dust, Diatomaceous, Lonfosco, Worm Castings, They are growing TREES these days and getting 4-6lb organic and up to 12lb with chem. I've seen friends plots on Google Earth they are so big...and these are CA licensed grows. Both work....just depends on what scale you wanna go. ;-)

Aloha