Just to clear up, the scientist type tinkering with his craft does not mean buying the cheapest bag of soil and trying his luck, that's just being lazy and calling it an experiment as an excuse. We don't pick apples from the citrus tree the exact same way we don't use azalea and hydrangea care products on cannabis plants. No "new frontier" information is going to come from someone buying already composed soil or products, as we all know each plant species demand their own specific kinda growing media, even within one genus like cannabis slight changes is needed. a tinkering scientist will be making his own soil, cause they're usually aware of the horrors of buying, well basically anything from the commercial nursery. experiment doesn't mean hitting google with a quick search and running to the commercial nursery for the cheapest product with that stuff in it. that's being lazy and wanting the quick fix. the more experienced you become as a grower the less time you spend running back and forth to the nursery or any grow shop for that matter. that's why we see the whole industry shift to biological control, living inputs. most nutrients your plants need is already in your kitchen and in the yard around your house