fox farms and the like promote this hybrid soil/hydro methodology that confuses the shit out of 99% of new growers. If you grow with soil, you shouldn't need hydroponic nutrients. As someone else mentioned. top dressing with more of the soil is ALL you need.
the fact that they sell you overpriced soil, and then sell you bottled nutrients, and then say oh but you don't need fertilizers cause the soil is good for the first few weeks, then give you a feed chart that says to feed 10 different things in week 1.
It's borderline a scam. But if you insist on using Fox farms products the soil is all you need. Start with 3 gallons of soil in a 5 gallon pot with the sides folded down and then top dress a few handfuls each time you water.
New growers: choose soil or hydro. one or the other. they don't mix well.