Thanks bro, I appreciate that great info! Good to know.About those fields of corn and stuff, those fields are soil, dirt, it's in the ground. Soil buffers the pH. As far as dispensaries, if they are growing hydro they probably have a resivour that contain nutes for a group of plants and when they mix the nutes they pH at the same time. There are controlled units available that electronically monitor pH, ppm, and EC and adjust as needed. Most big grow ops don't use a 16 bottle nute system. They do the same thing I do, grow plants by feeding them what they need to grow with a simple nute program designed to cover all the needs of a plant, no matter what that plant is.
Don't think weed is some sort of special plant that needs all sorts of special shit to survive, it's not. It's a plant just like any other. These "canabis specific" nutes and shit are only a money making marketing game.
If you ever want to read a book about growing weed just get a book on gardening. A plant is a plant. If you grow hydroponically get a book on hydroponic gardening. If you grow in soil get a book in soil growing. Most canabis stuff is just hype, don't be fooled. If it will grow tomatoes, it will grow weed.
So since most good soils I know of are actually made of peat, coco, etc, then if one wanted to grow in actual soil, what would they do if the surrounding soil is very shity/clay like? Are any good store bought soils actually soil? Googling now lol.
Also out of curiosity, what nutes do you use? I see a lot of people starting to use MAXSEA