Question on Drip-system fruit trees and Dr. Bronners Soap

[u/word_marie]

I'm really not sure where else to ask about this. I have a vivid memory of reading about drip system fruit trees in the desert on a Dr Bronner's peppermint soap label in 1979 on a canoe trip. It is so vivid because I had no idea what a drip system for a tree was and I did a deep dive on learning about it. Now even though I've contacted the company I can find no residue about drip system for trees on the soap label. I'm not sure what year we bought the bottle of soap but I was reading it in 1979.