Nigel Palmer
This guy has been around the block once or twice. He has a huge focus on Extracting nutrients from plant material. Harnessing energy from the plants to apply to other plants. Reducing the workload that plants require synthesizing nutrients. Homemade Apple Cider Vinegar, Vinegar Extractions, Plant nutrient extraction with plant material and brown sugar? KNF baby.
His book goes deep into the Regen practices that you can easily do at home, and the book is CHEAP for the information provided!
He also collects nutrient analysis from his amendments and shares them on his website for all to view found here -> Analysis of Amendments
Bernie Hunt
He has created an amazing breakdown of basics (and waaaaay more) information if you are interested in Starting / Enhancing Your Regenerative Agriculture Journey Everything from Simple Soil Structure Tests to Sub-soil compaction tests that you can perform at home! Worth a minute or hour of your time for sure!
Stephen Raisner
When listening to this guy make sure to have a notepad and pen handy because the information a depth that he goes into is amazing. Similarly to Nigel, he compiled an Open Nutrient Project that shows Nutrient content found in different parts of various plants, and is viewable to all.