Sure in my blood, that's positive.

My Extension friend Bob Sutton had a ten week soils course by newsletter 30 years ago. I might still have it. We read a chapter a week and discussed it. It was very helpful to me.

Hands on Agronomy by Neal Kinsey would be a good place for you to start. Easy Reading.

Really recommend Jeff Littrell or Foliardud(e)s Fertility Manual, I don't think anyone on here would disagree much. Very readable and very practical today.

https://www.google.com/#q=fhr+fertility+manual

Ed Winkle