That is interesting.

 I've also been wanting to do a couple root pits, but never seen to get that done either. Now, I may have to just make the time. I kinda think our rainfall time period, more so than the amount, has something to do with the acids forming so quick. 

 I would be very interested to see the multi-level sample results from your soils when you take them. You typically have one legume every three years or so in your rotation, or....?

 Thanks for the added information. Learning new things every day.