List:  cc the two corresponding authors in case they have more to add.   (And thanks to the  person supplying this lead, preferring to stay anonymous)

This is a valuable new non-fee biochar paper re water savings:  https://onlinelibrary.wiley.com/doi/10.1111/gcbb.12765

(With considerable good data in the Supplemental - reachable from here also. - no separate ID)

        There is a plug for it also at:    https://phys.org/news/2020-10-biochar-money.html

One sentence there (emphasis added) indicates the paper’s  importance:    "The study co-led by Rice biogeochemist Caroline Masiello and economist Kenneth Medlock provides formulas to help farmers estimate irrigation cost savings from increased water-holding capacity (WHC) with biochar amendment.

[RWL:  The formulas are easy enough)

Maybe others on this list can add to the number of papers they could use - now mostly in the sandy corner of their soil triangle.  They couldn’t use some other potentially useful water saving papers because those didn’t provide all the possibly important explanatory variables.

Below is one view of the data set they used (lots more numbers in the Supplemental).   Anyone able to add points in the clay area?   The authors state that biochar is known to work well there also - but no data yet.   

Ron