I live in Texas with black clay. I have had good luck in the garden with
gypsum. 2 applications , each spring. Little pricey at Home depot 6-7$ a
bag. I don't remember the sq ft coverage.4 to 6 hundred??? It will burn like
Fertilizer but I like the results in the garden and a new 8x45 flower bed I
put in this year.

Wrots a wruck with Clay

Tom P