Arkie, I initially went with two tons per acre per expert advice. This seemed low, so later I added another two tons per acre. At the time I intended to disc it in, but my pond builder told me that wouldn't be necessary. Wish I had insisted!

Even a total of four tons per acre turned out to be insufficient, especially as it was just placed on the future pond bottom without disking. Very low alkalinity & pH forced me to lime within 15 months of filling. Now I do it every other year.

You just about can't lime & disc too much, especially when first starting. Much cheaper & more effective to do it before your pond fills!