Hydrated lime for soluble calcium


I have been reading Gary F. Zimmer book “the Biological Farmer” He discusses how very little calcium in lime is available to the plant. He suggests using hydrated lime and sulfur for some of the needed calcium. Is there any suggested maximum or minimum application rates? What kind of sulfur should I add with it? Do you have any other suggestions on Calcium. How does gypsum rate in availability to the plant?