According to the Soil wiki, bananas generally prefer a pH of 5.5 - 7.5 (mildly acidic to neutral).
http://www.bananas.org/wiki/Info:Soil
I don't see anything mentioned about calcium on that page of the Fertilizer page, though. Hopefully someone can shed light about the calcium needs for bananas?
http://www.bananas.org/wiki/Info:Fertilizer
Laurence