North American Fruit Explorers mailing list at ibiblio

[Jason MacArthur <rotread@localnet.com>]

I have a question for which a concrete answer will be impossible, but I 
am hoping to get a vague answer gleaned from the collective NAFEX 
wisdom.  I am planting some apple trees into a field with heavy clay 
soil, and I am wondering how much irrigation will be involved.  The 
trees  are mostly on M9, with some Bud9 and some G16 rootstocks.  As a 
general rule, how much watering do they need?