permaculture

["frances and/or david" <fdnokes@hotmail.com>]

I have a question about fruiting trees such as pears and apples and wonder 
if this is the place to post it...
Have heard that we don't want plants in their area that will compete for 
nutrients, and this made sense.
The pear seems to be responding well to my efforts last fall to clear out 
the daisies, etc. in her area...
I am wondering whether there are things I can plant, such as cover crops, 
that would enrich things for the pear or apple.
(alfalfa or red clover to fix nitrogen?)
Thanks for any and all responses,
Frances