Healthy soil and sustainable growing

[Daniel Jenkins <medaniel@direcway.com>]

Hi there,  I am a new poster who is just getting back in to gardening  
after many years.  I have read several books now on permaculture and  
this is the direction I want to go, but I have only read, not been  
able to talk with anyone or see their gardens.  I am hoping I can  
find someone in my area (Georgetown divide in California) who is  
knowledgeable and can take me under their wing!  For now, I have the  
following question:  If my garden area is on a hillside, and I plant  
black locust trees or other nitrogen fixers above the garden area,  
will the nitrogen they "produce" be able to "run" downhill to the  
garden area?  Thank you all for any help you can give, Terry Jenkins