Healthy soil and sustainable growing

[Marty Kraft <martyk@allspecies.org>]

Does anyone know of any graphs or other data showing the rate of  
carbon loss after tilling? After i till a bed how quickly should it  
be covered by mulch to prevent carbon loss? I am practicing no-till  
gardening and i just dug two beds of sweet potatoes which is a lot  
like tilling. It's raining and i haven't mulched yet. I'll cover the  
soil when i can but this is a question that often arises. Does anyone  
know of a rule of thumb for this question?

Marty Kraft, Kansas City