i can try.. here it goes.. i have baked a lot of things in my life.. rocks,wood ..but never soil so i don't know if that is true.. but if you want to breed crickets the thing to do is use either regular soil.. i wouldn't recommend the soil from you back year because who know what kind of chemicals is in it ..or potting soil .. you can either make a seperate cage or make like a humid hide out of a gladware container.. fill it up with damp soil and in about two weeks you should have little babie crickets popping out of the soil.. if you want to make a seperate container place damp soil and food in that container and about 10 adult crickets after about a week take the crickets out and wait for the babies to pop out.. hope that helps if not here is a list of websites that could help
don't make the whole cage out of dirt they are messy and mix dirt in with their food.. becomes like an icky mush..
1.www.iosphere.net/~ajs/breeding.htm
2.www.icomm.ca/dragon/crickets.htm
3.www.arbreptiles.com/bugs/crix.html
4.www.herpindex.com/center/cricbred.html
hope that helps.. 
alissa