While looking for information as to how to heal the alkaline, overgrazed, drought frequented, organic matter deficient, heavy clay soil on our homestead land, I found this interesting article on using chipped twig wood (smaller than 2.75" in diameter) from deciduous trees to help start dormant or missing processes. Here is the link:
http://www.thesoilguy.com/SG/RegeneratingSoilsWithRamialTwigWood
I was disappointed to see that conifers are not to be used because their chemistry is not valuable in this treatment. We have only cottonwoods, scrub oak and tamarisk in the deciduous group, and I'm not sure the tamarisk should be used. All the rest of our trees are juniper, pinion and a bit of ponderosa. If anyone has used this treatment, particularly on a large scale, I love to hear about it. we have about 8 acres of non-rocky hillside to work with.