Good article, but I couldn't get it to stay on the page about bio-drilling. ...daikon radishes which I cover crop with

A good thing to think about when selecting cover crops is what you want to achieve. For example, people with sandy soil or low rainfall want a cover that will retain moisture once incorporated. A different reason is suppressing pest insects. Cleary the choice will differ in these cases. Besides building live carbon in the soil you might want to add nitrogen, improve soil structure, reduce soil erosion, and provide weed control, This isn't my list of desirables, it comes from "Managing Cover Crops Profitably" (244 pp.) published by the Sustainable Agriculture Network. My edition is dated 2007; I'm sure there's a later one. Regards, Peter.