I ran across a very interesting (new to me) blog this week on soil with an article on soil moisture and its importance to agriculture. The University of Georgia weather network cooperates with the group described in the article; that group collects soil moisture from agricultural weather networks across the US because it is critical information for producers to know. It is also used by the authors of the weekly Drought Monitor and many others. I encourage you to take a look at the blog and see what other information you can pick up about soil characteristics. I have subscribed and hope to share information from time to time as well.

Dry ground. Source: https://commons.wikimedia.org/wiki/File:Drought_crack,_South_Texas,_Late_March_2013.JPG