Knowing how much biological activity is in your soil is and import step to understanding your soil health. A simple test can help measure this. Burying 100% cotton briefs in the ground will help to show you the activity. The higher the activity level, the less cotton will remain. Having high microbial activity is good for your soil.
1,5,6,9,10,11,12,13,14 and 15 all have additional soil test information. The Soil Health & Nutrient Analysis Guide can be used to understand the soil health test.