Testers do not give you enough information to determine whether or not you need to fertilize and how much. Mixes are costly and often contain 90% cheap seeds and 10% "premium" seeds.
Take a soil sample. Scratch back the leaves and grass and use a sharp shooter to take a plug of soil. Take at least 3 per foot plot and mix them together. The Soil lab needs at least a pint of soil for a good sample. When you fill out the information on the soil test sheet list peas, clover, wheat, and anything else you would like up to 5 choices. Put me down as the agent, Robbie Hutchins and put my address
rhutchins@agcenter.lsu.edu. I should get an email of your test results. After you get it email me with a phone number and I will call you and talk to you about it. I do this every day.
PS that's good advice about enhancing native browse like blackberry, dewberry, honeysuckle, etc.
Robbie aka Big Hutch
Area Forestry /Wildlife Extension Agent