Hey Mole Farmer!
We’re a big fan of A and L Western Laboratories. They offer a graphics analysis option that is great for visual learners, and can do a multitude of different tests for soil and soilless media alike. They also offer a recommendation option for a small added fee, which is a spectacular resource. The A and L Labs website has very specific instructions for packaging and shipping off your sample. If forgoing the test, try adding Blood Meal, Bone Meal and Sul-Po-Mag to your soil and incorporate to a depth of about 6 inches. These three amendments together should take care of replenishing most or all plant macro nutrients that are required for vigorous growth and production.
Happy Planting!