I really don’t know. This is a first for me. I have never done one of these tests before.
To be honest, this stuff confuses the heck out of me. I understand this just about as much as I understand women. Which is somewhere between clueless and hopelessly lost . . .
Why isn't a test for nitrogen run? Several reasons, including cost, reliability, time, and lack of relationships between soil nitrogen levels and yield. Soil nitrogen levels change greatly due to moisture levels, microorganism activity, temperature, leaching, and organic matter levels. A test run on samples taken in November (to allow time for lime applications to react for spring) would not give reliable results about the nitrogen status of that soil in March. Soil organic matter is estimated, and from that a number is derived for the amount of nitrogen the soil will probably supply.