I know this will be controversial, but I think your soil test shouldn't be interpreted that way in regards to nitrogen. They're only measuring the ions of NO3 and NH4. It really doesn't mean anything. For example whenever a protozoan in your soil takes a poop after eating bacteria, then those NH4+ ions will be snatched away within seconds by hungry bacteria and fungi. At least it better be! If you scored anything significant in your test for Ammonia or Nitrate, it would indicate high free levels of N ions that remain uneaten because there is no life around to eat it.Just got back my soil test from a Coots mix blend.
I used Malibu dynamic compost and followed the standard amendments. Only diff was that I was missing about half basalt, and Glacial rock dust when i sent out the test. I figured these were slow release additives and wouldn't affect it too much.
It is possible that the sample wasn't completely accurate. The test has a 1/4 cup container. I had my soil mixed really well and did my best to get a good recc.
Anyway, my Nitrogen is way low. Also low on some micros-Iron, Manganese, Zinc, Copper Boron.
I want to try to correct these and send off another test before I plant in about 3 weeks. I know Bat Guano is good for Nitrogen, but seems to split people as to whether it is a good move. What about micros?
Plants are very good at regulating their uptake of nitrogen. When few free ions are available the plant can respond by sending out exudates from their roots with "signalling" molecules that affect the behavior and metabolism of other creatures living in the rhizosphere. Plants even regulate their uptake of nitrogen as well even when its in available form.
You can actually get a real nitrogen test - well not really accurate but it's the best we have right now. Farmers use it though, and it's usually called a "Nitrogen Management Analysis Report" or something like that. They measure the biological activity in your soil, as well as the amount of amino-acid or other organic nitrogen molecules in there. Then they make an estimate (based on the local climate) of the rate of release of available N throughout the season. It's based on a lot of assumptions of course, but I hope you know why the testing and particularly the interpretation of various tests of nitrogen are problematic.