[SpaceAgeRobin] CULTURE: Soil Test

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I purchased a "Soil Master" soil test kit (Mosser Lee brand) to test the soil in my raised iris beds.  Now I'm wondering if this type of test is very accurate.  Perhaps I should have sent a soil sample to the county extension office instead?  Anyway, the results of my test were:

pH--8

Nitrogen--low

Phosphorus--medium

Potassium--high

The booklet that accompanied the kit states that irises prefer pH between 6-8, and medium levels of Nitrogen, Phophorus, and Potassium.

I am thinking of adding alfalfa meal to the beds in an attempt to increase Nitrogen levels.  Does anyone have any opinions or advice on this?  I am growing bearded iris in these beds.  Also, some of the iris are space age.

Kathy
S.E. lower MI
Zone 5b