My garden soil tests high in all nutrients so I don't use fertilizers BUT nitrogen is not tested because it is so volatile. You can not get an accurate test and it is always recommended to add nitrogen.
Bone or blood meal do not work for me because the skunks can smell those and they dug up my seedlings one year just to get at the fertilizers.
Now I use feather meal 12-0-0 and the skunks leave it alone.
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