I'm not really sure about microgreens as I've never really bothered with them, but from what I've experienced, adding a small amount of worm castings with greatly improve both growth rate and the plants capacity to absorb nutrients.
With an NPK of 1:1:1 it doesn't so much work as a fertilizer, rather a medium for the introduction of beneficial bacteria.
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Worm castings are definitely my secret sauce. I mix worm castings + organic fertilizers into my transplant holes for increased bacteria life, breaking down the organic fertilizers and making them bioavailable at a quicker pace than normal.