Potassium bicarb nutrient value?

I'm wondering if spraying plants with potassium bicarb has any nutrient value. I've looked around and can't find anything. I spray my plants about every 10 days preventitively. Just a thought any input appreciated.

I was told it helps prevent powdery mildew. I spray as a preventative with it and a little powder goes a long way with this stuff.

It seems to act as a fungicide so no real nutritional value.