Would yeast be an effective additive in liquid fertilizer? Thinking about mixing with water and putting on the soil for adding microbes,will this work? How much yeast to how much water? Thanks

There are literally thousands of types of beneficial aerobic soil microbes that you can grow and add to your soil or add use in foliar spray biostimulant applications (i.e. aerobic bacteria, fungi, algae, protozoa, actinomycetes, yeasts, etc.)

Various forms of algae and yeast will naturally occur in a good aerated compost tea recipe, made from good mature balanced compost, enriched with high forms of nitrogen and proteins from decomposed animal manures, or from fish or seaweed products. Seaweed is a cousin to algae organisms.

Ground corn products used in aerated compost tea recipes will always generate great colonies of beneficial fungi organisms for protecting the soil and plants from fungal diseases, as well as improving the soil by feeding soil organisms.

Happy Gardening!

In other words, yes. Garden-Ville sells something called Rocket Fuel with yeast in it.

As for you I think you will have to experiment with it to see what works. Please let us know, though, so we don't have to redo your experiments - or we can benefit from your experience.