Yeast as fertiliser

[SeaWalnut]

Anybody have experience with regular brewers yeast ( thats also used for bread) as fertiliser?
Yeast is nitrogen fixer but needs carbon and a fast available carbon like sugar so basically you trade sugar for nitrogen by growing yeast ,just like nitrogen fixing plants do.

[johnnyv]

Saccharomyces cerevisiae does not fix atmospheric nitrogen, it requires a nitrogen source to grow.
There has been experiments introducing nitrogenase genes into yeast but brewers yeast certainly doesn't have them.
Yeast lees are rich in nitrogen because of all the supplemental nitrogen(usually diammonium phosphate) feed to the yeast to allow protein synthesis.

[roblack]

there's a past post about using dead yeast and kelp extract spray on blooms to increase fruit set and yield

[simon_grow]

Here’s the article

https://scihub.org/ABJNA/PDF/2010/3/1-3-421-429.pdf

Simon

[johnnyv]

The paper doesn't state that yeast fix atmospheric nitrogen.

Interesting I did not know yeast produced cytokinins.
I use spent rum wash(Home spirit making is legal in NZ) as fertiliser which works great but the yeast are definitely dead in it.

[SeaWalnut]

Here is a study that says it fixes nitrogen .
But it doesnt fixes at the level i initially toght so i wouldnt count on it to fix much nitrogen in the cyanobacteria stile so i agree with you Johnny.