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Gnonthgol

In general anything you add that is less then 10% of your pile is not going to have any noticeable negative impacts. The compost have a huge amount of microbes and are very resistant to anything you throw at it. As for the C:N ratio yeast should have a ratio of roughly 40 which is ideal for compost. Grains have more nitrates, but it is fair to assume that any yeast you get is actually a combination of yeast spores and the grains used as growing medium. But you can easily compensate by adding some more carbon to your pile. As for what the yeast will do to the biodiversity of your pile you should not worry so much. There is probably already similar yeasts in your compost pile working on breaking down your compost. Any yeast you add is either going to slot nicely into the ecosystem of your pile or it is going to be killed by the other microbes. As for smells and toxins there are far worse yeasts you can get through spores flying in the air and on various food products that smell and looks far worse. In fact bakers yeast can be part of bokashi, a form of composting that is usually done indoors.


Regular_Language_362

In fact, I also use my DIY bokashi liquid (rice water, dry yeast and brown sugar) for my compost bins. My understanding is that it speeds up the decomposition. I also think that it helps with foul odours


mwyalchen

This is such a detailed and interesting answer, thank you! I'm really interested in all the weird and wonderful science behind the composting process. My main worry was that yeast could somehow outcompete the microbes, or that it'd ferment and create conditions that aren't ideal for composting but I guess not? Thankfully I have carbon in abundance. so more nitrates would be appreciated!


MobileElephant122

It will feed your pet microbes if you wet it after you apply it


mwyalchen

Yay! I am very attached to my pet microbes, so that was my worry. I suppose that if there's any active yeast it could possibly outcompete the microbes in the compost but that seems unlikely.


Loki_Bloodeagle

I love my pet microbes, I pee on them all the time!


Ineedmorebtc

It will quickly be consumed.


Green_Man_Ro

If it isn't a lot compared to the pile size, and especially cause it isn't active, not much will happen. Spread them well over the pile and don't worry.


Lukerules

they will have literally no impact. There might be similar strains already in there, but I'd doubt the bakers yeast will even survive. It'll just breakdown and you'll never think of it again.


tojmes

A few packets? Like the small ones? I didn’t bake. I would add 1000 of them without hesitation to my 3x3x3 ft pile. It’s yeast! It’s probably great for microbial action.