I was 5 when we quit filling silo. So I have no experience:
The most common silo gases are carbon dioxide (CO2) and nitrogen dioxide (NO2). Types and concentrations of silo gas vary depending on whether the silo is a conventional silo or oxygen-limiting silo and how much time has passed since the silage was placed in the silo.
Co2 is heavy and you will be breathing air with no oxygen.
No2 is more often the problem, it reacts with your lungs and causes the lungs to fill with fluid. It is also heavier than air so will pool at the bottom of a container. In light concentrations the no2 can show up a couple hours later, in heavy concentrations it will be pretty quick.
Either one isn’t a problem if the air is stirred around so bunker and bag silos exposed to the winds around are rarely a problem. The upright silos are the containers that trap the gas.
I hear after 2 weeks of typical fermenting the danger passes and no more issues, but this wasn’t a typical year, silage May have been put up very late or very cold.
I’m not familiar with putting plastic over the top of a silo silage like that in an upright, I’ve heard it was a Harvestore type perhaps the top bladder was leaking and this was an effort to seal it? This might affect how and when the gas was formed/ stored as well.
No matter doesn’t change the outcome, I feel so for the families.
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