You fool, I've been playing farming simulator for the past month

Silage is fermenting crops under an oxygen deficiency(this is crucial to stop the crops from rotting) to preserve the gras. Its basically an upscaled version of making sauerkraut.

Easy as that.

But yeah, this devinetively isn't something everyone knows and also most people will never need this in their lives.

A lot of that knowledge is passed on between generations, and was trial and error, rather than formal training.

Cool challenge

Anaerobically fermented grass, it's cattle feed for the winter, it ferments under covers without (much) air getting to it, that way it also doesn't rot.

I think. But I'm a network engineer so that could be wrong. It's just what I think I heard in some random source I don't remember.