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I have some 30gal trash cans and contractor trash bags to start making silage. I got up and out early so the dew and rain was still on the grass. The mower clogged constantly of course, but that wasn't too much of a problem really. The 1st can wasn't filled all the way because I neglected to pull the bags up tight when putting the grass in. The 2nd can, in this image, is as full as the contractor bags will allow and still close. I fear trying to lift it with the handles will just rip the handles out, so I'm using a handcart/dolly to move the cans around. I have 3 more cans to fill, which I'll do in the mornings before the sun gets up too high.
I put a 6-8 inch layer of grass, into the can then stomped it down really well. The grass is encased in 2 extra, heavy duty, contractors, trash bags with as much air pushed out of the bag top as possible. The cans will protect the bags from any insects or mice that may be able to puncture or chew into the bags. The goal is to keep the air out. Oxygen allows aerobic microbes to rot the grass in a way that makes it toxic to animals. Removing as much air as possible allows the scant oxygen left behind to be used up quickly. Then anaerobic microbes take over and start the fermentation process. I didn't add anything to mine, like molasses, and I'm relying on the extra dew/rain moisture to help with the fermentation process. The grass is quite sticky right now.
I won't know, until this winter, if this method will work or not, but I'll certainly report back on the results.