"9.  Besides the fresh smell of dry grass hay, your hay can also smell, well… like it’s cooking.  Which it can be!  If hay is baled too wet, it begins to decompose, like a compost pile.  Heat is generated.  Sometimes, combustion takes place and your entire haystack can be on fire.  If you’ve stacked it in a barn, there goes your barn!  Haystacks can at least not take any buildings with it should it catch on fire.  For a couple of years, we grew sudan, which is a sorghum.  It really looks like corn stalks to me.  It was hard to get it to dry, and you could walk by it and smell it “cooking”.  The cows loved it.  I imagine it was slightly sweet…" - Todd Hoff