Posted by kyhayman on August 24, 2009 at 07:32:06 from (75.105.0.38):
In Reply to: Question on hay fires? posted by Larry here on August 23, 2009 at 21:24:40:
Cody gives you a good explanation of the process. Heating is part of curing. Microbes continue to consume oxygen and plant nutrients until the moisture content drops below the point they can reproduce. Just like with corn or soybeans. Put them in the bin too hot and they will spoil. The heating from the hay can ignite dry hay either in the same bale or adjoining bales. Same can happen with hayledge if the silo isnt airtight. Makes a nasty silo fire.
Density makes it worse, since moisture and heat have a harder time getting out of the bale. Thats why we want hay for round bales DRIER than we want hay for small square bales at baling. Large square bales have a higher density still. With round bales, you can get away from the fire risk by storing outside where heat can dissipate. Inside a barn tightly stacked round bales are a great fire hazard if they are too wet going in. A lesser risk is given the same moisture a barn stored stacked round bale can mold when a loosely stacked small square in the same barn wont.
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