Dead corn harvesters

Dead Corn #1
Dead Corn #2
Dead Corn #3
Dead Corn #4
Dead Corn #5
Dead Corn #6

During my bike ride this morning, I noticed some abandoned harvesters. And I don’t really understand what exactly is going on. At some point in the year, a field is plowed over and then seeded with this quick growing type of corn plant. They will then leave this field alone to grow. They will not water it or tend it. And at some point every plant will then die. The field will then sit there for a long time. Why, I dont know? Dry out? Rot? Ferment? And then they harvest it. I guess for this hard as a rock corn. Perhaps they gind everything up and feed it to cows. It seems like you can do that to a lot of things… (like cow carcasses — and hence you get BSE).