From http://www.farmfutures.com/blogs-risk-management-3092

"If you are storing half a million bushels of corn on your farm, at $6/bushel you have $3 million of value sitting there at risk. Many times a farm blanket policy is covering $1M - $1.5M, and it's supposed to cover all farm personal property – equipment, grain, chemicals, livestock - anything that's not a building falls under this category."
"most companies assume grain is covered on your blanket farm policy"

Check with your insurance agent and company if you haven't already.  Slight chance it may be covered under crop or hail insurance.  May also have ins dollars for some of the cleanup.  I have done things on my own that I later learned would have been covered.