@ret  You will have to make the call based upon all of the facts and circumstances that you can gather from your client.  How are the books kept for the hay farm and for the beef farm? What amount of his time is devoted to each endeavor?  Is there a direct nexus between the hay farm and the beef farm? 

Only you and your client can determine if you can file a Schedule F for the hay farm and a Form 4835 for the beef farm.