It would be more accurate to estimate 99% of farmland is owned by corporate conglomerates who request extensions for their 1120 filings because, after tax loopholes, they don't owe any tax anyway.  But if you are dealing with the dwindling number of family farmers who are old enough to remember the quaint custom of filing by March 1, they just need to be re-educated.  That was then, this is now.  The rest of the country in general, and software behemoths in particular don't care about them, except maybe at dinnertime.  

Use software to do the return, then use a calculator if you need the 2210-F or Schedule J.  Print out a paper return, and mail it with a check.  Interest rates are going up; your client will enjoy the extra income from a week's float.