1099-patr box 6

We own a farm and rent it to the farmers, who receive a portion of the crop proceeds.  I receive a 1099-PATR from the grain coop for my crop proceeds.  This year's 1099 included an amount in Box 6.  I am able to enter the Box 1 and 3 information through Wages & Income > Business Items > Farm Income and Farm Rental.  Where should Box 6 amounts be entered?