Keep in mind in these barters, fairly often they take grain at par cost $USD for fert at par cost $USD... With no interest or very little worked into the deal.
http://www.businesstimes.com.sg/energy-commodities/brazils-bartering-farmers-raise-risks-for-nutrien http://www.businesstimes.com.sg/energy-commodities/brazils-bartering-farmers-raise-risks-for-nutrien
http://www.businesstimes.com.sg/energy-commodities/brazils-bartering-farmers-raise-risks-for-nutrien http://www.businesstimes.com.sg/energy-commodities/brazils-bartering-farmers-raise-risks-for-nutrien