Split a Purchase Order among Multiple Vendors

I would like to know if there is any way of splitting a purchase order among multiple vendors. We are a grain processing company and many of our vendors are farmers. Many farmers have landlords with whom we need to split payments for grain.  For example, we need to create a purchase order (i.e. grower contract) for a farmer and his landlord.  Next we receive the grain from that purchase order.  Then we need to enter bills for both the grower and the landlord according to their crop share split.  Also the grower and landlord may have different prices for