There are blockchain projects that register the supply chain and link contractors to farmers.
Benefits for the farmer is that he can sell a product for a good price and not need to have the cash to pay contractors first.
It can create a trust chain and no coin is needed. I can bring you in contact with the organization that develops this.
In 2014 I found it a great idea to manage a currency but greed makes most currencies useless.
For now, it seems only Bitcoin shall survive with a value.
In the future maybe trust chains can be supported easily with Bitcoin.