In other words, agriculture can supplement what is left of the manufacturing workforce because Michigan is second to California in crop diversity. Therefore, commercial agriculture can play a huge role in Michigan's economy.
One example is maple syrup. As climate change destroys maple sugaring in the northeast, Michigan stands to gain.
See NWMI.SecondwaveMedia: How sweet it is: Michigan one day could be world's leading producer of maple syrup [thanks for the link K]
And it is worth mentioning that as sweeteners go, maple syrup is a good source of manganese and zinc.