By: Gil Smart, Treasure Coast Newspapers
The last citrus groves in Martin County?
They soon could go the way of the dinosaur, says Rick Hartman.
Hartman is a commercial real estate broker whose family moved here in the 1880s and who has watched the industry shrivel like a dried-up fruit rotting in the dirt. In his Palm City office the week between Christmas and New Year's Day, he unfurled a large map of Martin County, color-coded to show how land is being used…