Egide Dostie Jr. (left), Selena Brown and Egide Dostie Sr.

Egide Dostie Jr. (left), Selena Brown and Egide Dostie Sr.’s Dostie Farm is one of six dairies working with Stonyfield to hone cost-effective methods for measuring soil carbon. Photo courtesy of Meg Wilcox

Stonyfield Organic’s farmer relationship manager, fires up the AgriCORE soil sampling tool in a pasture with sweeping views of central Maine’s rolling hillsides at Dostie Farm, an organic dairy. The auger bit whirrs as it slices through clover and grass, spiraling downward into the earth to retrieve a sample from the 650-acre (263-hectare) farm on a blustery October day.