Even on a high, dry plateau in central Oregon, it's hard not to find a riot of grass. Farmers grow Kentucky bluegrass for the seed, and lining irrigation canals are wild varieties of rabbit's foot and water bent, along with stubby lawn grasses that, grown thick, would make an excellent putting green. And recently, a new variety has joined the scene: feral, genetically engineered bentgrass. Early this past decade, the Oregon Department of Agriculture conducted a field trial just north of the town of Madras, planting 400 acres of bentgrass engineered by the Scotts Co. to resist the popular weedkiller Roundup. Scotts hoped the bentgrass, if approved, would be a financial bonanza, allowing golf courses to douse their fairways with herbicide, mimicking what has become standard practice at farms growing Roundup Ready corn and soybean countrywide.