(AP) — In this Feb. 1, 2012 photo, a machine crushes canola and soy to make biofuel and/or food grade canola oil Willamette Biomass Processors plant in Rickreall, Ore.

Some farmers want to grow more canola because it's a profitable alternative to grass seed and wheat. But other farmers who grow specialty vegetable seeds worry about contamination from canola. (AP Photo/The Oregonian, Beth Nakamura)