Colorado State University researchers say wind-blown corn pollen can pollinate corn plants up to 600 feet (>180 meters) away, raising questions about the size of the buffer zones needed to isolate genetically modified crops.In February, Boulder County commissioners voted to allow farmers to grow genetically modified corn on county open space.But commissioners said that neighboring growers of conventional crops could demand a 150-foot (45 meters) buffer zone around the genetically modified varieties.</p><p><a href="http://rockymountainnews.com/drmn/local/article/0,1299,DRMN_15_2110127,00.html">Rocky Mountain News: CSU study pops theory on bio-corn buffer zones</a>