Royal DSM NV, the world’s largest vitamin manufacturer, expects to begin producing cellulosic ethanol in the U.S. by July as the government considers reducing the amount of renewable fuel that oil companies will be required to buy. The $250 million plant in Emmetsburg, Iowa, is a joint venture with ethanol maker Poet LLC and will produce about 12 million gallons (45 million liters) this year, DSM Chief Executive Officer Feike Sijbesma said today.