Fertilizer industry finds its alternative energy: corncobs

American agriculture has become increasingly dependent on foreign sources of natural gas, a key ingredient in the nitrogen fertilizer that farmers use to get high yields of crops such as corn and wheat.

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<p><a href="http://www.physorg.com/news164537641.html">Fertilizer industry finds its alternative energy: corncobs</a></p> <p> American agriculture has become increasingly dependent on foreign sources of natural gas, a key ingredient in the nitrogen fertilizer that farmers use to get high yields of crops such as corn and wheat.</p>