Reports by Douglas Karlen

	Agriculture in the U.S. Corn Belt: Past, Present, and Future.
	Cover Crop and Manure Effects on Soil Properties in a Corn Silage System.
	Evaluation of Organic Pest Management Treatments for Bean Leaf Beetle in Soybean in Iowa.
	Soil Carbon Needs Limit Biomass Ethanol Feedstock Supply.
	Will Sulfur Limit Bio-fuel Corn Production?.