The Long-Term Agroecological Research (LTAR) Experiment Supports Organic Yields, Soil Quality, and Economic Performance in Iowa. 2013. Crop Management doi:10.1094/CM-2013-0429-02- RS.

Organic No-Till Grain Production in the Midwest. 2013. Reduced tillage of cover crops in organic no-till systems has become the goal of many organic producers in the United States.

Organic Risk Management website for organic and transitioning producers in the Upper Midwest. University of Minnesota Extension.

Soybean Production. Chapter 10 in Risk Management Guide for Organic Producers.University of Minnesota Extension.

Organic Agriculture Research Reports. Iowa State University. Includes soybean disease, fertility, and variety trials for organic production.