Univ. of Illinois Variety Trials on Winter Hardiness and Burndown Characteristics
In 2005, U. of IL extention educator Mike Plumer began a three-year trial on annual ryegrass varieties, to determine which would be most able to withstand harsh Midwest winters. Simultaneously, he tested the same varieties on how easily they succumbed to herbicide in the spring. Click here to see a report of the results, published in 2008.
Conservation Tillage Information Center (2014 – 15) - cover crop impact on corn and soybean yield. (pages 24 – 27 are key)
University of Wisconsin Extension – herbicide rotation restrictions in forage and cover cropping systems
Penn State University – herbicide carryover table 2012 (revised)
Purdue University – Cover Crops and the Corn and Soybean Herbicide Rotational Restrictions
2007 Cover Crops and Soil Organic Matter – Hoorman, Islam study
2000 Annual Ryegrass Reduces Soybean Cyst Nematode – Canadian University paper