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Muehlchen, A., R. Rand, and J. Parke. 1990. Evaluation of crucifer green manures for controlling aphanomyces root rot of peas. Plant Dis. 74:651–654. Mutch, D.R. and T.E. Martin. 1998. Cover crops, p. 44–53. In: M.A. Cavigelli, S.R. Deming, L.K. Probyn, and R.R. Harwood (eds.). Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality. Extension Bulletin E-2646, Michigan State Univ., East Lansing, Mich. Rosecrance, R.C., G.W. McCarty, D.R. Shelton, and J.R. Teasdale. 2000. Denitrification and N mineralization from hairy vetch (Vicia villosa Roth) and rye (Secale cereale L.) cover crop monocultures and bicultures. Plant Soil 227:283– 290. Scott, J. and G. Knudsen. 1999. Soil amendment effects of rape (Brassica napus) residues on pea rhizosphere bacteria. Soil Biol. Biochem. 31:1435–1441. Thorup-Kristensen, K. 2006. Root growth and nitrogen uptake of carrot, early cabbage, onion and lettuce following a range of green manures. Soil Use Mgt. 22:29–38. U.S. Department of Agriculture. 1995. United States standards for grades of Bermuda–Granex–Grano type onions. Effective 10 Oct. 1995 (reprinted Jan. 1997). 2 Apr. 2007. <www.ams.usda. gov/standards/onsbgg.pdf>. Zandstra, B.H. 2005. 2006 Weed control guide for commercial vegetable crops. Extension bulletin E-433, Michigan State University, East Lansing, MI. Zandstra, B.H. and D.D. Warncke. 1993. Interplanted barley and rye in carrots and onions. HortTechnology 3:214–218. 74 • January–March 2008 18(1) RESEARCH REPORTS

Nutrient Cycling, Weed Suppression, and Onion Yield Following Brassica and Sorghum Sudangrass Cover Crops