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Effects of a Grass-Selective Herbicide in a Vetch–Rye Cover Crop System on Nitrogen Management

^a USDA Sustainable Agriculture Network, Beltsville, MD 20705-2351
^b USDA-ARS, Animal and Natural Resources Inst., Beltsville, MD 20705
^c Dep. of Natural Resource Sciences and Landscape Architecture, Univ. of Maryland, College Park, MD 20742
^d Lower Eastern Shore Research and Education Center, Salisbury, MD 21801

View larger version (39K): [in this window] [in a new window]   Fig. 1. Twenty-year average monthly rainfall at Poplar Hill research station and monthly rainfall distributions during the study period of September 1989 to August 1991.

View larger version (26K): [in this window] [in a new window]   Fig. 2. Corn N uptake (kg N ha–1) in 1990 (2a), 1991 (2b), and 1990–1991 average (2c) after cover crops of: rye killed early (RYP) or late (RYL), vetch killed late (VTL), vetch–rye mixture killed early (MXP) or late (MXL), or no cover (CKL).