( Alysicarpus vaginalis ) (74%) and hairy indigo ( Indigofera hirsuta ) (64%) cover crops ( Linares et al., 2008 ). Thus, the sunn hemp allelopathy carryover should be considered when selecting it as a cover crop. Sorghum-sudangrass ( Sorghum ×drummondi ) is a
; Haramoto and Gallandt, 2004 , 2005 ; Matthiessen and Kirkegaard, 2006 ; Mojtahedi et al., 1991 ). This study was therefore undertaken to determine the effects of several brassica cover crops and sorghum sudangrass on nutrient cycling, weed suppression
plots were 612 ft 2 (25.5 ft long by 24 ft wide). Whole plot treatments were ‘Mancan’ buckwheat, ‘Iron & Clay’ southernpea, black oats, ‘Grazex II’ sorghum-sudangrass, or a no-cover crop (control). The subplot treatment was planting time of lettuce
to create partial budgets for five summer fallow treatments: sunn hemp, velvet bean, cowpea, sorghum-sudangrass, and use of tillage to manage weeds preceding a summer squash crop. Partial budget analyses are used to evaluate the relevant costs and
. capitata ) are annually produced ( Elwakil and Mossler, 2016 ; USDA-NASS, 2014 ). A major advantage of sunn hemp over many cover crops, particularly sorghum-sudangrass (SSG) [ Sorghum bicolor (L.) Moench], is that it is a poor host for fall armyworm
and potentially cycle it to the following crop. Delgado et al. (2007) reported other benefits from summer cover crops grown with limited irrigation and observed a 12% to 30% increase in total yield and marketable tubers when potato followed sorghum-sudangrass
; Reynolds et al., 2000 ). Sorghum–sudangrass hybrids contain the cyanogenic glycoside dhurrin that, when hydrolyzed, yields cyanide, a nematicidal compound ( Widmer and Abawi, 2002 ). Brassicaceae species contain glucosinolates that react with myrosinase
, weed suppression, and onion yield following brassica and sorghum sudangrass cover crops HortTechnology 18 68 74 Weston, L.A. Harmon, R. Mueller, S. 1989 Allelopathic potential of sorghum–sudangrass hybrid
studies have documented use of cover crops in strawberry production. LaMondia et al. (2002) found sorghum–sudangrass [ Sorghum bicolor × S. sudanense (Piper) Stapf] and ‘Saia’ oat ( Avena strigosa Schreb.] cover crops decreased pest populations and
production, particularly in the southeastern United States. In onion production on muck soils in Michigan using brassica ( Brassica sp.) cover crops or sorghum × sudangrass (sudex) resulted in similar weed suppression and soil fertility regardless of the