Abstract
Abstract: Understanding the effects of previous herbicide applications on cover crops is important if cover crops are to be successfully established during the same growing season. Greenhouse research was conducted to evaluate the sensitivity of annual ryegrass (Lolium multiflorum), oat (Avena sativa), crimson clover (Trifolium incarnatum), and medium red clover (Trifolium pratense) to EPTC plus R-29148, pendimethalin, and metolachlor plus CGA-154281 in a loam soil with 2.5% organic matter. Annual ryegrass density was reduced 96% by EPTC at 4.48 kg ai/ha and metolachlor at 2.24 kg ai/ha, whereas oat density was reduced 99% and 35%, respectively, from the two treatments. Pendimethalin at 1.68 kg ai/ha reduced annual ryegrass density 14%, but not oat density. Crimson clover biomass was reduced 33% by EPTC, 45% by metolachlor, and 15% by pendimethalin. All herbicides reduced the density of medium red clover > 25%, but biomass was reduced only by metolachlor. Field trials were conducted to determine whether p...
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