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The Center for Native Grasslands Management

Title: Switchgrass and Eastern Gamagrass establishment and management using herbicides
Year: 2002
Author(s): Coffman, C. B., Vough, L. R.
Source Title: Proceedings of the Third Eastern Native Grass Symposium
Source Type: Proceedings
pages: 84-85
Original Publication:  
Abstract: Switchgrass and eastern gamagrass are slow to germinate and easily overwhelmed by annual weeds. There are no herbicides registered for pre-emergence weed control. An investigation was conducted with corn herbicides to determine their effectiveness. Seed was sown and herbicides were applied on June 10, 1999. Visual weed cover and crop stand estimates were made in late August 1999. Weed cover ranged from 20% to 50% and crop stand from 10% to 50%. Switchgrass was lowest in plots treated with alachlor plus atrazine and weed cover was lowest in plots treated with s-metolachlor plus atrazine. Eastern gamagrass crop stand in 2000 ranged from 40% to 60% and weed cover from 30% to 60%. in May 2000 a post-emergence application of 2,4-D and dicamba was made across all treatments including the controls to manage perennial dicots. All plots were mowed to six inches in July and biomass samples were obtained four weeks later. Switchgrass yields ranged from 892 g/m2 to 572 g/m2 for acetochlor plus atrazine and s-metolachlor plus atrazine, respectively. Eastern gamagrass yields ranged from 611 g/m2 to 958 g/m2 for dimethenamid plus atrazine and alachlor plus atrazine, respectively.
Publisher: The North Carolina Botanical Garden, Chapel Hill, NC, October 1-3, 2002. Omnipress, Madison, WI
Editor(s): J. Randall