See more from this Session: Nutrient Management in Forages
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
Beef cattle feedlots pose serious environmental challenges associated with nutrient runoff. Smooth bromegrass is a perennial rhizomatous grass that is widely used in USA and Canada for forage production. The objective of this research is to determine the best management system for producing forage from a bromegrass VTA while maintaining the capacity of the VTA to remove nutrients from feedlot effluent. Four harvest management treatments (1-, 2-, and 3-harvest per year and an un-harvested control) were applied during spring 2005 and evaluated over a 5-yr period in a smooth bromegrass sward on a VTA near Howard, SD. Forage production ranged from 6.2 to 9.9 Mg ha-1in 2005 and from 6.0 to 7.2 Mg ha-1 to 8.5 Mg ha-1 in 2007 for 1- and 3-harvest systems, respectively. Nutrient removal by the bromegrass was 83 kg ha-1 N and 8 kg ha-1 P for the 1-harvest treatment in 2006 to and 311 kg ha-1 N and 32 kg ha-1 P for the 3-harvest treatment in 2007. These results indicated that high amounts of forage could be produced from this VTA and that smooth bromegrass was an effective procurer of N and P.