Evaluation of Postemergent Herbicides on Rhizoma Peanut Injury and Yield
2006
Ferrell, Jason A. | Sellers, Brent A. | Mudge, Christopher R. | Smith, Clyde A.
Rhizoma peanut (Arachis glabrata Benth.) is one of the few high-quality legume forages that will persist in Florida. Rhizoma peanut hay is valued by horse and cattle producers, but weeds reduce its quality and value. Herbicides are often required for weed control, but it is not known which herbicides can be applied without causing injury and yield loss. Herbicides were applied to the rhizoma peanut cultivars 'Florigraze' and 'Arbrook' in 2004 and 2005 at 3 or 21 days after clipping (DAC). Dicamba + 2,4-D was highly injurious at both application timings, while hexazinone was most injurious when applied at 21 DAC for both cultivars. However, no herbicide applied at 3 DAC resulted in yield loss for either cultivar. When applied at 21 DAC, dicamba + 2,4-D reduced yield by 41 and 22% of Florigraze and Arbrook cultivars, respectively compared to the non-treated control. Similarly, hexazinone (0.28 and 0.56 kg/ha) reduced yield of Florigraze and Arbrook cultivars by at least 50 and 36%, respectively, compared to the non-treated control. Applications of 2,4-D alone reduced Florigraze yield by 41% compared to the non-treated control, but Arbrook yield was not affected by this herbicide. Florigraze appeared to be more sensitive to all herbicides with regard to visual injury and forage yield. Applications of imazapic, imazamox, and 2,4-DB did not result in visual injury or yield loss at either application timing for either cultivar.
显示更多 [+] 显示较少 [-]