Comparison of triallate and cvcloate to postemergence herbicides for grass control in sugar beet

摘要

A field experiment was conducted at the University of Idaho Research and Extension Center near Kimberly, Idaho to compare triallate, cycloate, and postemergence herbicides for grass control in sugar beet. Experimental design was a randomized completeblock with four replications. Individual plots were four rows by 30 ft. Soil type was a Portneuf silt loam (18.9% sand, 60.1% silt, and 21% clay) with a pH of 8.1, 1.83% organic matter, and CEC of 20-meq/100 g soil. '4490RZ' sugar beet was planted May 1,2006 in 22-inch rows at a rate of 57,024 seed/A. Volunteer oat (AVESS), kochia (KCHSC), redroot pigweed (AMARE), common lambsquarters (CHEAL), green foxtail (SETVI), and barnyardgrass (ECHCG) were the major weed species present. Herbicides were broadcast-applied with a CO_2-pressurized bicycle-wheel sprayer calibrated to deliver 15 gpa using 8001 flat fan nozzles. Additional environmental and application information is given in Table 1. Crop injury and weed control were evaluated visually 15 and 26 days after the last herbicide treatment (DALT) on June 22, and July 3. The two center rows of each plot were harvested mechanically October 2.