Comparison of non-glvphosate herbicide combinations with glyphosate for broadleaf and grass weed control in field corn

摘要

A study was conducted at the University of Idaho Research and Extension Center near Kimberly, Idaho to compare non-glyphosate herbicide combinations with glyphosate for broadleaf and grass weed control in glyphosate tolerant field corn. 'BKC46-60' RRcorn was planted May 12, 2009, on 30 inch rows at 36,000 seed/A. Experimental design was a randomized complete block with four replications and individual plots were 10 by 30 ft. Soil type was a Portneuf silt loam (20.4% sand, 7.1% silt, and 8.6% clay) with a pH of 8.1, 1.5% organic matter, and CEC of 17-meq/100 g soil. Kochia (KCHSC), common lambsquarters (CHEAL), redroot pigweed (AMARE), green foxtail (SETVI) and barnyardgrass (ECHCG) were the major weed species present. Herbicides were applied with aCO_2-pressurized bicycle-wheel sprayer with 11001 flat fan nozzles calibrated to deliver 10 gpa at 22 psi. Environmental conditions at application are in Table 1 below. Weed control was evaluated visually 17, 39, 52, 78 and 119 days after application (DAA) on June 4, June 26, July 9, August 4, and September 14, respectively. Crop injury was evaluated visually 10, 36, and 77 DAA on July 9, August 4 and September 14, respectively. For brevity, only the 39 and 119 DAA evaluations are reported. The crop was harvested November 17 with a small-plot combine.