Crop tolerance and broadleaf weed control with bromoxynil/pyrasulfotole alone and in tank mixtures

摘要

A study was conducted at the University of Idaho Research and Extension Center near Kimberly, Idaho to evaluate crop tolerance and weed control with bromoxynil/pyrasulfotole applied alone and in combination with other herbicides and with fungicides inirrigated spring barley. 'Moravian 69' was planted April 2, 2010 at 95 lb/A. Experimental design was a randomized complete block with four replications and individual plots were 8 by 30 ft. Soil type was a Portneuf silt loam (20.4% sand, 71% silt, and 8.6% clay) with a pH of 8.1, 1.5% organic matter, and CEC of 17-meq/100 g soil. Herbicides were applied with a CO_2-pressurized bicycle-wheel sprayer with 11001 flat fan nozzles calibrated to deliver 10 gpa at 23 psi. Environmental conditions at application are shown on Table 1. Common lambsquarters and annual sowthistle densities averaged 14 and 1 plants/ft~2, respectively. Crop injury was evaluated visually 6 and 32 days after application (DAA) on May 27 and June 23, respectively. Weed control was evaluated visually 10 and 32 DAA on June 1 and 23, respectively. Grain was harvested August 20 with a small-plot combine.