|Richard Jr, Edward|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/12/1996
Publication Date: N/A
Technical Abstract: Johnsongrass control following treatment with sulfometuron at 0.05, 0.09, or 0.14 lb ai/A PRE in October after succession-planting 'CP 72-370' sugarcane was compared to standard treatments of metribuzin (1.8 lb/A or terbacil (1.4 lb/A). All treatments included a standard mid-May POST application of asulam (3.3 lb/A) the following year. Sugarcane shoot population 10 wk after planting was reduced 35, 58, and 68% by sulfometuron at the low, middle, and high rates, respectively, only the first year. Johnsongrass panicle counts in August of the first growing season were higher for metribuzin (6,200 panicles/A) and terbacil (5,400 panicles/A) than for sulfometuron (3500 to 3900 panicles/A) when averaged over years. Sugarcane stalk population prior to harvest was lower for sulfometuron at 0.14 lb/A (14,100 stalks/A) than at 0.05 lb/A (16,800 stalks/A) in 1994 only. Stalk population was 17% greater for terbacil (17,100 stalks/A) than for sulfometuron at 0.14 lb/A in 1994 but 11% less than for the same sulfometuron rate in 1995. Sugar yields in 1994 were equivalent (4700 to 5500 lb/A) for the sulfometuron and standard treatments. In 1995, sugar yields with the lower rate of sulfometuron was 17% greater than for metribuzin, but was equivalent to terbacil. Despite the early injury, sugar yields following treatment with sulfometuron were similar to the standard treatments because johnsongrass control was improved.