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Web URL(s):http://www.ncwss.org/proceed/NCWSS-2012-Proceedings.pdf#page=68
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Author(s):Law, Quincy D.; Weisenberger, Dan V.; Patton, Aaron J.
Author Affiliation:Law and Patton: Purdue University, W. Lafayette; Weisenberger: Purdue University, Lafayette, IN
Title:Influence of nitrogen application timing on the activity of mesotrione applied for large crabgrass control
Other records with the "Foresty/industrial/turf/aqautics/forage/range" Section
Meeting Info.:St. Louis, MO: December 10-13, 2012
Source:67th Annual Meeting of the North Central Weed Science Society. Vol. 67, 2012, p. 68.
Publishing Information:Champaign, Illinois: North Central Weed Science Society
# of Pages:1
Keywords:TIC Keywords: 4-hydroxyphenyl pyruvate dioxygenase; Broadleaf weeds; Digitaria sanguinalis; Herbicide evaluation; Mesotrione; Postemergence weed control; Preemergence weed control
Abstract/Contents:"Mesotrione, a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibiting herbicide labeled for preemergence and postemergence control of numerous grassy and broadleaf weeds, has enhanced efficacy on smooth crabgrass (Digitaria ischaemum) when applied in conjunction with soil-applied nitrogen (N). Our objective was to determine if N application timing influences the activity of mesotrione and its control of large crabgrass (Digitaria sanguinalis). A greenhouse experiment designed as a randomized complete block with 10 treatments and six replications was conducted twice in 2012. The nine primary treatments included applications of N at 49 kg ha-1 applied at 14, 7, 3, and 1 day before mesotrione application (DBA), immediately before mesotrione application, and 1, 3, 7, and 14 days after mesotrione application (DAA). An untreated check was also fertilized the day of herbicide application, but it did not receive herbicide. Nitrogen treatments were soil-applied to each pot using 20 mL of water solution containing urea (46N-0P-0K) to deliver 49 kg ha-1, and mesotrione was applied at 175 g ha-1. At the time of the mesotrione application, plants were in the 3-5 leaf stage except for the 7 and 14 DBA treatments which ranged from 4-leaf to 2-tiller in size. Counts of healthy, bleached, and necrotic leaves were taken one, two, and three weeks after herbicide application and used to determine the percentage of green, bleached, and necrotic leaves, respectively. Aboveground tissue was also harvested, dried, and weighed three weeks after herbicide application. Results were similar between experimental runs. Large crabgrass plants that received N three days prior to the mesotrione application had the highest percentage of bleached leaves followed by treatments receiving N one day prior and the day of herbicide application when measured three weeks after herbicide application (Fig. 1). The number of bleached leaves was >20% more in the 3 DBA N timing compared to N applied 14 DBA or N applied 14 DAA. These results indicate that N fertilization prior to mesotrione application may improve large crabgrass control but the exact causal mechanism of enhanced herbicide activity needs further exploration."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Law, Q. D., D. V. Weisenberger, and A. J. Patton. 2012. Influence of nitrogen application timing on the activity of mesotrione applied for large crabgrass control. Proc. North Cent. Weed Sci. Soc. 67:p. 68.
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    Last checked: 07/16/2013
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    Notes: Item is within a single large file
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