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ARS Home » Midwest Area » Morris, Minnesota » Soil Management Research » Research » Publications at this Location » Publication #84995
Title: EFFECTS OF TIME OF APPLICATION OF NICOSULFURON ON TOLERANCE OF SEVEN CORN HYBRIDS AT LAMBERTON, MN IN 1995

Author
item LUESCHEN, WILLIAM - UNIVERSITY OF MINNESOTA
item Westgate, Mark
item GETTING, JODIE - UNIVERSITY OF MINNESOTA

Submitted to: University of Minnesota Special Publication
Publication Type: Abstract Only
Publication Acceptance Date: 8/27/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: This study evaluated the effects of nicosulfuron on corn injury and yield when applied onto: 4-inch, 10-inch, and 20-inch corn. A randomized complete block design with a split plot arrangement of treatments with four replications and a plot size of 10x30 ft was used. The main plots consisted of seven corn hybrids ranging in maturity from 80-110 day relative maturity. Subplots were the nontreated check and the three application timings of nicosulfuron. Nicosulfuron was applied at 0.031 lb/A with crop oil concentrate at 1% v/v and 28% N solution at 2.5% v/v. At the 4-inch stage, the application of nicosulfuron caused no significant response in any of the parameters evaluated. At the 10-inch stage, nicosulfuron caused chlorosis from 8-16 days after application. Hybrid 3963, exhibited slight plant height reduction, but there were no important effects on tasseling, silking, or pollination. Hybrid 3917 exhibited reduced grain yield (12 bu/A). At the 20-inch stage five of the seven hybrids exhibited chlorosis 9-11%; the other two hybrids had ratings of 4-5% five days after treatment. Plant height reductions had only minor effects on tasseling, silking, and pollination. Yield reductions were small, 1-5 bu/A. With hybrids 3751 and 3917, however, nicosulfuron reduced yield by 11 and 15 bu/A, respectively. Malformed ears (apical region with fewer rows than normal) were observed in all hybrids less than 100-day RM sprayed at the 10-inch or 20-inch stage. More plants developed malformed ears when spraying was delayed. Nicosulfuron sprayed at the 20-inch stage decreased potential kernel number up to 35%. The small effect on final yield probably reflects kernel size compensation and poor seed set of tip kernels.