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ARS Home » Midwest Area » Morris, Minnesota » Soil Management Research » Research » Publications at this Location » Publication #84990
Title: TOLERANCE OF FOUR CORN HYRIDS TO (RIMSULFURON & THIFENSULFURON) AT LAMBERTON, MN IN 1996

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

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: The objective of this study was to evaluate the effects of postemergence application of (rimsulfuron & thifensulfuron) on tolerance of corn hybrids ranging in maturity from 85 to 105 day relative maturity. This study was conducted on a Normania loam soil containing 4.9% organic matter, pH 6.5 and soil test P and K levels of 54 and 452 lb/A, respectively. A randomized complete block design with a split and plot arrangement of treatments with four replications and a plot size of 10 by 30 ft was used. The test site was chisel plowed and fertilized with 150 lb/A of nitrogen as anhydrous ammonia in the fall of 1995. On 4/29/96 alachlor at 3.5 lb/A + cyanazine at 2.0 lb/A were applied and the site was tilled 2 to 3 inches deep with a field cultivator operated at 5-6 mph. The corn hybrids were planted on 4/29/96 in 30-inch rows at a seeding rate of 31,000 seeds/A using a John Deere 7100 planter. All treatments were applied with a tractor-mounted sprayer delivering 20 gpa at a pressure of 40 psi. The sprayer was equipped with 8002 flat-fan nozzles spaced 15 inches apart on the boom and the boom height was adjusted to give a proper spray pattern above the crop canopy. All plots were hand-weeded. No visible corn injury nor chlorosis was observed with POST (rimsulfuron & thifensulfuron). Tasseling, pollen shed and silking dates were not affected by POST application. Grain yield was reduced slightly (5 bu/A) where POST was applied to hybrid 3917; this difference was just significant at P=0.10. Grain yield of other hybrids were not affected by this herbicide. Grain moisture was generally not affected by postemergence application of POST, although there was a slight trend for lower grain moisture where this treatment was applied compared to the check.