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Bruce Burdick
1109 S. Birch St.
Albany, MO 64402
660-726-5610
Email:
BurdickB@missouri.edu
Hundley-Whaley Center phone
660-726-3698
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February, 1999
Weed Control in Roundup Ready Field Corn
by Donald E. Null, Regional Agronomy Specialist
University Outreach and Extension, NW Region
Objective: To compare weed control provided by Roundup on
Roundup Ready corn to conventional weed control treatments and to
assess various weed control programs using Roundup.
Methods: DeKalb DK EXP363RR was planted into a conventionally
prepared seedbed on May 19. Pre-emergence applications were made
on May 19 following planting. Post applications were made on June
4 to 2-4" weeds; on June 17 to 12-18" tall corn; and/or on June 19
to weeds that had regrown to 2-4" after the June 4 applications.
Plots were harvested on October 3.
The treatments were replicated three times.
Weed pressure in the plot area was moderate to heavy and
consisted of giant foxtail, sunflower, cocklebur, velvetleaf and
common waterhemp.
Results: Figure 15 below illustrates the weed control
from two of the Roundup treatments compared to two standards.
The first standard, a pre-emergence Bicep II @4.9 pt/acre,
provided acceptable control of all weeds except cocklebur. The
Basis Gold @0.87 lbs/acre treatment was applied on June 4, and it
performed very well in this study. The Roundup @1 qt/acre
treatment applied on June 4 provided excellent initial weed
control but the lack of residual allowed new flushes of cocklebur
and common waterhemp to re-establish. The "two-shot" Roundup
application of Roundup consisted of a June 4 Roundup @2 pt/acre
and a June 19 Roundup @1.5 pint/acre. It provided the best
overall weed control in the study (97%). It also provided the
highest corn yield in the study. Corn yields for the four
treatments were statistically insignificant. Actual yields for
the treatments were 168 bu/acre for the Bicep II; 184 bu/acre for
the Basis Gold; 165 bu/acre for the single Roundup; and 186 bu/acre
for the "two-shot" Roundup treatment.
No adverse crop response was apparent from any treatment.
Figure 1 Study C8MO0817
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