Canola Herbicide Trial, Carrington, 2000.
experiment was conducted on a minimum-till field with a Heimdahl-Emrick loam
soil with 6.2 pH and 3.3% organic matter at the NDSU Carrington Research
Extension Center. The experimental design was a randomized complete block with
three replicates. Herbicide treatments were applied to 5 by 25 ft plots with a
hand-boom plot sprayer. The PPI treatment was applied at 18.4 gal/A at 35 psi
through 8002 flat fan nozzles on May 1 with 68 F, 24% RH, 90% clear sky, and 8
mph wind on a dry soil surface and incorporated with a roto-tiller at a 3- to
4-inch depth. ‘Hyola 357RR‘ canola was planted at 700,000 PLS/A on May 3 in
7-inch rows at a 0.5- to 1-inch depth.
POST treatments were applied at 9.2 gal/A at 35 psi through 8001 flat fan
nozzles. POSTA treatments were applied on May 25 with 57 F, 55% RH, clear sky,
and 9 mph wind to 1- to 2-leaf canola, 1- to 2-inch tall yellow and green
foxtail, 1- to 5-inch tall common lambsquarters, 0.5-inch tall redroot and
prostrate pigweed, and 1.5- to 4-inch tall wild buckwheat. POSTB treatments were
applied on June 2 with 50 F, 77% RH, clear sky, and 8 mph wind to 3- to 4-leaf
canola, 3- to 4-leaf foxtail, 1- to 5-inch tall common lambsquarters, 4- to
6-inch tall horseweed, 0.5- to 1-inch tall pigweed, and 2- to 6-inch tall wild
buckwheat. POSTC treatments were applied on June 8 with 66 F, 69% RH, 80% cloudy
sky, and 11 mph wind to 5- to 6-leaf canola, 5- to 6-leaf foxtail, 1- to 9-inch
tall common lambsquarters, <12-inch tall horseweed, 1- to 2-inch tall
pigweed, and 6- to 12-inch vine wild buckwheat. The trial was harvested with a
plot combine on August 15.
and yellow foxtail, horseweed, and redroot and prostrate pigweed control was >
90% with glyphosate at 0.38 lb/A among application timings . Common
lambsquarters control with trifluralin was less than with POST treatments on
July 31. Common
lambsquarters control was highest (96-99%) with glyphosate at 0.38 lb/A applied
22 or 30 days after planting compared to the late application. Wild buckwheat
control on July 31 was highest (95-96%) with sequential applications of
glyphosate at 0.560/0.375 and 0.560/0.560 lb/A. Canola injury was not detected
with any treatment. Although not statistically significant, canola yield tended
to improve with herbicide treatments compared to the untreated check.