Tolerance to Preemergence Herbicides
The study was conducted on a Heimdal silt loam soil with a 7.5 pH and 2.7% organic matter. Flax (Cathay) was seeded on May 7th at 41 lbs/A. PRE herbicides were applied immediately after planting with 560 F air, 480 F soil, 60% relative humidity, 5% clouds, and no wind. The soil surface was dry to a depth of 0.75 inches. Treatments were applied to 8-by 25-ft plots with a hand-boom calibrated to deliver 20 gpa at 20 psi through XR8003 flat fan nozzles. The trial was harvest with a plot combine on August 24, 2000. The experimental design was a randomized complete block with three replicates.
evaluated were common lambsquarters, redroot pigweed, and prostrate pigweed.
Both sulfentrazone and flumioxazin provided excellent control of common
lambsquarters, redroot pigweed, and prostrate pigweed.
DPX-R6447 applied at 0.125 lb ia/A provided excellent common
lambsquarters and redroot pigweed control, but was weak on prostrate pigweed.
treatments, except the high rate of sulfentrazone and flumioxazin, had yields
greater than the untreated check.
Both the high rate of sulfentrazone and flumioxazin caused significant
crop injury and reduction in plant stand counts (Table).