Weed control in flax

摘要

Plots were established at the Northeast Research Farm near Watertown, South Dakota in2003. The site had a Kranzburg silt loam soil with 3.0% organic matter and a pH of 6.1. The seedbedwas prepared in oat stubble using a fall chisel operation and a field cultivator prior to planting. Websterflax was seeded April 28, 2003 using 56 lb/A seed with a press drill having 6 inch row spacings.Herbicide treatments were arranged in a randomized complete block design with two replications of plots10 x 40 feet. Preplant herbicides were applied with a tractor-mounted compressed air sprayer equippedwith 8003LP flat fan nozzles spaced 20 inches; set at 20 psi to deliver 20 gpa. Incorporated treatmentswere incorporated immediately with two passes using a S-tine field cultivator. Postemergence treatmentswere applied with a bicycle plot sprayer using compressed air equipped with 8002 flat fan nozzles spaced20 inches set at 40 psi to deliver 20 gpa. Plots were visually evaluated for weed control. Yields weredetermined by harvesting a 5 by 35 foot area from the center of each plot using a plot combine.Application information and weather data are presented below.