Weed management systems in corn at Potsdam, MN in 2003

摘要

The objective of this trial was to evaluate weed managementsystems available to corn producers for control of several annual weed species in southeastern Minnesota. Theresearch site was a Port Byron silt loam containing 3.2% organic matter with a pH of 6.7 and soil test P and K levelsof 6 and 376 ppm, respectively. The previous crop was soybeans. The area was fertilized in the spring with 160 and120 lb/A of nitrogen and potassium, respectively. The field was disked followed by one pass with a field cultivator.Two corn hybrids were used to evaluate the products for weed control in this trial, Syngenta NK45-A6 and DeKalbDKC46-26. All corn was planted on May 20, 2003, at a depth of 1.5 inches in 30-inch rows at 32,000 seeds/A.Preemergence (PRE) and postemergence (POST I, II, and III) treatments were applied with a tractor-mountedsprayer delivering 20 gpa at 32 psi using 11002 TurboTee nozzle tips. Evaluations of plots were taken on June 16and July 3, 2003. Application dates, environmental conditions, crop and weed stages are listed below.