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Cheat control in winter wheat

D.E. Peterson and W.B. Gordon
1994 NCWSS Research Report
An experiment was conducted near Belleville, KS on a Crete silt loam soil with 2.7% organic matter and a pH of 6.5 to evaluate several herbicide treatments for cheat control in winter wheat. Preplant incorporated treatments were applied and incorporated with a field cultivator operating 2- to 3-inches deep on September 30, 1993. ‘2163’ hard red winter wheat was seeded into a dry, cloddy seedbed with a double-disk drill, and preemergence treatments were applied to the soil surface on September 30. Precipitation totaled 0.32 inches within 2 weeks after wheat planting. Early postemergence treatments were applied to 2-leaf wheat and 1-leaf cheat on October 27 with 43 F, 51% relative humidity, and clear skies. Postemergence treatments were applied to 3-leaf wheat and 2-leaf cheat on November 22 with 58 F, 38% relative humidity, and mostly cloudy skies. All treatments were applied with a CO2 back-pack sprayer delivering 20 gpa at 25 psi through XR8002 flat fan spray tips to the center 6.3 ft of the 10- by 25-ft plots. The experiment had a randomized complete block design with three replications. Wheat injury and cheat control were evaluated April 15 and June 7. Wheat was harvested June 29.

Wheat stands were thin as a result of a poor seedbed and dry conditions at and following planting. Trifluralin caused more than 20% wheat stand reduction, which was critical considering the thin stand initially. Triallate caused chlorsulfuron&metsulfuron plus metribuzin increased cheat control, but also increased wheat injury, particularly when applied in 28% UAN carrier. Chlorsulfuron&metsulfuron generally provided more cheat control than comparable treatments with triasulfuron. Wheat yields generally related to cheat control and/or crop injury caused by the herbicide treatments.(Dept. of Agronomy, Kansas State University, Manhattan).