In the Southern Great Plains, producers of hard red winter wheat seek sustainable methods for controlling cheat and improving economic returns. Experiments were conducted at two sites in north-central Oklahoma to determine the effect of cheat management programs, with various weed control strategies, on cheat densities and total net returns. The cheat management programs, initiated following harvest of winter wheat, included conventionally tilled, double-crop grain sorghum (Sorghum bicolor L.) followed by soybean (Glycine max L.); and continuous winter wheat. Rotating out of winter wheat for one growing season increased yield of succedent wheat up to 32% and 42% at Billings and Ponca City, respectively. Dockage due to cheat in the succedent wheat was reduced up to 78% and 87% by rotating out of winter wheat for one growing season at Billings and Ponca City, respectively. Cheat management programs including a crop rotation with herbicides applied to the grain sorghum, except for an application of atrazine metolachlor at Ponca City, improved total net returns over the nontreated continuous wheat option. Cheat panicles in the succedent wheat were reduced up to 87% by rotation out of winter wheat for one growing season.
Nomenclature: Atrazine metolachlor; cheat, Bromus secalinus L. #3 BROSE; grain sorghum, Sorghum bicolor (L.) Moench ‘Pioneer 8500’, ‘Dekalb DK28E’; soybean, Glycine max (L.) Merr., ‘Dekalb CX367RR’; wheat, Triticum aestivum L. ‘2137’.
Additional index words: Economics, net returns, Oklahoma.
Abbreviations: Fb, followed by; NSD, no significant difference; OM, organic matter.
