1. Five Cool-Season Annual Grass Weeds Reduce Hard Red Winter Wheat Grain Yield and Price
- Author
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Case R. Medlin, Don S. Murray, and Brandon J. Fast
- Subjects
0106 biological sciences ,Crop yield ,Winter wheat ,04 agricultural and veterinary sciences ,Plant Science ,Biology ,Total price ,01 natural sciences ,010602 entomology ,Agronomy ,Yield (wine) ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Maximum density ,Grain yield ,Cool season ,Weed ,Agronomy and Crop Science - Abstract
Field experiments were conducted in Oklahoma to quantify the wheat grain yield losses and price discounts resulting from season-long interference with cheat, feral rye, Italian ryegrass, jointed goatgrass, and wild oat. Plots were seeded to individual weeds at one of seven seeding rates, and wheat was planted in all plots at a uniform rate. Maximum weed densities were 89 (cheat), 80 (feral rye), 158 (Italian ryegrass), 170 (jointed goatgrass), and 120 plants/m2(wild oat). Wheat grain yield losses caused by interference from the maximum density of each weed species were 19 (cheat), 55 (feral rye), 20 (Italian ryegrass), 21 (jointed goatgrass), and 28% (wild oat). Wheat grain total price discounts caused by interference from the maximum density of each weed species were 22 (cheat), 368 (feral rye), 26 (Italian ryegrass), 36 (jointed goatgrass), and 64 cents/hectoliter (wild oat). Of the five weed species included in this research, interference from feral rye had the greatest effect on wheat grain yield and price.
- Published
- 2009