Weed management during spring crop production in eastern Washington presents many challenges. Many spring crops are weak competitors with weeds. In May of 2010 and 2011, two spring crop trials were initiated near Pullman, WA, to compare the relative competitiveness of barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), lentil (Lens culinaris Medik.), and pea (Pisum sativum L.) using cultivated oat (Avena sativa L.) as a surrogate for wild oat (Avena fatua L.) competition. The experiment was arranged as a split-block split-plot design with four replications. One set of main plots included three oat density treatments (0, 63, and 127 plants m−2), while a second set included each crop species. Crop species main plots were then split into subplots of two different seeding rates (recommended and doubled). Crop populations decreased as oat density increased and increased as crop seeding rate increased. As oat density increased, preharvest crop biomass decreased for all crops, while oat biomass and yield increased. Oat biomass and yield were greater in legume plots compared with cereal plots. Increasing oat density decreased yields for all crops, whereas doubling crop seeding rate increased yields for barley and wheat in 2010 and barley in 2011. Compared with legumes, cereals were taller, produced more biomass, and were more competitive with oat.

中文翻译：

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华盛顿东部旱地地中海气候中春季作物与燕麦竞争的生长发育

华盛顿东部春季作物生产期间的杂草管理提出了许多挑战。许多春季作物是杂草的弱竞争者。2010 年 5 月和 2011 年 5 月，在华盛顿州普尔曼附近启动了两次春季作物试验，以比较大麦的相对竞争力（大麦L.), 小麦 (小麦L.), 扁豆 (烹饪透镜Medik.) 和豌豆 (豌豆L.) 使用栽培燕麦 (燕麦L.) 作为野燕麦的替代品 (燕麦L.) 竞争。该实验被安排为具有四次重复的分块裂区设计。一组主要地块包括三个燕麦密度处理（0、63 和 127 株 m-2)，而第二组包括每种作物。然后将作物种类主地块分成两种不同播种率（推荐和加倍）的子地块。作物种群随着燕麦密度的增加而减少，随着作物播种率的增加而增加。随着燕麦密度的增加，所有作物的收获前作物生物量减少，而燕麦生物量和产量增加。与谷物地块相比，豆类地块的燕麦生物量和产量更高。增加燕麦密度会降低所有作物的产量，而将作物播种率提高一倍会提高 2010 年大麦和小麦以及 2011 年大麦的产量。与豆类相比，谷物更高，产生更多生物量，并且与燕麦相比更具竞争力。