Data from: Crop Sequence affects horseweed density and productivity in oats

Diversified crop rotations can provide many benefits that include greater yield stability, better nutrient cycling, and improved pest management. In a long-term experiment, we observed weed differences in oat that was the result of whether the previous crop was corn or grain sorghum. Horseweed, a common weed in North America, was more prevalent in oat when the previous crop was corn. We speculate that grain sorghum, considered to have allelopathic compounds, suppressed horseweed the following year better than corn. We show that crop sequence within diversified can result in distinct differences in weed presence and production.

多样化作物轮作（diversified crop rotations）可带来诸多益处，包括更高的产量稳定性、更优化的养分循环以及更高效的有害生物防控。在一项长期定位试验中，我们观测到燕麦田的杂草群落差异取决于前茬作物为玉米还是粒用高粱（grain sorghum）。北美常见杂草小飞蓬（Horseweed）在前茬为玉米的燕麦田中发生更为普遍。我们推测，被认为含有化感物质的粒用高粱（grain sorghum），相较于玉米，能在次年更好地抑制小飞蓬的滋生。本研究表明，在多样化作物轮作体系中，作物茬口序列会对杂草发生情况与作物产量造成显著差异。