Recently, a new implement for controlling weeds in cereals (CombCut) has been developed. It cuts weeds in growing cereals without damaging them by using the physical differences (in height, stem thickness, straw stiffness and branching pattern) between crops and weeds. To evaluate and compare the effects of selective cutting with different timings of herbicide application on Cirsium arvense in spring barley, a randomised block experiment was conducted in Sweden in 2015–2017, in a field with a naturally occurring C. arvense population. Treatments consisted of control (C), herbicide application at 4–5‐leaf stage of C. arvense (H1), herbicide application at 8–10‐leaf stage (H2) and selective cutting at 10‐leaf stage (S). The treatments were performed in 2015 and repeated in 2016 in the same plots, and a final evaluation was performed in 2017. Compared to the control, S, H1 and H2 were equally efficient in reducing above‐ground biomass production of C. arvense and increasing spring barley grain yield per unit area. The number of C. arvense shoots per area was, however, higher in S compared to H1 and H2. No differences in control effects on shoot number were observed between H1 and H2. Our study indicates that (i) selective cutting (S) reduces C. arvense equally efficient as herbicide application and (ii) early herbicide spraying is as efficient as spraying later in the season.

中文翻译：

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除草剂选择时期和施药时间对春大麦Ci生长发育的影响

最近，开发了一种用于控制谷物杂草的新工具（CombCut）。通过利用作物和杂草之间的物理差异（高度，茎粗，秸秆刚度和分支模式），它可以在谷物生长过程中除杂草，而不会对其造成损害。为了评估和比较不同时间施用除草剂的选择性切割对春bar米抗rs藜的影响，2015-2017年在瑞典进行了一个随机试验，实验对象是自然存在的抗。藜种群。处理包括对照（C），在顽固梭菌的4-5叶阶段施用除草剂（H1），在8-10片叶阶段施用除草剂（H2），在10片叶阶段施用选择性除草剂（S）。该处理于2015年进行，并于2016年在同一地块重复进行，并于2017年进行了最终评估。与对照相比，S，H1和H2在减少地衣念珠菌的地上生物量生产和增加方面同样有效。春季大麦籽粒单产。但是，与H1和H2相比，S地区的C. arvense芽的数量更高。在H1和H2之间未观察到控制对芽数的差异。我们的研究表明（i）选择性割除（S）可以降低C. arvense与施用除草剂同样有效，并且（ii）早期除草剂喷洒与本季节后期的喷洒一样有效。