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首页> 外文期刊>Weed Science: Journal of the Weed Science Society of America >Canada thistle (Cirsium arvense) suppression by Sudangrass interference and defoliation.
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Canada thistle (Cirsium arvense) suppression by Sudangrass interference and defoliation.

机译：苏丹草的干扰和脱叶抑制了加拿大蓟（Cirsium arvense ）。

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Canada thistle is difficult to manage in organic farming systems and others with reduced reliance on herbicides. Previous field studies found that defoliation or sudangrass interference suppressed Canada thistle. Our objective was to understand the factors causing suppression of Canada thistle observed in the field. Three greenhouse studies were conducted utilizing frequency of defoliation, sudangrass interference and defoliation, and interspecific phytotoxicity to discern mechanisms of Canada thistle suppression. Increased defoliation frequency (up to four defoliations) decreased Canada thistle shoot height, shoot and root mass, and root-to-shoot ratio. Plants with larger root mass had greater shoot mass and number (r=0.87 and 0.73, respectively), indicating a probable interdependence of root size (carbohydrate reserves), bud density, and subsequent shoot growth. In the sudangrass interference and defoliation study, Canada thistle shoot dry mass was 38.7, 2.76, and 0.39 g pot-1 in the defoliation only, sudangrass interference only, and defoliation+interference+surface mulch treatments, respectively. Sudangrass interference by itself was effective in suppressing thistle growth; combining interference with defoliation did not further reduce growth (2.76 and 2.83 g pot-1, respectively). In the experiment minimizing interspecific competition, we found no evidence of sudangrass having a phytotoxic effect on Canada thistle. Overall results indicate that sudangrass competition or frequent shoot removal suppresses growth of Canada thistle.Digital Object Identifier http://dx.doi.org/10.1614/WS-D-11-00145.1
机译：加拿大蓟很难在有机耕作系统和其他对除草剂的依赖中管理。先前的野外研究发现，落叶或苏丹草的干扰抑制了加拿大蓟。我们的目标是了解在田间观察到的抑制加拿大蓟的因素。利用脱叶频率，苏丹草干扰和脱叶以及种间植物毒性来进行三项温室研究，以了解加拿大蓟抑制的机制。较高的脱叶频率（最多四个脱叶）会降低加拿大蓟的枝条高度，枝条和根的质量以及根与茎的比率。具有较大根质量的植物具有较高的芽质量和数量（分别为 r = 0.87和0.73），表明根大小（碳水化合物储备），芽密度和随后的芽生长可能相互依赖。在苏丹草干扰和落叶研究中，加拿大蓟茎干质量仅在落叶，仅苏丹草干扰和落叶+干扰+表面覆盖处理下分别为38.7 g，2.76和0.39 g pot -1 。 。苏丹草的干扰本身可以有效地抑制蓟的生长。干扰与脱叶相结合并没有进一步减少生长（分别为2.76和2.83 g pot -1 ）。在最小化种间竞争的实验中，我们没有发现苏丹草对加拿大蓟有植物毒性作用的证据。总体结果表明，苏丹草竞争或频繁去除芽抑制了加拿大蓟的生长。数字对象标识符http://dx.doi.org/10.1614/WS-D-11-00145.1

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