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首页> 外文会议>British Crop Protection Council International Congress of the Crop Science and Technology >Duration of yellow nutsedge (Cyperus esculentus) competitiveness after treatment with various herbicides.
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Duration of yellow nutsedge (Cyperus esculentus) competitiveness after treatment with various herbicides.

机译：用各种除草剂治疗后黄芪（Cypetus esculentus）竞争力的持续时间。

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Experiments were initiated to determine the amount of time required for POST herbicides to render yellow nutsedge physiologically non-competitive. The rate of net CO_2 assimilation (A_N) was chosen as the response variable to describe competitiveness.When A_n of treated plants declined below 50% (A_(nso)) of the untreated control, the plants were no longer considered competitive. The time to reach A_(nso) for halosulfuron, imazapic, glyphosate and MSMA were 2.6, 3.1, 4.2, and 4.3 days, respectively.An A^so value was not calculated for bentazon since A_N rapidly decreased below 50%, but recovered to >50% by 10 DAT. Stomatal conductance (g_s), a measure highly correlated with transpiration, declined similarly with A_N over time for halosulfuron, imazapic, and glyphosate treatments. However, stomatal conductance rates for MSMA treated plants was near 95% of the untreated control while A_N was near 35% 12 DAT. MSMA reduced carbon assimilation one day after treatment and by 5 days after treatment, respiration exceeded carbon assimilation during the photoperiod for MSMA. MSMA rapidly and completely eliminated carbon assimilation, but had almost no effect on plant water use. Halosulfuron and MSMA reduced shoot regrowth to between 0 and 5% of the control. Mesotrione treatment allowed some 58% regrowth. In the field, these three treatments would likely have both quantitatively and qualitatively different effects on the competitive ability of yellow nutsedge.
机译：启动实验以确定后除草剂在生理上不竞争的黄色Nutsedge呈现黄芪的时间所需的时间。选择净CO_2同化（A_N）的速率作为描述竞争力的响应变量。当治疗植物的A_N低于未处理对照的50％（A_（NSO））时，植物不再被认为是竞争力的。卤血清，浸润性，草甘膦和MSMA的A_（NSO）分别为2.6,3.1,4.2和4.3天。AN ^ SO值未计算出Bentazon，因为A_N迅速下降至50％，但恢复到> 50％到10日。气孔电导（G_S），与蒸腾率高度相关的测量，随着卤咯磺酰化和草甘膦治疗的时间随着时间的推移而与A_N高度相关。然而，MSMA处理植物的气孔电导率接近95％的未处理控制，而A_N接近35％的DAT。 MSMA减少治疗后的一天和治疗后5天减少碳同化，呼吸在MSMA的光周期期间超过碳同化。 MSMA迅速，完全消除碳同化，但对植物用水几乎没有影响。霍血素和MSMA减少了拍摄再生至0％至5％的对照。 Mesotrione治疗允许约58％的再生。在该领域，这三种治疗可能对黄色Nutsedge的竞争力的能力来说可能具有定量和定性不同的影响。

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