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Carrier Volume Affects Herbicide Activity in Simulated Spray Drift Studies

机译:载剂量影响模拟喷雾漂移研究中的除草剂活性

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Field studies were conducted to determine if varying carrier volume proportionally with herbicide dosage, thus maintaining constant herbicide concentration in the carrier, would change the response of sweet corn to glyphosate and of cotton to 2,4-D when compared with using a constant carrier volume where herbicide concentration would vary and be more dilute. For all the parameters measured, more sweet corn injury occurred if the concentration of glyphosate was constant in all volumes of spray. The glyphosate no-effect level for sweet corn was determined to be 0.046 kg/ha when using the variable carrier volume but was over four times greater (0.185 kg/ha) when applied at the constant carrier volume of 281 L/ha. Cotton response to 2,4-D was similar, with the constant herbicide concentration in the carrier at the lower volumes causing greater injury. The response of seed cotton yield was not different when comparing constant to variable carrier volume. The highly sensitive growth stage of cotton at the time of application (bud formation before blooming) may explain this result. These studies demonstrate the need to use carrier volumes that are proportional to the herbicide dosage, thus maintaining constant herbicide concentration in the carrier, when conducting simulated herbicide drift research. Failure to do so could underestimate the potential for injury.
机译:进行现场研究以确定与除草剂用量成正比地改变载体体积,从而保持载体中恒定的除草剂浓度,与使用恒定载体体积相比,是否会改变甜玉米对草甘膦的反应以及棉花对2,4-D的反应。除草剂浓度会发生变化并且会更稀的地方。对于所有测得的参数,如果在所有喷雾量中草甘膦的浓度恒定,则更多的甜玉米伤害发生。当使用可变载量时,甜玉米的草甘膦无效应水平确定为0.046 kg / ha,但当以281 L / ha的恒定载量施用时,草甘膦的无效应水平为四倍(0.185 kg / ha)。棉花对2,4-D的反应相似,载体中恒定浓度的除草剂在较低的体积下会造成更大的伤害。比较恒定体积和可变载体体积时,籽棉产量的响应没有差异。棉花在施用时的高度敏感的生长阶段(开花前形成芽)可以解释这一结果。这些研究表明,在进行模拟除草剂漂移研究时,需要使用与除草剂剂量成正比的载体体积,从而在载体中保持恒定的除草剂浓度。否则可能会低估潜在的伤害。

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