You are here

更高的温度和在麦草畏中添加草甘膦可以增加挥发性。

University of Tennessee research finds that glyphosate in the tank mix could be why off-target movement has occurred in some cases in recent years.


生活在麦草畏仍能在这个生长季节使用的州的农民应该意识到,更高的温度和草甘膦与麦草畏的混合会导致麦草畏的大气浓度增加。

That's what Tom Muller and Larry Steckel,University of Tennessee weed scientists,found when they examined dicamba measurements following an application to soil inside a humidome.

The dicamba formulations examined were diglycolamine (Clarity) and diglycolamine + VaporGrip (XtendiMax).两种制剂均作为草甘膦(Roundup Powermax)的混合物使用。Xtendimax也单独应用。Applications were made across a range of temperatures and monitored for 60 hours.然后,研究人员使用空气采样器从腐殖质圆顶的大气中收集麦草畏。

As expected,随着温度的升高,科学家们在腐殖质中发现了更多的麦草畏。当温度超过85华氏度时,最大的增益出现。结果还表明,在整个温度范围内,adding glyphosate to dicamba formulations increased detectable dicamba air concentrations by three to nine times compared with dicamba alone.

“更高温度下的dicamba检测结果与以前的发现一致,此外,6月底和7月底,越来越多的人抱怨麦卡巴受伤。"That glyphosate is a contributor to dicamba volatility is not as widely accepted,but our data shows the addition of glyphosate to a dicamba spray solution increased dicamba detection in the atmosphere which would point to increased volatilization."

增加对麦草畏检测的最合理解释是草甘膦降低了溶液的酸碱度。这导致更多的麦草畏呈酸性形式,这会增加迪卡巴的波动性,穆勒说。随着波动性的增加,除草剂偏离目标移动的可能性增加,对不耐除草剂的植物造成伤害,他说。

麦草畏预混料

Many products containing glyphosate are presently approved to be mixed with dicamba before spray applications.将除草剂与不同的作用方式相结合是作物生产者控制更广泛杂草种类的一种常见做法。However,根据穆勒和史泰克的研究,UT weed experts are discouraging the addition of glyphosate to XtendiMax,以及其他低挥发性的迪卡巴配方,恩格尼亚,费沙潘,和Tavium。

"Based on this research,we believe glyphosate in the tank mix could be a culprit in why we're seeing some of the drift in fields these past three years," says Steckel.


偏离目标移动

自从2017年批准了这种除草剂的新用途和扩大用途以来,麦草漂移一直是农业界关注的热点问题。偏离目标的迪坎巴运动,通过物理漂移或波动发生的,has been blamed for the damage of millions of acres of crops,trees,和观赏植物。

To decrease the potential for dicamba drift through volatilization,几个州已经实施了迪卡巴喷洒截止日期,以对应于温度持续上升到85°F以上的一年的时间。例如,明尼苏达州的农民不再能合法地使用专为耐麦草畏大豆设计的麦草畏配方,由于该州6月20日的停职。

在伊利诺伊州,尽管如此,今年春天肆虐的降雨促使监管者将该州的迪坎巴的最后期限延长到7月15日。

目前在田纳西没有喷雾截止日期,尽管UT杂草科学家建议不要喷洒麦草畏,甚至是低浓度的麦草畏制剂,当温度超过85磅时,同样的科学家也建议将草甘膦从麦草畏喷雾剂中提取出来。

"Glyphosate is an 必威app手机下载版important herbicide with many uses.尽管抗草甘膦杂草不断进化,farmers would be lost without glyphosate,因为它仍然为许多麻烦的杂草物种提供了极好的和经济的控制,”Steckel说。“这些数据表明,它不属于与迪坎巴混合的坦克。”

田纳西州大豆促进委员会部分资助了这项研究。More dicamba resources for Tennessee applicators can be found at the UTIA Dicamba Information site.

Read more about

Tip of the Day

Farmer-Designed Planter Wheel Storage

Planter wheel storage 当封闭轮或仿形轮中的轴承移动时,我在五分钟内把坏掉的车轮换成新的,然后在……中更换轴承。read more

Crop Talk