除草剂助剂对药液物理性状及对磺草酮药效的影响

为了探讨除草剂助剂对药液物理性状的影响与其对除草剂药效影响之间的关系,室内分别采用滴重法、接触角仪测定法、液滴干燥法、紫外分光光度仪测定法测定了4种常用除草剂助剂药笑宝、885、机油乳剂(机油标号N32)和信德宝药液的表面张力、接触角、干燥时间以及在叶面上的滞留量,以温室盆栽法测定了这些助剂对磺草酮防除反枝苋、稗草的药效增强作用。结果表明,药笑宝可显著降低药液的表面张力、减小接触角、缩短液滴干燥时间以及增大药液在叶面上的滞留量,其次是885助剂,而机油乳剂、信德宝效果略差。温室测定结果表明,药笑宝对磺草酮药效的增强作用最大,其次是885。说明助剂所致上述物理性状的变化与对磺草酮药效的增强呈现一定的相关性。

The Effect of Herbicide Adjuvants on the Physical Characteristics and the Bioactivity of Sulcotrione

In order to investigate the relationship between the effect of adjuvants on herbicide solution and their effect on herbicide bioactivity, the physical characteristics of four herbicide adjuvants including Yaoxiaobao, 885, Oil emulsion (N32), Synertrol were measured indoors. The physical characteristics were measured included surface (tension,) contact angle, dry duration and leaf retention. The methods used were dripping method, contact (angle) instrument mensuration, drying drop method and ultraviolet spectroscopy instrument (mensuration)respectively. The enhancement effect of these adjuvants on sulcotrione controling (Amaranthus) retroflexus and Echinochloa crus-galli was also measured using pot-planting method in greenhouse. The result showed that Yaoxiaobao could evidently reduced surface tension, (decreased) contact (angle,) reduced dry duration and augmented leaf retention, 885 was a little worse, Oil emulsion and Synertrol were worst. The measurement in greenhouse showed that Yaoxiaobao had the best enhencement effect on sulcotrione, 885 took second place. This showed that there is some (relationships) between the change of physical characteristics in spraying liquid and the (enhancement) effect on sulcotrione.