助剂对氟磺胺草醚药液性状及除草活性的影响

以药液表面张力、黏度、叶片最大持留量和干燥时间等为评价指标,研究了Quad7、Scoil、非离子助进剂和晶富娃四种喷雾助剂的不同添加量对氟磺胺草醚药液物理性状的影响,并通过盆栽试验测定助剂对氟磺胺草醚除草活性的增效作用。结果表明,四种助剂都能够降低药液表面张力、提高黏度、延长干燥时间、增加药液的最大稳定持留量。但不同助剂对药液性状的影响存在差异,非离子助进剂和Quad7对药液表面张力的降低幅度较大,达到了24.55%和24.23%;Scoil和晶富娃对药液的黏度、最大持留量和干燥时间提高幅度高于其他助剂。四种助剂均可以增加氟磺胺草醚的除草活性,其中以助剂Scoil增效作用最大,其次为Quad7和非离子型助进剂,晶富娃的增效作用最小。同种助剂不同添加量对氟磺胺草醚的增效作用存在差异,1.0%(V/V)的Scoil、0.5%(V/V)的Quad7、0.25%(V/V)的非离子助进剂和1.0%(V/V)的晶富娃的增效作用分别为27.9%、25.2%、20.4%和13.3%。

Effect of adjuvants on characteristics and performence of formsafen

Surface tension,viscosity,maximum leaf retention and dry duration were measured to value effects of adjuvants including Quad7,Scoil,nonionic surfactant,Jingfuwa with different doses on physical characteristics of formsafen.Pot experiments were conducted to study the synergism of four adjuvants on herbicidal activity of fomesafen.The results showed that all of four adjuvants reduced the surface tension of the dilution,increased the viscosity and maximum leaf retention and dry duration of the dilution.Howerver,different adjuvants had different effects.The reductions on the surface tension of nonionic surfactant and Quad7 were 24.55% and 24.23%,more than that of other adjuvants.And Scoil and Jingfuwa had more improvements on the viscosity and maximum leaf retention and dry duration than that of nonionic surfactant and Quad7.All of four adjuvants had better synergism on herbicidal activity of fomesafen.The best synergism was Scoil.The synergism of Quad7,nonionic surfactant and Jingfuwa was less than that of Scoil.The same adjuvant had different synergism on fomesafen among different doses.The optimic dose of four adjuvants were 1.0%(V/ V) Scoil,0.5%(V/ V) Quad7,0.25%(V/ V) of the nonionic surfactant,and 1.0%(V/ V) Jingfuwa,which increased the weed control by 27.9%,25.2%,20.4%,and 13.3%,respectively.