摘要
[Objective] The aim was to explore the factors affecting the herbicidal activity of pyrazosulfuron-ethyl against Sagittaria pygmaea in paddy soil.[Method] The bioassay method was carried out under greenhouse conditions.[Result] The reduction of more than 80% in fresh weight was observed in S.pygmaea treated with 45 g/hm2 of pyrazosulfuron-ethyl for 7 d or more.Application of 60 g/hm2 at the sprouting stage of S.pygmaea suppressed completely the growth in fresh weight irrespective of tuber size.However,at 6 g/hm2 growth of the weed sustained less reduction with increasing tuber size.Differences in flooding water depth and temperature had no appreciable influence on the herbicidal activity.Growth inhibition of S.pygmaea by pre-emergence or 1.5-leaf stage applications under non-leaching conditions was significantly higher than that under water leaching conditions.Under non-leaching condition,there was no remarkable difference in this inhibition between preemergence and 1.5-leaf stage applications,while under water leaching conditions the growth reduction with the latter application was significantly larger.Growth inhibition of S.pygmaea planted at a depth of 2 cm was significantly higher than that planted deeper （5 cm） with the pre-emergence applications.[Conclusion] This study had provide basis for the further study on the inhibition effect of pyrazosulfuron-ethyl.
[目的]探索吡嘧磺隆对矮慈菇抑制效果的影响因素。[方法]在温室内水稻土中进行生物测定。[结果]在1叶1心期施用有效成分45g/hm2,矮慈菇受药7天以上才可达到80%以上的鲜重抑制率;在萌芽期施用高剂量(60g/hm2),不论矮慈菇块茎大小均被完全抑制,当施用低剂量(6g/hm2)时,随着矮慈菇块茎的增大其抑制率逐步降低;灌水深度和施药后的温度对抑制效果影响不显著。在无渗漏有水层状态时,萌芽期与芽后施药矮慈菇的抑制率差异不显著,而在渗漏无水层状态下,芽后用药的抑制率要显著大于前者;芽前用药,较浅土层下(2cm)的矮慈菇抑制率明显较高。[结论]为进一步研究吡嘧磺隆的抑制效果提供依据。
基金
Supported by the Science and Technology Innovation Platform Construction Project of Institution of Higher Education in Hunan Province(XCJZ2009-070)
the Earmarked Fund for Mordern Agro-industry Technology Research System(CARS-19-E12)~~
