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为比较氰氟草酯和五氟磺草胺常规推荐剂量下对千金子、稗及马唐的毒力差异及最佳适宜用药时期,南京农业大学植物保护学院等单位研究人员采用整株生物测定法,测定了这3种杂草及其不同叶龄对这2种除草剂的敏感性。结果表明,3种杂草对氰氟草酯的敏感性依次为千金子、稗、马唐。1~8叶期的千金子均对氰氟草酯高度敏感;在氰氟草酯田间推荐剂量75g/hm(2有效成分,下同)下对1~6叶期稗的鲜质量抑制率均在90%以
In order to compare the toxicity of cyhalofop-methyl and penoxsulam at the conventional recommended doses to the different gold, barnyardgrass and crabgrass, and the optimal drug-suitable period, the researchers of Plant Protection College of Nanjing Agricultural University and other units adopted the whole plant bioassay Method, the three kinds of weeds and their different leaf ages of these two herbicides were measured. The results showed that the sensitivity of the three weeds to cyhalofop-butyl was asphyxial, barnyardgrass and crabgrass. In the first to the eighth leaf stage, all of the gold seeds were highly sensitive to Cyhalofop-butyl. The fresh weight inhibition rates of barnyardgrass at 1 ~ 6 leaf stage were the best at the recommended dose of 75g / hm (2 active ingredients) At 90%