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首页> 外文期刊>Journal of environmental science and health >Imazethapyr persistence in sandy loam detected using white mustard bioassay
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Imazethapyr persistence in sandy loam detected using white mustard bioassay

机译：用白芥末生物测定法检测了咪唑乙草在沙质壤土中的持久性

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摘要

Field experiments were conducted during two years at Srem region to investigate the influence of meteorological conditions, time and rate of application on soil persistence of imazethapyr in sandy loam type of soil. Imazethapyr was applied PRE- and POST-EM and in both cases in three application rates: 80, 120 and 160 g a.i./ha. Soil samples were collected from the day of herbicide application in predetermined intervals up to one year after application and residual concentrations were determined with a white mustard root bioassay. Imazetapyr persistence was significantly influenced by meteorological conditions with average half-life being 6 days longer in season with lower precipitation level. Time of application induced slower imazethapyr dissipation resulting in higher average t_(1/2) (seven and nine days in first and second year of examination, respectively). Application rates had no consistent effect on imazethapyr persistence. Imazethapyr residue level one year after application caused no visible injuries on white mustard shoots, while root growth reduction ranged from 4.6 to 27.7%. Obtained residue levels were further compared with known data on crop sensitivity in order to assess possibility of crop injuries one vear after imazethaDvr aDDlication.
机译：在Srem地区进行了为期两年的田间试验，以调查气象条件，施药时间和施肥速率对砂壤土型咪草乙烟土壤持久性的影响。依马西吡在PRE-EM和POST-EM两种情况下均以三种施用量施用：80、120和160 g a.i./ha。从除草剂施用之日起至施用后一年内的预定间隔收集土壤样品，并用白芥末根生物测定法测定残留浓度。气象条件对Imazetapyr的持久性有显着影响，平均半衰期在季节长6天，而降水量较低。施用时间导致咪唑乙烟消散较慢，导致平均t_（1/2）升高（分别在检查的第一年和第二年分别为7天和9天）。施用量对咪唑乙烟碱的持久性没有持续的影响。施用一年后，咪唑乙烟残留水平未对白芥菜芽造成明显伤害，而根部生长减少范围为4.6％至27.7％。将获得的残留水平进一步与已知的作物敏感性数据进行比较，以评估imazethaDvr扩增后一处作物对作物造成伤害的可能性。

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