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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Relating Field Dissipation and Laboratory Studies through Modeling: Chlorothalonil Dissipation after Multiple Applications in Peanuts
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Relating Field Dissipation and Laboratory Studies through Modeling: Chlorothalonil Dissipation after Multiple Applications in Peanuts

机译：通过建模将田间耗散与实验室研究联系起来：花生中多次施用后氯噻酮的耗散

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摘要

A computer simulation model can provide useful environmental risk information for pesticides based on rather limited field and laboratory data, if that data provides calibration of the model for the critical processes controlling dissipation. We used the USDA-Agricultural Research Service Root Zone Water Quality Model (RZWQM) to estimate leachate and runoff of chlorothalonil fungicide and its soil degradates during a growing season in which a total of seven applications were made at intervals of 14 days to peanut plants. RZWQM provides detailed algorithms to describe broadcast pesticide application to a combined foliage/soil target, dissipation within both targets, and movement in runoff and leachate water as a function of weather and soil moisture. The model provides an integrated analysis showing how initial partitioning of chlorothalonil between foliage and soil, washoff from foliage to soil, and degradation on the foliage and soil surface (actually the top cm of soil) limit the potential of the parent chlorothalonil and its degradates to leach. However, the model indicates that under severe rainfall conditions during the application period, significant quantities of the parent compound may be transported by runoff into water sources.
机译：如果计算机模拟模型的数据为控制耗散的关键过程提供了模型的校准，则计算机模拟模型可以基于相当有限的田间和实验室数据为农药提供有用的环境风险信息。我们使用了美国农业部农业研究服务部根区水质模型（RZWQM）来估算百菌清杀真菌剂的渗滤液和径流以及其在生长季节的土壤降解情况，在该生长季节中，每隔14天对花生植物进行了7次施用。 RZWQM提供了详细的算法，以描述广播农药对组合的叶面/土壤目标的施用，两个目标内的消散以及径流和沥滤液中水的运动随天气和土壤湿度的变化。该模型提供了一个综合分析，显示了百菌清在叶片和土壤之间的初始分配，从叶片到土壤的冲刷以及在叶片和土壤表面（实际上是土壤的顶部厘米）上的降解如何限制了百菌清的潜在潜能及其降解为浸出。但是，该模型表明，在施用期间的强降雨条件下，大量母体化合物可能会通过径流运输到水源中。

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