15%多效唑可湿性粉剂在水稻上的降解研究

应用气相色谱检测技术,研究了在自然条件下,多效唑15%可湿性粉剂在水稻土壤和水稻植株中的降解规律,建立了一种新的、稳定性好且适合我国目前大多数实验室应用的水环境中多效唑残留量的GC检测方法。结果表明,多效唑在湖南和天津两地稻田水中的半衰期分别为5.55、8.88d;在稻田土壤中分别为15.75、15.13d;在水稻植株中分别为2.93、2.36d;多效唑在稻田水、稻田土和水稻植株中的降解规律均符合一级化学反应动力学降解方程。多效唑在水稻上的降解和两地的气候、降雨、土壤性质、土壤微生物、光照以及温度有关,按照推荐剂量施用多效唑,收获的稻米是安全的。

Degradation of 15% Paclobutrazol in the Paddy Field

The degradation rules and residual of paclobutrazol in the paddy field in natural condition were studied by using GC. A new GC detection method with high stability was established,and at present,which can meet the requirement for the majority of laboratory studies on the residual of paclobutrazol in the water in China. The half-lives of paclobutrazol in the paddy field water were 5.55 and 8.88 days respectively in Hunan and Tianjin,while,they were 15.75 and 15.13 days in the paddy soil. The degradation rules of paclobutrazol in the paddy water,the paddy soil and the seedlings followed the first order chemical reactions dynamics equation. The degradation of paclobutrazol related to weather,the climate,rainfall,physical and chemical characteristics of soil,soil microbes,illumination as well as the temperature of two places. Based on the field experiment,the harvested paddy rice was safe when the recommended dosage of paclobutrazol was used.