| 模拟降雨对茶树上几种化学农药残留性的影响(英文) |
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| 引用本文： | 夏会龙,万海滨,薛玉柱,王运浩,马慧群,陈宗懋.模拟降雨对茶树上几种化学农药残留性的影响(英文)[J].茶叶科学,1989(2). |
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| 作者姓名： | 夏会龙 万海滨 薛玉柱 王运浩 马慧群 陈宗懋 |
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| 作者单位： | 中国农业科学院茶叶研究所 杭州
(夏会龙，万海滨，薛玉柱，王运浩，马慧群)，中国农业科学院茶叶研究所 杭州(陈宗懋) |
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| 摘 要： | 本研究选择5种不同水溶解度的农药(敌敌畏、喹硫磷、乐果、马拉硫磷、氯氰菊酯),采用模拟降雨的方法进行雨水淋失实验,结果表明,雨水对茶树叶片上的农药淋失率与该农药的水溶解度有明显的相关性(r=O.885),水溶解度愈高的农药,雨水淋失率也愈高。此外,遇雨距喷药期的间隔时间愈长,雨水淋失作用愈小,而降雨量大小的影响相对较小。具内吸作用的农药(如乐果)除施药初期遇雨有一定影响外,其后的影响逐渐减小;非内吸性农药在施药后24小时内遇15毫米降雨时,其水溶解度每上升1ppm,雨水淋失率增加0.28％。文中还讨论了根据农药的水溶性、内吸性、降雨量和遇雨期进行分级及农药的雨水淋失率预测问题。
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Effect of Simulated Rain on Distribution of Pesticides on Tea Plant |
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| Abstract: | The effect of simulated rain on the distribution of 5 pesticides on tea plant was investigated,It was found that there was a significant relationship between rainfastness of a pesticide and its water solubility with a correlation coefficient of 0.885. The rainfastness increased by 0.28% with the increase of water solubility by 1 mg/L when 15 mm rain fallen after pesticide application within 24 h. In addtion, the interval between raining and pesticide application was another important factor; the longer the interval, the less the rainfastness showed. However,rain intensity only showed an insignificant effect on the rainfastness.Except for the initial stage after pesticide application (within 12 h),the effect of rain on systemic pesticides, such as dimethoate, was insignificant. With regard to nonsystemic pesticides, the influence of rainfall was greater, and this influence lasted untill the disapearance of a pestcide. According to the water solubility, systemic activity, rain amount, and interval of rainfall, the classification and prediction of pesticide rainfastness were discussed. |
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