油菜叶片对多效唑的吸收及在体内和土壤中残留

采用同位素示踪技术研究油菜叶片对ＭＥＴ的吸收、运转及ＭＥＴ在油菜和土壤中的残留量。试验结果表明：叶面施用３Ｈ－ＭＥＴ后１小时，吸收量即达施用量的４６．２６％，３小时为５２．５８％，此后随着施用时间的延长，吸收增加甚微，至４８小时为５４．２９％．叶片吸收的３Ｈ－ＭＥＴ基本上滞留于处理部位，占吸收量的９９％左右，向植株其它部位输出极少。３Ｈ－ＭＥＴ在油菜中的残留量为０．０２４－０．１０７ｐｐｍ，根＞叶＞籽＞粒＞茎＞荚壳。在土壤中的残留为０．０１０—０．０１５ｐｐｍ，表土＞深层土。

THE UPTAKE OF MET IN LEAF AND ITS RESIDUE IN RAPE PLANT AND SOIL

Through using techniques of isotope tracer.the uptake of3H-MET in rape leaves and its residue in plant and soil were studied. Absorption of 3H-MET by leaf occurred within three hours after application. At one and three hours after application,the amount of3H-MET absorbed was 46. 26% and 52. 49% of the applied amount, respectively. At 48 hours after application. the absorbed amount was 54. 29 %. About 99 % of 3H-MET'absorbed was confined to the treated leaf,and only a small portion was transported to other parts of the plant. The order of residue of 3H-MET in rape plant is: root>leaves>secds>stem> hull. They were 0. 017. 0.070. 0.039, 0.034 and 0.024ppm respectively. The residual amount was 0. 015 .and 0.010 ppm in 0-5cm and 5-10cm depth of soil, respectively.