江苏省主要水稻品种对甲磺隆的敏感性研究

Research on Metsulfuron Soil Bioassay and Sensitivity of Rice Varieties to Metsulfuron Residues in Soil.

在用土培方法探索水稻土培生物测定条件的基础上，研究了甲磺隆残留对水稻秧苗根系生长的影响。结果表明，采用高沙土，添加法加入甲磺隆，培养时调节土壤含水量３５％左右，恒温培养６ｄ，将获得满意的甲磺隆残留土培生物测定结果；用此方法测得的江苏主要水稻品种对甲磺隆残留的敏感程度呈现：常规粳稻＞糯稻、杂交粳稻＞常规籼稻＞杂交籼稻之趋势；土壤中甲磺隆残留量达０５μｇ／ｋｇ对江苏大多数水稻品种秧苗根系生长有着强烈的抑制作用。

Using fluvo aquic sandy loam soil, adding metsulfuron into soil by diffusion, conserving water content of 35% and cultural temperature of 25℃±1℃, selecting sensitive Keng rice variety and measuring the rice length after six day′s culture could obtain better repeatation for metsulfuron soil bioassay. The residue of metsulfuron had harmful effect on rice seedling′s root growth for rendering rice root of the treatments shorter than that of the controls. The sensitivity of rice varieties to metsulfuron showed the following tendency: Conventional Keng rice (Japanica rice)>Glutionous rice and Hybrid Keng rice>Conventional Hsien rice (Indica rice)>Hybrid Hsien rice. The impact of soil metsulfuron residues on rice seedling′s length reached 0.01 significant level at 0.5μg/kg for almost all rice varieties being tested.