【摘要】 1978、1979两年用¹4C—多菌灵（MBC）处理盆钵土壤研究棉花根系的内吸性,每盆用¹⁴C—MBC 为4400微克。研究结果用方差分析表明:棉花生长初期的内吸量与土壤深度影响明显,10cm 深度¹⁴C—MRC 被植株吸收量最多,5cm 次之,15cm 最少。在中、后期内吸量受深度影响不明显,但由根系吸收、转移到地上部各器官的分配量有明显的差异,内吸量的 分配是叶>茎>根>铃>蕾。从叶片提取液经分离、纯化,再用薄板层析法分析¹⁴C—MBC,发现主要是多菌灵,但有微量降解。棉花内吸土壤中¹⁴C—MBC 的百分率很低,从铃期测得结果表明,其内吸量占施入量的0.17—0.25%,而茎器官更低,仅占0.1%。所以,我们认为用多菌灵处理土壤防治维管束病害（棉花枯萎病）的可能性需深入研究。更多还原

【Abstract】 The systemic activity of¹⁴C-MBC was studied in cotton plant grown in thesoil of the pots treated with¹⁴C-MBC（1978-1979）.Each pot was treated with¹⁴C-MBC at the amount of 4400 μg.The result was shown by analysis of variancesthat the systemic amount in the preceding stage of cotton was signiticantly intlu-enced by the depth of the soil.The comparative degree of the quantity of Label-led-MBC absorbed by the plant in relation with the depth of the soil was 10 cm,5cm and 15cm respectively.While in the median and late stages of cotton thecorrelation between the systemic amount and the depth of the soil were notstatistically significant.However,the amount uptaken and transfered by the cot-ton-root to the different overground organs were not alike obviously.The distribu-tion of them was as fouows:leaf>stem>root>boil>bud.The ¹⁴C-MBC was isolated and purified from the leaf tissue extract and wasanalysed with the thin layer chromatography（TLC）.The predominant composi-ting of the systemic substance was MBC,which was scarcely degradated.The percentage of ¹⁴C-MBC in the soil uptaken by the cotton was very low.The result indicated that in the stage of boll each plant absorbed only 0.17-0.25%of the total application,while the systemic amount ot the stem was lowest andwas 0.1% of the boiling stage.We suggest that soil treated with MBC tor con-trol of vascular disease（Fusarium oxysporum f.vasinfeetum）must be further in-vestigated.更多还原