玉米对乙草胺的敏感性研究

Sensibility of Maize Cultivars to Acetochlor

采用营养钵蛭石水培法 ,测定了乙草胺对不同玉米杂交品种及自交系幼苗芽和根鲜重的影响和农大 10 8玉米在不同萌动期对乙草胺的敏感性差异。结果表明 ,在多剂量给药的情况下 ,不同玉米品种对乙草胺的敏感性不同 ;同一品种芽和根的敏感性亦不同。回归分析结果表明 ,玉米幼苗芽和根的鲜重抑制率与乙草胺药液浓度的自然对数值呈直线相关 ,利用Finney机率分析法求出了各玉米品种的抑制率回归式和 L C50 值等。玉米种子在萌动期接触药剂越早 ,玉米生长受抑制程度越大 ,药害越重 ,且玉米芽长和芽重受喷药时期变化的影响较大 ,根长和根重受影响较小 ;乙草胺药害对玉米须根的生长影响较大 ,药害越重 。

Sensibility of 18 maize cultivars to acetochlor in seedling stage and the changes of sensibility of Nongda 108 cultivar in different seedling stage was studied by pot cultivation method. The results showed that sensibility of maize to acetochlor was different among the cultivars, and the sensibility of chit was different from root . The regression analysis showed that the weight inhibiting of chit and root had linear relation with the log of the acetochlor dosages. The inhibiting regression equation and LC 50 of chit and root weight were gained by the method of Finney. The sequence of sensibility expressed by chit fresh weight inhibition rate as follows: Yedan13>Yedan12>Lunuo6>Yedan22>Denghai1>Ludan981>Yedan4>Xiyu3>478>Nongda 108>Luyu16>Huang C>Qi319>Luyu10>H21>Ludan50>Luyuandan14>Ludan92. The sequence of sensibility expressed by root fresh weight inhibition rate as follows: Qi319>478>Lunuo6> Denghai1 >H21>Huang C>Ludan981>Ludan92>Yedan12>Yedan22>Yedan4>Xiyu3>Luyu16> Ludan50 >Luyu10>Nongda108>Yedan13>Luyuandan14. In seeding stage of Nongda 108, the earlier contacted with acetochlor, the more growth of maize reduced was. And the chit of Nongda 108 was more sensibility to acetochlor than the root.