镁对大豆根系活力叶绿素含量和膜透性的影响

采用水培试验和土培试验相结合的方法，研究了不同的镁营养水平下3个大豆品种(浙春2号、浙春3号和9703)在两个生育期(五叶期和盛花期)根系活力、叶片叶绿素含量和质膜透性的变化。结果表明，在缺镁胁迫下，大豆根系活力和叶绿素含量显著降低，质膜透性明显升高；适量施镁则能有效提高大豆根系活力和叶绿素含量，并大幅度降低质膜透性。3个大豆品种中，浙春3号对镁最为敏感。

Effect of Magnesium(Mg) on Root Activity,Chlorophyll Content and Membrane Permeability of Soybean

In these experiments, three varieties of soybean were employed as the main material, with the method of water cultural and soil cultural experiments to study the effect of Mg on root activity, chlorophyll content and membrane permeability of three cultivars of soybean. The results showed that the control plants under low Mg exhibited a significant decrease in root activity, chlorophyll content but an obvious increase in membrane permeability. Application of proper Mg raised effectively the root activity and the contents of chlorophyll, while the membrane permeability decreased obviously. ZhechunNO.3 soybean is most sensitive to Mg.