采用营养液培养法研究了钾对铁毒的缓解作用 .结果表明 ,过多的 Fe2 +会使杂交稻根系、地上部干重、根长及株高显著降低 ,且这种现象甚至在 Fe2 +水平较低时也很明显 .过多的 Fe2 +极大影响杂交稻的形态和植株中氮、磷、钾的含量 .高钾的供应可减轻高 Fe2 +离子的负效应 ,适当的钾素供应还可以减少 Fe2 +从根系向地上部的运输 ,尤其是向上位叶的运输 ,并改善植物的营养状况 The effect of potassium on iron toxicity was studied by nutrient solution culture method.The results showed that too much Fe2 + could reduce the root, aboveground dry weight, root length and plant height of hybrid rice significantly, and even in the Fe2 + It is also obvious at low levels that too much Fe2 + greatly affects the morphology of hybrid rice and the content of nitrogen, phosphorus and potassium in plants.The supply of high potassium reduces the negative effect of high Fe2 + ions and the appropriate supply of potassium It is also possible to reduce the transport of Fe2 + from roots to aboveground parts, especially to upper leaves and to improve the nutritional status of plants