The paper studied the effects of silicon fertilizer(Na2SiO3) on the activities of superoxide(SOD),catalase(CAT),peroxidase(POD) and on Malondialdehyde(MDA) content in cucumber leave under salt stress soil with pot experiment.The results showed that with input of silicon fertilizer,the activities of SOD,CAT,POD increased distinctly,while the content of MDA decreased distinctly.With the input of silicon fertilizer increasing,the activities of SOD,CAT,POD increased first and then decreased,while the content of...