The Schiff base of O-ethylthonophosphoryl-dihydrazine with salicylaldehyde and its Ni(II), Cu(II), Zn(II) complexes was synthesized. All the compounds were characterized by elemental analysis, IR, UV/vis, and molar eletroconductivity measurement. And the Schiff base ligand was characterized by 1H NMR and MS. The influences on cell survival rate and the activity of POD in rice sprouts of the compounds were determined, and the result showed that all the compounds c...