Effects of different salts stress on seed germination and seedling growth of Trifolium repens

The experiment was conducted to study the germination rate,germination power,germination index,vigor index of Trifolium repens seeds treated with different concentrations solution of NaCl,Na2CO3,Na2SO4,mixed salt of NaCl and Na2CO3,mixed salt of NaCl,Na2CO3 and Na2SO4,there were three replicates for each treatment.With the increasing of salt concentration of NaCl,Na2CO3,mixed solution of NaCl and Na2CO3,germination rate,germination power,germination index,vigor index of T.repens seeds all decreased,the restrained degree on growth of root and seedling was increasing obviously,with the increasing of salt concentration of Na2SO4,mixed solution of NaCl,Na2CO3 and Na2SO4,germination rate,germination power,germination index,vigor index of T.repens seeds first increased and then decreased,the growth of root and seedling decreased.T.repens seeds tolerance threshold to NaCl,Na2CO3,Na2SO4 was 300 mmol/L,100 mmol/L,150 mmol/L respectively.