Abstract: Amelioration experiment on soda salinized soil in north plain of Liaohe River shows that after applying peat, maize yields was 2500～4400kg·hm^-2 on soda grassy marsh salt soil, and 5500～6800kg·hm^-2 on intensified soda alkalized grassy marsh soil, with the increasing rates of 40～144% and 127～181%, respectively.In second year, the yield of the latter was 6200～8000kg·hm^-2, with an increasing rae of 69～118%.Correspondingly, the soil profile, especially its plough layer, obviously shows desalination and decreasing of pHvalue and alkalinity; and the contents of soil organic matter, total nitrogen and total phosphorus were generally increased.

Key words: Liaohe River, Plain, Peat, Soil amelioration, Salinized soil