关键词: 酸化土壤, 辽东南地区, 生石灰, pH, 玉米

Abstract: The study was conducted in the ways of the soil incubation and pot experiments to study the effects of lime on acid soil amelioration and maize plant growth in southeastern of Liaoning， and determine the suitable lime application rate. The soil incubation results showed， the soil pH increased after the application of lime， tended to be stable after 10 days of incubation. When the amount of lime was higher than 1.5 g per kg soil， soil pH was significantly increased. With the increase of lime application amount， the soil pH increased， lime application rate was positively correlated with soil pH and in a liner relationship y=0.442 8x+4.725 5（R²=0.955 7^***）. The pot experiment results showed， application of lime could significantly increase plant height， shoot and root dry matter； At the same time， root growth was promoted and root-shoot ratio was increased. When the dosage of lime was more than 1.0 g/kg soil， the height of maize seedlings and root-top ratio were significantly higher than those of control. When the amount of lime was more than 1.5 g/kg soli， the dry weight of aboveground was significantly higher than that of the control. In conclusion， the application of lime southeastern of Liaoning significantly increased soil pH， alleviated soil acidification and promoted the growth of maize seedlings. The lowest and highest application amount of lime was 1.52 g/kg soil and 2.42 g/kg soil， respectively.

Key words: acid soil, southeastern of Liaoning, lime, pH, maize