Abstract:

To select the improvement products suitable for different degrees salinized soil in Hetao irrigation area of Inner Mongolia, representative humic acid and new soil improvement materials were selected. By comparing and analyzing the effects of different improvement materials on total salt quantity, pH, organic matter, CEC at the 0-20 cm soil depth after harvesting, as well as the effects on sunflower plant height and yield, the optimal saline-alkali improvement materials were explored. The results showed that all the improvement materials improved physicochemical property of salinized soil. ‘Yibaijia’ soil conditioner had the advantage of improving mild and moderate saline soil. ‘Kejian’ soil remediation agent was suitable for different degrees of salinized soil. The improvement effect of humic acid on different degrees salinized soil was second to ‘Kejian’ and ‘Yibaijia’. According to the effect of different amendments on soil salinity index and sunflower yield, ‘Kejian’ and ‘Yibaijia’ were more suitable for saline-alkali land in Hetao area.

Key words: Hetao irrigation area, soil improvement products, salinized soil, physical and chemical properties, sunflower