Abstract: The large area and wide distribution of saline soil in China seriously affects the crop yields. In order to utilize the saline soil reasonably and improve the yield and quality of maize, the four kinds of NaCl concentrations were selected, two maize varieties were planted, and it was divided into five sampling periods, then the variation rules of Na⁺, Cl^-, conductivity and pH value in soil were studied. The results show that the Na⁺, Cl^-, conductivity and pH value in soil solution increased significantly with the increase of NaCl concentration. The Na⁺ content in soil was the highest at the phase Ⅲ and Ⅳ, Cl^- contents were all high after the phase Ⅲ. The pH value in Zhengdan 958 soil was lower than that of Danyu 92 at every phase. Na⁺ contents in rhizosphere soil were significantly lower than that in non rhizosphere soil, while Cl^- contents were opposite. The pH value in rhizosphere soil solution was lower than that in non rhizosphere soil.

Key words: NaCl stress, Na⁺ , Cl^-, conductivity, pH