Abstract: In order to investigate the content status and distribution characteristics of soil available microelements, such as Fe, Mn, Cu, Zn, B, Mo, in tobacco growing area, 228 soil samples were selected from Guangyuan City in northern Sichuan for analysis. Meanwhile, the distribution characteristics of the above microelements on the function of tobacco growing area, soil type and altitude were analyzed. It was shown that the soil available Fe was at the rich or extremely rich level with the average content of 65.42 mg·kg^-1. Soil available Mn, Cu and Mo were over the medium level with the average content of 31.79, 1.65 and 0.15 mg·kg^-1, respectively. Soil available Zn and B were at the poor or extremely poor level with the average content of 0.90 and 0.19 mg·kg^-1, respectively. Soil available Fe, Mn, Cu and Mo exhibited higher average content in Wangcang County, while soil available Zn and B were higher in Jian��ge County. The average content of soil available Fe was higher in yellow soil, and Mn, Zn and Mo were higher in yellow brown soil, yet soil Cu and B were relatively higher in fluvo-aquic soil. The average content of Mo and B showed no significant difference among different altitudes. Soil available Mn content increased with the elevated altitude. Soil available Cu and Zn contents were higher over 1 100 m, while soil available Fe was higher in lower altitude (500-700 m).

Key words: microelement, tobacco growing soil, northern Sichuan