Abstract: The study on the soil arsenic (As) accumulation under different types of agricultural use in Shouguang of Shandong Province showed that farmland soils had an average As content of 9.63 mg·kg^-1, with the highest being 15.15 mg·kg^-1. Compared with the local background value (9.3 mg As·kg^-1), 53.1% of soil samples was detected as As enrichment. The soil As content was high in the west, east and north parts of Shouguang, relatively lower in the middle part, and the lowest in the south part. Different agricultural use had an obvious effect on the soil As content, which was decreased in the order of wheat/maize land>cotton field>protected vegetable land>un-covered vegetable land. Such a difference in soil As content was mainly affected by agricultural ac-tivities. With the increasing year of vegetable planting, soil As content had an increasing trend, be-cause the As input from pig dung and chicken feces was the main source of soil As in protected ve-getable land. Soil As enrichment could be reduced to some degree by applying soybean cake fertilizer.

Key words: Rice, Allelopathic variety, Water, Fertility and light, Allelocehmical, Secondary metabolite