Abstract: The experiment was conducted to reveal the impact of surface ozone(O3)concentration increasing on dry matter production and yield of soybean,by using 9 OTCs with same structure and function.3 treatments were exposing to unfiltered air(CK),ozone concentration with 100nL·L-1(T1)and 150nL·L-1(T2) respectively.The results showed that dry matter production,number of root nodule,root noodle weight,translation rate and movement rate of root/stem decreased significantly under T1 and T2(P<0.05).T1 had no significantly effect on the translation rate of leaf in the filling stage and dry matter production rate in later filling stage.The pod appearing delayed and dry matter production rate in later filling stage decreased significantly under T2.Elevated O3decreased significantly grains number and grains weight per plant and yield,but no effect on the weight per 100 seeds.The results indicated that the yield decreasing resulted from dry matter production rate decreasing under T1,and dry matter translation restraining and dry matter production rate decreasing under T2.

Key words: Ozone(O3), Ozone(O3), Soybean, Dry matter production, Dry matter distribution