In controlled condition of deep flow hydroponics,the experiment studied the effect of iodine on flowering,bearing and yield of cherry tomato(Lycopersicon esculentum var.cerasiforme)treated with solutions of different iodide(I-)concentrations.After I- treatments,the node order of inflorescence,from the 3rd to the 5th,was 2-3 nodes lower than that of the CK.The fruit of plants treated in solutions with I- concentration of 2.0 mg·L^-1 and high I- concentration(5.0-6.0 mg·L^-1)ripened 5-8 days ahead of the CK.With respect to fruit setting rate,there was no significant difference between those plants treated with I- concentration of 1.0-4.0 mg·L^-1 and the CK;but for plants treated with high I- concentration(5.0-6.0 mg·L^-1),it was significantly lower

than the CK.The flower number,fruit number and yield with low I- concentration treatment(1.0-2.0 mg·L^-1)were significantly larger than the CK,while the yield of plants treated with high I- concentration(5.0-6.0 mg·L^-1)was significantly lower than the CK.Fruit weight decreased with the increase of I- concentration in solutions,but there was no significant difference between those treated with I- concentration of 1.0-3.0 mg·L^-1 and the CK.To summarize these results,it can be concluded that the optimal I- concentration provided for cherry tomato growth should be 1.0-2.0 mg·L^-1.