Effect of two of herbicide atrazine degrading-bacteria on alleviating phytotoxicity of sugar beet seedling

The study is on separation of two herbicide atrazine degrading-bacteria from soil, and alleviating phytotoxicity of sugar beet seedling. The results showed that atrazine degradation rates of bacteria I and bacteria II are 30.4% and 32.8% in three days cultivation, respectively. Rate of 1%~2% atrazine residues (about contents 21.6~43.2 μg g/kg in soil) did not have a negative impact on germination and emergence of sugar beet seeds, but atrazine damage of sugarbeet seedlings were incurred after then. The more atrazine residues is, the greater injury of seedlings occur. The symptom seedlings injury is slowing down growth until death. Application bacteria I to soil in which atrazine content is from 21.6 to 43.2 μg g/kg, death time of sugar beet seedlings is delayed, but result to similar mortality and biomass in sugar beet seedling comparing to without bacteria I in seedling harvest. Application of bacteria II, no injury and deaths emerge to sugar beet seedlings, and biomass of sugarbeet seedling are improving significantly comparing to without bacteria II in seedling harvest, similar to the control.