Abstract:

To solve the problem that a large number of residues in soil caused by the long-term application of the herbicide fomesafen in soybean field is harmful to sensitive succession crops, in this study, the pot experiment was conducted to investigate the effect of adding bacterial fermentation liquid on germination rate of maize seeds and seedling growth index, and a field experiment was conducted to explore the effect of adding bacterial fermentation liquid on the residue of fomesafen in soil and maize grain and maize yield. Pot experiment showed that there were extremely significant differences in the emergence rates of maize between the 30 d and 60 d soil treatment groups, and there were significant differences in dry weights of roots. When the soil was treated with bacterial solution for 30 days, the residual fomesafen had little effect on the growth of maize seedlings. The results of field experiments showed that no fomesafen was detected in soil at harvest time, and 86.91%-97.87% fomesafen was absorbed by maize. The residual rate of fomesafen in maize seeds decreased by 21.8%-32.76% after the application of bacterial solution, which made the residue meet the national standard, and increased the number of maize sticks and the average yield of maize. The application of bacterial solution has a better remediation effect on the soil polluted by fomesafen and could reduce the harmful phenomenon of fomesafen to the following maize.

Key words: fomesafen, bacteria, soil remediation, pot experiment, field experiment