Effects of different bacterial chaff fertilizer on absorption and transfer of heavy metals by corn in sewage irrigation pollution soil

Pot experiments were conducted to study the effects of different bacterial chaff fertilizer on maize growth，absorption and transfer of heavy metals（Cu，Pb，Cr）in different parts of maize（root，stem，leaf，ear）. Results show that，compared with the control，by application of different bacterial chaff fertilizer，the various parts of corn dry weight and plant high increased； The mass fractions of Cu and Pb in underground part increased by 11.20%， 17.12%，Cr decreased by 24.13%，the mass fraction of Cu and Pb in above ground part decreased，Cr in maize leaf increased. The transfer coefficient and enrichment coefficient of Cu reduced，and were both less than 1；Transfer coefficient and enrichment coefficient of Pb reduced，while the transfer coefficient of Pb was greater than 1，the transfer coefficient and enrichment coefficient of Cr both increased，the transfer coefficient was greater than 1. The results indicate that the bacterial chaff fertilizer can effectively reduce the absorption of Cu，Pb and Cr，and reduce the Cu and Pb transfer rate to the aboveground，fix the Cr in maize leaf，reduce the Cr content in other parts.