Benefits of Corn-Cob Biochar to the Microbial and Enzymatic Activity of Soybean Plants Grown in Soils Contaminated with Heavy Metals

Synchronous effects of biochar on heavy metals stress, microbial activity and nodulation process in the soil are rarely addressed. This work studied effects, under greenhouse conditions, selected Cd2+, Pb2+ Ni2+ soybean plants grown two different soils amended with biochar, their effect enzymatic activity. As a result interference between overcame metal problems maintained population major groups (bacteria–fungi). There was an increase degree resistance (RS) to when added study. Numbers bacterial nodules significantly increased, particularly by using higher rate compared control, either adding alone or mixing it metals. The arginase increased 25.5% 37.1% clay sandy soil, respectively, control. For urease (UR), 105% 83.8% result, considerations as amendment should be first priority.