Utilization of biochar and Trichoderma harzianum to promote growth of shallot and remediate lead-contaminated soil

This study aimed to determine the effect of biochar and Trichoderma harzianum toward lead removal in soil, absorption, content plant tissue also growth yield shallot cultivated on lead-contaminated soil. The experimental design used was a completely factorial randomized block consisting 2 factors. first factor corn cobs which applied 1 week after basic fertilizer treatment consisted 4 levels, namely B0: without biochar, B1: 2.5 t ha-1, B2: 5 B3: 10 ha-1. second dosage liquid harzianum, TR0: T.harzianum, TR1: mL L-1, TR2: 20 three times at 14, 28 42 days planting. Data were analyzed using F test continued with DMRT (Duncan Multiple Range Test) P= 0.05 level. results showed that application ha-1 able remove decreased uptake plants. Application T. could decrease absorption not increase while increased number leaves tubers.