Vermiculite
Vermiculite (Grade 4) and milled wheat bran (250 mesh) were heated in a hot air oven at 70°C for 3 days using metal pans. Vermiculite (100 g), wheat bran (3.3 g), liquid culture (14 mL), and 0.05 N HCl (17.5 mL) were mixed and packed. This was immediately used for soil application ( et al., 1991).
