Abstract
A pilot study was conducted at a backfill area of coal mine overburden dump (OBD) in Tikak Colliery, North Eastern Coal Field, Margherita, Assam, India, to evaluate the performance of 42 native plant species in a revegetation experiment with integrated biological approach during 2018-2021. The plantation was done with application of lime @ 15 gm per pit and farm yard manure (FYM) @ 2 kg per pit and planting nursery raised inoculated seedlings with arbuscular mycorrhizal fungi (AMF) and plant growth promoting rhizobacteria (PGPR) after a series of pot experiments. Pot culture experiments were done to obtain the best treatment combination for the field trails. The seed ball technology was also adopted in the initial year to stabilize the area with green herbaceous cover and to improve soil parameters. The result revealed that herbaceous species growing from seed ball sowing could survive in the OBD area. The best performed treatment combination was AMF + PGPR + Lime + FYM. Out of a total of 42 native plant species 17 were recorded for 60- 70 % survival after 2 years of planting on the OBD site. These practices completely replaced the application of topsoil in the revegetation programme of coal mine site and may be replicated for reclamation of OBD site for successful plantation programme.
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