EFFECT OF APPLICATION OF BENEFICIAL MICROORGANISMS, LIME, ORGANIC AMENDMENTS AND TOP SOIL ON GROWTH OF CROTALARIA STRIATA DC IN COAL MINE OVERBURDEN DUMP SPOILSP. HAZARIKA, N.C. TALUKDAR, AND Y.P. SINGH
Effect of application of arbuscular mycorrhizal fungi (AMF), phosphate-solubilizing bacteria (PSB), general bacteria and fungi (GBF) and amendments with farmyard manure (FYM), lime, top soil was studied in a pot experiment for coalmine overburden dump (OBD) spoils 1- and 5- year (yr) of Tikak Colliery, Assam, India on biomass production of Crotalaria striata DC and contribution to physicochemical and microbial properties of colliery spoils. AMF colonized in plant roots and increased above ground biomass in inoculated pots. AMF spore numbers increased many folds at harvest in the inoculated pots in 1-yr OBD spoil in comparison to the number of spore inoculated to them. The treatment combination Lime +AMF + FYM had favorable effect on biomass production both in 1-yr and 5-yr OBD spoils. Dual inoculation of AMF+ PSB was also found effective on plant growth. Plant growth was poor in 5-yr OBD spoil than that of 1-yr OBD spoil irrespective of the treatment combination applied. This could be reflection of more harsh condition for plant growth in 5-yr OBD spoils with very high level of H+ ions. Amendment with topsoil of natural forest was also effective in improving plant growth in coalmine spoils. The best treatment combination for biomass production was also superior in improving physico-chemical and biological properties of colliery spoils.
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