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Title: Reclamation of low land/barren land through fly ash amendment
Authors: Srivastava, N K
Tripathi, R C
Jha, S K
Bharati, S K
Masto, R E
Selvi, V A
Thakur, S K
Issue Date: Jun-2017
Publisher: NISCAIR-CSIR, India
Abstract: Considering huge generation of fly ash (185 million tons/annum) from 132 thermal power plants (TPPs) in the country and its insufficient utilization (up to 60%), there is urgent need for the development of an eco-friendly technology capable of utilizing it on bulk scale on sustainable basis. Keeping view fly ash as a useful ameliorant that may improve the physical, chemical and biological properties of problematic soils and as a source of plant nutrients (macro and micro), field demonstration trials were carried out on 8.4 acre of unutilized and undulating low lying area at Kali Mela, Jamadoba, Dhanbad filled with Tata Steel's FBC ash (up to a depth of 4 m) to reclaim it using biological amendments such as top soil layer (4 cm), cow dung manure, coco peat, vermi-compost, bio-fertilizer and NPK fertilizers (suitable proportions), selection and plantation of adaptable plant species (forestry, fruit bearing and oil yielding) . The planted species were monitored in respect of growth and biometric parameters at different growth stages followed by physicochemical and biological characterization of ash filled low land. The obtained results evinced that among the physicochemical properties, textural composition, bulk density, water holding capacity, porosity, and major/secondary and micro-nutrient levels of ash filled low land significantly improved with the progressive growth of planted species apart from considerable improvement in growth/biometric parameters and physiological behavior of the planted species. The different biological parameters (ectomycorrhiza, N-fixing bacteria, P-solubilizing bacteria, and dehydrogenase activity) were found to have increased at successive stages of the plantation. The beneficial uses of fly ash in agro-forestry applications were popularized periodically among the local farmers/inhabitants. As such the low lying area could be sustainably reclaimed using fly ash in bulk scale through biological means, which can be further extended in the vicinity of other power plants in the country.
Page(s): 30-37
Appears in Collections:BVAAP Vol.25(1&2) [June-December 2017]

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