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Feasibility of coal combustion fly ash alone and in combination with gypsum and green manure for reclamation of degraded sodic soils of the Indo-Gangetic Plains: A mechanism evaluation

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Title Feasibility of coal combustion fly ash alone and in combination with gypsum and green manure for reclamation of degraded sodic soils of the Indo-Gangetic Plains: A mechanism evaluation
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Creator V.K. Mishra, S.K. Jha*, T. Damodaran, Y.P. Singh, S. Srivastava, D.K. Sharma, J. Prasad
 
Subject amelioration, degraded sodic soils, fly ash, green manure, gypsum
 
Description Not Available
The disposal of coal combustion fly ash (FA) generated from thermal power plants is a
worldwide problem. However, its low bulk density and presence of calcium and iron–
aluminium sesquioxide make it a prospective ameliorant alternative to gypsum for
amending degraded sodic soils. A field experiment consisting of eight treatments with
variable doses of FA and gypsum along with green manure (GM) was conducted for
evaluating the amelioration mechanism by measuring changes in pH, exchangeable
sodium percentage, zeta (ζ) potential, and properties of meso‐aggregates (0.5–
2.0 mm). The results showed that compared with control, FA significantly reduced
ζ‐potential, bulk density, and pH. The GM with FA further decreased ζ‐potential
and increased hydraulic conductivity. The hydrolysis of iron and aluminium
sesquioxide, present in FA, functioned to lower soil pH, whereas the reduction in
exchangeable sodium percentage is attributed to bioavailable Ca (27.4%). A lower
FA application rate produced better crop yields. FA 2.5% (w/w) alone, compared to
the FA 5% (w/w), resulted in higher yield of rice (1.96 tonnes ha−1), whereas 25%
gypsum requirement (25GR) + FA 2.5% (w/w) and 25GR + FA 2.5% (w/w) + GM provided
wheat yield on par with 50% gypsum requirement (50GR). The study identifies
that where gypsum is scarce, the recommended amendment is 25GR + FA 2.5% or
25GR + FA 2.5% + GM when applied for sodic soil to achieve a similar yield response
to standard 50GR. If gypsum is unavailable, a one‐time application of FA 2.5% (w/w)
alone will improve the productivity of degraded sodic soils corresponding to more
exchangeable calcium and organic carbon, which were found to be higher for
meso‐aggregates (0.5–2.0 mm).
Department of Science and Technology
 
Date 2021-07-24T07:14:52Z
2021-07-24T07:14:52Z
2019-03-27
 
Type Research Paper
 
Identifier V.K. Mishra, S.K. Jha*, T. Damodaran, Y.P. Singh, S. Srivastava, D.K. Sharma, J. Prasad (2019). Feasibility of coal combustion fly ash alone and in combination with gypsum and green manure for reclamation of degraded sodic soils of the Indo-Gangetic Plains: A mechanism evaluation. Land Degradation and Development 30(11): 1300-1312.
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http://krishi.icar.gov.in/jspui/handle/123456789/49746
 
Language English
 
Relation Not Available;
 
Publisher Wiley