Vegetation performance of Niger on bauxite mining soil for sustainable cultivation in overburden disposal area
2021
Panda, Debabrata | Patra, Bidyutlata | Behera, Prafulla K. | Nayak, Jayanta Kumar
Restoration of mining overburden disposal area is a challenging effort to minimize environmental impacts and boost sustainable agricultural production. A pot study was performed to assess the growth and physiological performances of Niger [Guizotia abyssinica (L.f.) Cass.] under varying mining soil amendments in garden soil to explore the possibilities of cultivation of Niger in bauxite mining overburden disposal area. Significant increase in plant biomass and metal tolerance index of Niger seedlings was recorded under lower concentrations (10%, 20%) of mining soil and further declined with increasing of mining soil amendments. Leaf photosynthetic pigments, SPAD index and chlorophyll fluorescence parameters were not remarkably changed under both the concentrations of mining soil in comparison with the plants grown on garden soil, but these studied parameters were remarkably decreased under elevated mining soil amendments. The shape of OJIP fluorescence transients was also decreased under higher concentrations of mining soil. A pronounced increase of some antioxidant enzymes activities in Niger under elevated mining soil concentration indicates its metal tolerance and detoxification ability to oxidative stress. Based on the strong plant performances, the present study highly encourages the cultivation of Niger under bauxite mining overburden by 20% mining soil amendments.
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