Asit Mandal

Publications (7) View all

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  Article: Phytoremediation of arsenic contaminated soil by Pteris vittata L. I. Influence of phosphatic fertilizers and repeated harvests.

  Asit Mandal, T J Purakayastha, A K Patra, S K Sanyal
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  ABSTRACT: A greenhouse experiment was conducted to evaluate the effectiveness of diammonium phosphate (DAP), single superphosphate (SSP) and two growing cycles on arsenic removal by Chinese Brake Fern (Pteris vittata L.) from an arsenic contaminated Typic Haplustept of the Indian state of West Bengal. After harvest of Pteris vittata the total, Olsen's extractable and other five soil arsenic fractions were determined. The total biomass yield of P. vittata ranged from 10.7 to 16.2 g pot(-1) in first growing cycle and from 7.53 to 11.57 g pot(-1) in second growing cycle. The frond arsenic concentrations ranged from 990 to 1374 mg kg(-1) in first growing cycle and from 875 to 1371 mg kg(-1) in second growing cycle. DAP was most efficient in enhancing biomass yield, frond and root arsenic concentrations and total arsenic removal from soil. After first growing cycle, P. vittata reduced soil arsenic by 10 to 20%, while after two growing cycles Pteris reduced it by 18 to 34%. Among the different arsenic fractions, Fe-bound arsenic dominated over other fractions. Two successive harvests with DAP as the phosphate fertilizer emerged as the promising management strategy for amelioration of arsenic contaminated soil of West Bengal through phyotoextraction by P. vittata.
  International Journal of Phytoremediation 12/2012; 14(10):978-95. · 1.30 Impact Factor
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  Article: IMPACT OF CLIMATE CHANGE ON SOIL BIODIVERSITY- A REVIEW

  Asit Mandal, Neenu S
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  ABSTRACT: Global climate change can have significant impacts on all the soil biodiversity and related services. These impacts can be directly or indirectly linked to the alteration of the climatic parameters (e.g. temperature, humidity). Soil biodiversity is more extensive than any other environment on the globe when all living forms are considered. The soil biota contains representations of all groups of microorganism like fungi, bacteria, algae and viruses, as well as the microfauna such as protozoa and nematodes. Today, disturbance regimes are changing drastically under the combined effects of climate change, biological invasions and direct human modifications of the environment. However, it remains very difficult to assess and predict how soil communities will respond to these disturbances. Environmental variability is an integral part of the dynamics of ecosystems, and some disturbances are unavoidable. Climate change may intensify these seasonal disturbances, stretching the limits more towards those of extreme events.
  Agricultural Reviews. 11/2012; 33(4):283-292.
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  Article: PHYTOREMEDIATION OF ARSENIC CONTAMINATED SOIL BY PTERIS VITTATA L. II. EFFECT ON ARSENIC UPTAKE AND RICE YIELD

  Asit Mandal, T J Purakayastha, A K Patra, S K Sanyal
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  ABSTRACT: A greenhouse experiment evaluated the effect of phytoextraction of arsenic from a contam-inated soil by Chinese Brake Fern (Pteris vittata L.) and its subsequent effects on growth and uptake of arsenic by rice (Oryza sativa L.) crop. Pteris vittata was grown for one or two growing cycles of four months each with two phosphate sources, using single super phos-phate (SSP) and di-ammonium phosphate (DAP). Rice was grown on phytoextracted soils followed by measurements of biomass yield (grain, straw, and root), arsenic concentration and, uptake by individual plant parts. The biomass yield (grain, straw and rice) of rice was highest in soil phytoextracted with Pteris vittata grown for two cycles and fertilized with diammonium phosphate (DAP). Total arsenic uptake in contaminated soil ranged from 8.2 to 16.9 mg pot −1 in first growing cycle and 5.5 to 12.0 mg pot −1 in second growing cycle of Pteris vittata. There was thus a mean reduction of 52% in arsenic content of rice grain after two growing cycle of Pteris vittata and 29% after the one growing cycle. The phytoextrac-tion of arsenic contaminated soil by Pteris vittata was beneficial for growing rice resulted in decreased arsenic content in rice grain of <1 ppm. There was a mean improvement in rice grain yield 14% after two growing cycle and 8% after the one growing cycle of brake fern.
  International Journal of Phytoremediation 01/2012; 14(6):621–628. · 1.30 Impact Factor
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  Article: Exploring Bioaccumulation Efficacy of Trichoderma viride: An Alternative Bioremediation of Cadmium and Lead

  Asha Sahu, Asit Mandal, Jyoti Thakur, M C Manna, A Subba Rao
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  ABSTRACT: Over the past few decades, pollution has become a major threat to human and environmental health because of contaminants in the soil and water bodies especially heavy metals viz. cadmium (Cd) and lead (Pb). The present study was carried out with the aim to study the effect of different levels of Cd (0, 5, 10, 20, 30, 40, 50, 75, 100, 125, 150 and 200 ppm) and Pb (0, 25, 50, 100, 125,150, 200, 250 and 300 ppm) application on the growth and bioaccumulation efficacy of Trichoderma viride. It was concluded that the T. viride has the capacity to accumulate more Pb than Cd, as it showed visible growth up to 300 ppm Pb. However, mycelial growth of T. viride was found till 75 ppm Cd. Thus it can be used for bioremediation of cadmium and lead from aqueous media.
  National Academy Science Letters 01/2012; 35(4-4):299-302. · 0.21 Impact Factor
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  Book: SOIL ENZYME ACTIVITY UNDER LONG-TERM FERTILIZER USE: A key determinant of nutrient availability in soil and uptake during wheat growth

  Asit Mandal, Ashok Patra, Dhyan Singh
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  ABSTRACT: This study was undertaken at long-term fertilizer experiment (LTFE) fields of IARI research farm, New Delhi, to assess the effect of long term fertilizer application over 35 years on the activity of selected soil enzymes, nutrient availability and acquisition during three physiological stages of wheat growth. Soil enzymes play a significant role in the transformation of nutrients and their availability to plants. Most of the researchers studied the effect of long-term fertilizer and crop management practices on soil microbial biomass and enzyme activities before or after the crop growing seasons. Since soil enzymes are much influenced by rhizospheric conditions, it is important to understand the level of soil enzyme activities and nutrient availability during various stages of plant growth. Hence this experiment was conducted to assess soil enzyme activity affecting nutrient availability and uptake in wheat due to long-term application of fertilizers and manures.
  05/2013; LAP LAMBERT Academic Publishing., ISBN: 978-3-659-40376-7