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Articles by A. Gangopadhyay
Total Records ( 2 ) for A. Gangopadhyay
  K. Adhikari , B. Chakraborty and A. Gangopadhyay
  Transforming parametric concentrations into qualitative scores irrespective of unit has made the WQI a comprehensive and easy to use tool to the decision makers. As criteria of water quality vary with purpose of use of the groundwater, selection of water quality parameters, involved in working out quality index for specific use also differs. Use of Groundwater Quality Index (GWQI) technique to assess irrigation water quality is innovative in this study. Electrical Conductivity (EC), Sodium Adsorption Ratio (SAR) and Residual Sodium Carbonate (RSC), judged as the three most important parameters to designate irrigation quality of groundwater have been used to work out GWQI in this study. Preparation of ISO Index maps using water quality scores, derived through GWQI tool, vividly portray the irrigation water quality status of the study area where most of the area fall under excellent and good categories. The marked difference in water quality with respect to season in some areas of Southeastern and Southwestern parts of the study area may be correlatable to the recharge and discharge zones of groundwater, respectively.
  Bidisha Majumder , Biswapati Mandal , P. K. Bandyopadhyay , A. Gangopadhyay , P. K. Mani , A. L. Kundu and D. Mazumdar
  Soil organic C (SOC) pools under long-term management practices provide information on C sequestration pathways, soil quality maintenance, and crop productivity. Farmyard manure (FYM), paddy straw (PS), and green manure (GM) along with inorganic fertilizers were used in a 19-yr-old rice (Oryza sativa L.)–wheat (Triticum aestivum L.) cropping system in subtropical India to evaluate their impact on SOC stock, its different pools—total organic C (Ctot); oxidizable organic C (Coc) and its four fractions of very labile (Cfrac1), labile (Cfrac2), less labile (Cfrac3), and nonlabile C (Cfrac4); microbial biomass C (Cmic); and mineralizable C (Cmin). Cropping with only N–P–K fertilization just maintained SOC content, while N–P–K plus organics increased SOC by 24.3% over the control, their relative efficacy being FYM > PS > GM. A minimum of 3.56 Mg C ha–1 yr–1 was required to be added as organic amendments to compensate for SOC loss from cropping. The passive (Cfrac3 + Cfrac4) pool and Cmin constituted about 39 and 11.5%, respectively, of Ctot. Organics contributed toward the passive pool in the order FYM > PS > GM. Most of the pools were significantly (P = 0.005) correlated with each other. Yield and sustainable yield index were strongly related with Cfrac1, Coc, Cmic, and Cmin. Results suggest Cfrac1 as a useful indicator for assessing soil health, and balanced fertilization with FYM as suitable management for sustaining crop productivity of the rice–wheat system.
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