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Ghosh, Biswajit
- Impacts of Rice Intensification System on Two C. D. Blocks of Barddhaman District, West Bengal
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Authors
Affiliations
1 Khorad Amena High School, Satgachia, Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Barddhaman 713 104, IN
1 Khorad Amena High School, Satgachia, Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Barddhaman 713 104, IN
Source
Current Science, Vol 109, No 2 (2015), Pagination: 342-346Abstract
Rice is an important cereal crop of West Bengal and in many of the Indian states. There is a compelling need to increase rice productivity vertically in West Bengal due to less availability of land and greater dependency of the population on the productivity of the land. For this reason, the economic and ecological potentiality of the system of rice intensification (SRI) has been evaluated by several researchers. In the present study, Monteswar and Memari-II C. D. blocks of Barddhaman district, West Bengal have been selected to analyse the impacts of SRI on economic and ecological aspects of rice-growing. Results show that benefit-cost (B : C) ratio in SRI practice is significantly higher than the conventional method of rice cultivation. Under SRI B : C ratio varies from 5.06 : 1 to 3 : 1, but in the conventional method it varies from 2.18 : 1 to 1.78 : 1. Therefore, SRI farmers are experiencing multiple benefits in terms of both economics and ecology.Keywords
Agro-Ecology, Benefit–Cost Ratio, Economic and Ecological Potentiality, System of Rice Intensification.- Environmental Impact of Sand Mining: a Case Study along the Lower Reaches of Ajay River, West Bengal, India
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Authors
Affiliations
1 Department of Geography, Sidho-Kanho-Birsha University, Purulia, West Bengal, IN
2 Department of Geography, University of Calcutta, West Bengal, IN
3 Department of Geography, Barabazar Bikram Tudu Memorial College, Purulia, West Bengal, IN
1 Department of Geography, Sidho-Kanho-Birsha University, Purulia, West Bengal, IN
2 Department of Geography, University of Calcutta, West Bengal, IN
3 Department of Geography, Barabazar Bikram Tudu Memorial College, Purulia, West Bengal, IN
Source
Journal of Environment and Sociobiology, Vol 13, No 1 (2016), Pagination: 99-108Abstract
Indiscriminate and unscientific sand mining has become a serious environmental threat to the river systems and its surrounding environment. The rapid rate of urbanization has increased the demand for sand, which is supplied from river bed through sand mining. Sand mining from river bed results in channel degradation and erosion, change in local gradient, head cutting, increased turbidity, bank erosion and sedimentation of riffle areas and ruins its flow regimes and total sedimentary environment. In lower reaches of Ajay river, unscientific sand mining is a serious issue from Illambajar (Birbhum) to Mongalkot (Burdwan) fluvial environment of Ajay river basin, which is highly affected by in-stream sand mining. Natural morphological characteristics of Ajay river are changed and damaged due to over mining of sand. Excessive in-stream sand mining is a threat to Illambajar bridge and Nutanhut bridge. River embankments are also affected by river bed mining. Sand mining also affects the adjoining groundwater system. In Mongalkot and Ketugram Blocks (Burdwan), ground water level becomes lower than the past. Sand mining also generates extra vehicle traffic, which negatively impairs the environment and pollution level continuously gets higher. Total station survey was carried out to detect the changes in river bed. Topographical sheets and satellite images were geocoded to extract past status of river health and tried to correlate with the present situation. GPS (Handheld-Germin etrexH-20) was used as necessary tool in the present study. The main objective of the present study is to evaluate the impact of sand mining on riparian environment.Keywords
Sand Mining, Sedimentation, Head Cutting, Embankments, Organism.References
- Bhattacharya, A. K. 2009. Channel patterns, depositional behaviour and sediment composition of a tropical river, Northeast India: A study from source to sink. Unpublished Progress Report, Jakarta, Indonesia.
- Bhattacharya, A. K. 1972. A study of the Ajay river sediments. In : The Bhagirathi-Hooghly-Basin (ed. Bagchi. K.) Proc. Interdisciltrinury Symp: 18-32.
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- Padmalal, D. 2008. Effect on river sand mining: A case from the river catchment of Vemband lake, South East Coast of India. Environmental Geology, Springer, 54: 879-889.
- Mineralogy of the Manipur Ophiolite Belt, North East India:Implications for Mid-Oceanic Ridge and Supra-Subduction Zone Origin
Abstract Views :371 |
PDF Views:144
Authors
Thungyani N. Ovung
1,
Jyotisankar Ray
1,
Xueming Teng
2,
Biswajit Ghosh
1,
Madhuparna Paul
1,
Proloy Ganguly
1,
Saradee Sengupta
1,
Supriyo Das
1
Affiliations
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
1 Department of Geology, Calcutta University, 35 B.C. Road, Kolkata 700 019, IN
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, CN
Source
Current Science, Vol 112, No 10 (2017), Pagination: 2122-2129Abstract
Mineralogical studies on the mantle and crustal sections of the Manipur Ophiolite Belt (MOB) lead to important findings pertaining to its genesis and controlling tectonic milieu. The wide compositional gap in the Cr# and Mg# content of spinel in the mantle peridotites of MOB implies upper mantle melting in two different tectonic settings. The tectonic discrimination diagrams based on spinel chemistry indicate a midoceanic ridge (MOR) origin for the high-Al spinel peridotites and a supra-subduction zone origin for the high-Cr spinel peridotites. The pyroxenite mantle dyke, ultramafic cumulate and pillow-basalt record temperature in the range of 600-1030°C, 600-800°C and 700-1005°C respectively. Plotting of clinopyroxene composition of pillow-basalt in the TiO2-Na2O-SiO2/100 (wt%) tectonic discrimination diagram, implies a subduction-related origin of the basalts. Experimental studies on the serpentine stability indicate that it was dominantly affected by high temperature-low deformation setting.Keywords
Mineralogical Study, Ophiolite Belt, Pyroxenite Mantle Dyke, Pyroxene Thermometry.References
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- Singh, A. K., High-Al chromian spinel in ultramafic rocks of Manipur Ophiolite Complex, Indo-Myanmar Orogenic Belt: implication for petrogenesis and geotectonic setting. Curr. Sci., 2009, 96(7), 973–978.
- Devi, L. D. and Singh, I., Geochemical study of peridotites from the Manipur Ophiolite Complex, Northeast India with special reference to their PGE concentration. J. Geol. Soc. India, 2011, 77, 273–279.
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- Singh, A. K., Singh, I., Devi, L. D. and Singh, R. K. B., Geochemistry of Mid-Ocean ridge Mafic intrusive from the Manipur Ophiolitic Complex, Indo-Myanmar Orogenic Belt, NE India. J. Geol. Soc. India, 2012, 80, 231–240.
- Singh, A. K., Petrology and geochemistry of Abyssal peridotites from the Manipur Ophiolite Complex, Indo-Myanmar Orogenic Belt, Northeast India: Implication for melt generation in midoceanic ridge environment. J. Earth Sci., 2013, 66, 258–276.
- Singh, I., Devi, L. D. and Chanu, Th. Y., Petrological and geochemical study of serpentinized peridotites from the southern part of Manipur Ophiolite Complex, Northeast India. J. Geol. Soc. India, 2013, 82, 121–132.
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- Spectral Response of Few Important Textural Variants of Chromitite and its Potential in Estimating Relative Grades of Chromitite – A Case Study for Chromitite of Nuggihalli Schist Belt, India
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Authors
Affiliations
1 Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization, Balanagar, Hyderabad 500 625, IN
2 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
1 Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization, Balanagar, Hyderabad 500 625, IN
2 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1721-1731Abstract
We have collected, processed and analysed the reflectance spectra of representative chromitite samples of spot type, clot type and disseminated type textural variants to understand the diagnostic spectral features of each of these samples. We have found that the reflectance spectrum of each textural variant is distinct from the spectra of other variants despite having few common absorption features. Spectral features of chromitite samples are governed by the spectra of two dominant minerals, chromite and chlorite. Spectral features of chromitite at 550 nm and 1100 nm are governed by electronic transition process in Fe3+ and crystal field effect in Fe2+ ions present in chromite structure respectively. On the other hand, spectral features at 1400 nm, 1900 nm and 2300 nm are related to the vibration of O–H, H–OH and metal hydroxide bonds in chlorite. Amongst these features, the spectral feature at 1100 nm (due to Fe2+ in chromite grains) is common to all three major textural varieties of chromitite samples studied here. Electron probe micro analysis (EPMA) data of chromite and chlorite grains of each texture are used to relate the presence and abundance of Fe2+ (in chromite grains) with absorption feature. Width of the 1100 nm feature has a correlation value 0.95, while depth of the same feature has a correlation value 0.94 with the abundance of chromite mineral estimated using modal analysis of chromite samples. Therefore, spectrometric parameter of 1100 nm spectral feature of chromitite can be used as proxy for estimating modal abundance of chromite in chromitite samples after estimating deposit specific correlation coefficient.Keywords
Chromitite, Electronic Processes, Modal Analysis, Spectral Feature, Texture, Vibrational Processes.References
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- Application of the Ecological Footprint Method for Measuring Sustainability of Agricultural Land use at a Micro Level in Barddhaman District, West Bengal, India
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Authors
Affiliations
1 Khorad Amena High School, Satgachia, Purba Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Purba Barddhaman 713 104, IN
1 Khorad Amena High School, Satgachia, Purba Barddhaman 713 422, IN
2 Department of Geography, The University of Burdwan, Purba Barddhaman 713 104, IN
Source
Current Science, Vol 115, No 10 (2018), Pagination: 1913-1920Abstract
In the present study we used the ecological footprint method to numerically measure the sustainability of agricultural production at the micro level. For this, two community development blocks of Barddhaman district, West Bengal, India were selected. As a consumption- based method, it is most suitable for measuring cropland footprint, biocapacity of croplands, and their ecological surplus and deficit status of an environmental indicator. The integrated result represents higher sustainability of agricultural system, but crop-wise assessment explores some negative aspects with respect to self-sufficiency of the study area that demand necessary transformation of existing cropping pattern.Keywords
Agricultural Land Use, Biocapacity, Ecological Footprint, Sustainability.References
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Affiliations
1 Plant Bio-technology Laboratory, Post Graduate Department of Botany, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, West Bengal, IN
1 Plant Bio-technology Laboratory, Post Graduate Department of Botany, Ramakrishna Mission Vivekananda Centenary College, Rahara, Kolkata-700 118, West Bengal, IN