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Saha, G.
- "Possible Microfossils" from the Archaean Banded Iron Formation (Bailadila Group), Madhya Pradesh, India
Abstract Views :207 |
PDF Views:2
Authors
P. K. Raha
1,
S. N. Parulkar
2,
S. C. Ghosh
3,
S. Some
3,
U. S. Kundu
3,
Manoj Kumar
4,
G. Saha
4,
I. K. Misra
4
Affiliations
1 Coal Wing, Geological Survey of India, Calcutta, IN
2 Geological Survey of India, Raipur, IN
3 Geological Survey of India, Calcutta, IN
4 Geological Survey of India, Nagpur, IN
1 Coal Wing, Geological Survey of India, Calcutta, IN
2 Geological Survey of India, Raipur, IN
3 Geological Survey of India, Calcutta, IN
4 Geological Survey of India, Nagpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 6 (2000), Pagination: 663-673Abstract
SEM studies have recorded presence of filamentous and unicellular spheroidal structures which are regarded as "possible microfossils", from the stromatolitic Archaean (ca. 3.0 Ga old) banded iron formation (BIF), Bailadila Group. Spheroidal bodies have diameters that range from 0.5 to 6.9 microns. The frequency of forms with smaller diameters is greater than those with the diameter above 3.0μm. The filamentous structures range from less than 100 nanometres to 1.2μm in diameter. Syngenetic nature of these microfossils has been established. Though a large number of these microfossils could be identified in the SEM, they could not be observed in petrographic thin sections under optical microscope most probably because of their association with, and being clouded by, opaque haematite.Keywords
Archaean, Banded Iron Formation, Bailadila Group, Bastar District, Madhya Pradesh.- Studies on Emission Potentiality of Nitrous Oxide from Wheat Field under Changed Climate
Abstract Views :245 |
PDF Views:91
Authors
Affiliations
1 Department of Agricultural Meteorology and Physics, Bidhan Chandra Krishi Viswavidyalaya, Nadia 741 252, IN
2 Department of Environmental Science, University of Kalyani, Kalyani, Nadia 741 235, IN
1 Department of Agricultural Meteorology and Physics, Bidhan Chandra Krishi Viswavidyalaya, Nadia 741 252, IN
2 Department of Environmental Science, University of Kalyani, Kalyani, Nadia 741 235, IN
Source
Current Science, Vol 109, No 4 (2015), Pagination: 768-774Abstract
Emission of nitrous oxide (N2O) from wheat field under various management practices was measured over two years. The experimental design consisted of two winter wheat (Triticum austivum L.) varieties with three nutritional treatments and two dates of sowing. The results revealed that soil moisture and soil temperature at different depths are the key parameters influencing N2O emission. A positive increase of N2O flux was noticed with increasing soil moisture along with decreasing soil temperature at specific wheat phenophases. Maximum N2O was emitted at the flowering stage. Individual factors, viz. nutrient, date of sowing and variety, and an interactive combination of these factors significantly influenced N2O emission rates. It was also found that there was no significant association between wheat grain yield and seasonal N2O flux.Keywords
Emission Potentiality, Nitrous Oxide, Soil Environment, Wheat Yield.- Methane and Nitrous Oxide Emission from Kharif Rice Field as Influenced by Nutrients and Moisture Regimes in New Alluvial Agroclimatic Region of West Bengal
Abstract Views :225 |
PDF Views:84
Authors
Affiliations
1 Department of Agricultural Meteorology and Physics, Bidhan Chandra Krishi Viswavidyalaya, Nadia 741 252, IN
2 Department of Environmental Science, University of Kalyani, Kalyani 741 235, IN
1 Department of Agricultural Meteorology and Physics, Bidhan Chandra Krishi Viswavidyalaya, Nadia 741 252, IN
2 Department of Environmental Science, University of Kalyani, Kalyani 741 235, IN