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K. C. Pradhan , S. N. Das

Abstract

Seventeen forest plants species harboured as many as 25 nematode species. Association of 22 phytoparasitic nematode species were noticed on 35 different medicinal plants. Rotylenchulus reniformis and Helicotvlenchus dihystera were found to be present in large numbers and were associated with most of the plants species examined. As many as 7 types of plant feeding nematode species were associated with Asparagus racemosus, 5 different nematode species were recovered from Cinnamomum camphora. Curcuma longa, Erythrinae variegata, Tylophora indica, 4 nematode types wore noticed on each of Achyranthes aspera, Camellia chinensis, Curcuma longa (wild), coffea robusta, Ficus carica, Heritiera minor and in Piper nigrum and 3 nematode species were Isolated from each of Adhatoda vasica, Cymbopogon flexuosa, Zingiber officinale, Vitis quadrangularis, Stephania hernandifolia, Sida cordifolia. Piper longum.

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S. N. Das , B. B. Roy

Abstract

Three upland soils of red and lateritic region of Hirbhum district have been classifier after proper characterisation. These soils develop in high temparature regime which falls in hyperthermic group. Morphological descriptions, physico-chemical, physical and mineras logical properties of soil profiles have been cited for proper characterisation. Argillans are present in soil profile No. I and 3, illuviation of silicate clay down the profile produces argillic horizon, leaching is more pronounced in profile No.3 than soil profile No. 1. Soil profil. No. 1 and 2 fall in the coarse loamy group of textural class whereas soil profile No. 1 Falls in fine loamy group. Soils of all the three profiles are dominant with illite clay and the mineralogy class is illitle, All these properties suggest, the soil of profile No.1 and 1 are member of course loamy, illitis, hyperthermic family of Typic Haplustult and Paralithic Ustorthent respectively whereas the soil of profile No.3 is a member of fine loamy illitic, hyperthermic family of Ultic Haplustalf. These classifications of upland soils will certainly give an adequate information for vastly afforested areas of Birbhum district of West Bengal for management purposes.

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S. Raman , S. N. Das

Abstract

Occurrence of ten types of plant parasitic nematodes was noticed around the ischolar_main zones of 26 different forest trees in the Khurdha and Nayagarh forest ranges of Orissa. The relative abundance of the important nematode species in the descending order is as follows: Xiphinema, Hemicycliophora, Hoplolaimus, Paralongidours, and Longidorus: maximum number of which were recorded on Tectona grandis L., Emblica officinalis Gaertn, Casiaroms equisetifolia Forst. Syzygium cuminii Skeel., Shorea robusta Gtn., respectively. Among these plants, S. cuminii was found to be the most favoured host for the nematodes and no parasitic forms were obtained from the rhizospheres of Ficus carica L. and Pinus roxburghii Sargent.

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S. N. Das , T. C. Maiti , S. K. Banerjee

Abstract

Three catenas comprising of ten soil profiles on different physiographic position were taken for this investigation. This paper deals with only morphological studies (Part I) and physico-chemical and mineralogical studies of soils will follow in later part (Part II). The soils are related to the elements of landscape and the sequence represents as a topodrainage sequence. Microclimate, water table, vegetation, erosion-deposition or a combination of these influence the genesis of soils, fully defining the concept of a Catena. The evidence of desilication from morphological studies reveals that these soils have under gone the process of laterisation. Ten soil profiles of the three catenas were classified according to Soil Taxonomy. All the soils have been classed under Alfisol except in the case of the upland and midland profiles of Catena A and the upland profile of Catena C which may be placed under Entisol.

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S. N. Das ¹, D. P. Sen ²

Affiliations
1 Geological Survey of India, Calcutta., IN
2 Department of Geology, I.I.T., Kharagpur-721302, IN

Abstract

The Talchir Group of rocks in India form a very important stratigraphic horizon by their presence at the base of all the Gondwana basins. Talchirs have been recognised as glacial sediments. The present study suggests that the Talchir Group was deposited both as stratified drift and unstratified drift. The glaciers responsible for Talchir sedimentation in eastern India belong to piedmont glacier system. The number of times the glacial lobes advanced into different basins varies from basin to basin. In all the basins the bulk of the sediments was deposited during first deglaciation period as meltwater channel, esker, glaciolacustrine delta and lake deposits. The topography surrounding the basin during upper Talchir time provided infra-structure for Barakar sedimentation.

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Bijoy Krishna ¹, S. N. Das ²

Affiliations
1 Botanical Survey of India, Howrah, IN
2 Bolanical Survey of India, Calcutta, IN

Abstract

No Abstract.

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S. Pattnaik ¹, S. N. Das ¹, N. Behera ²

Affiliations
1 Dept. of Microbiology, Gayatri College of Pharmacy, Sambalpur, Sason-768200, Orissa, IN
2 School of Life Science, Sambalpur University, Burla-19, IN

Abstract

A newly isolated strain of Gram positive Bacillus species showed tolerance towards extreme parameters like temperature, PH, Oxygen supply, Starvation, UV etc. The strain was isolated from air sample and identified by following routine diagnostic microbiological techniques. The Bacillary strain showed its tolerance level for temperature up to 80°C, PH both at high (12.0) and low range (2.0), Scanty Oxygen supply (Facultative anaerobic condition), Nutritional starvation (0.2 % of nutrient in media) and with an exposure to UV light (1650 A°) for 30 minutes.

Keywords

Gram Positive Bacillus Strain, Tolerance, Extreme Parameters.

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