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Datta, A.
- Age-age Correlation Models for Dalbergia sissoo Roxb. in Semi-arid Region of Central India
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Indian Forester, Vol 135, No 8 (2009), Pagination: 1050-1058Abstract
Nine years growth data of Dalbergia sissoo progeny trial established in semi-arid region of Central India was analysed. Significantly high age-age correlations were found for tree traits viz. height, dbh and D2H. Among three traits, empirical model developed for trait index D2H was found to be best fit (adj. R2 = 0.931). Using this model, the age-age correlations were predicted and efficiency of early selection in terms of gain per year for different plantation and rotation ages was estimated. For the selection age 12 years and rotation age 40 years, the genetic gain was almost twice. But this model is time dependent and does not take into account the growth rates. Another type of model based on variance ratio and a factor of relative size dependent growth was also applied. Predictions of age-age correlations were found to be better in case of D2H than height and dbh. According to this model, selection of progenies at 9 years age seems reasonably good for the improvement of height of Dalbergia sissoo.Keywords
Dalbergia sissoo Roxb., Age-age Correlation Models, Semi-arid Region, CentralIndia
- Accelerated Breeding Programme for Short Breeding Cycle and Early Evaluation of Neem Germplasm for Azadirachtin Content through Air-layering
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Indian Forester, Vol 127, No 5 (2001), Pagination: 595-598Abstract
No abstract- Phosphate Sorption/Desorption Kinetics in Some Acidic Soils
Abstract Views :169 |
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Authors
Affiliations
1 Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Kalyani 741235, West Bengal, IN
1 Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Kalyani 741235, West Bengal, IN
Source
Journal of Surface Science and Technology, Vol 10, No 1-4 (1994), Pagination: 99-106Abstract
The kinetics of phosphate sorption/desorption in eight acidic soils were studied. The data were fitted to a modified Freundlich-type of kinetic equation and the modified Elovich equation to yield several kinetic parameters. The kinetic experiments were conducted at 35 ± 1°C and for some soil, also at 45 ± 1°C. The phosphate sorption rate coefficients and the Elovich kinetic parameters were in agreement with the trend of phosphate sorption equilibrium behaviour of the present soils. The phosphate sorption kinetic parameters showed significant correlations with soil organic matter and oxalate-extractable aluminium and iron of the soils. The possibility that an association of organic matter in acidic soils with the hydrous sesquioxides of iron and aluminium leads to the formation of chelate complexes having large active surface area for phosphate sorption has been considered for the present soils. The sorption rate coefficients increased with temperature, in agreement with the simple Arrhenius behaviour. The activation energies for phosphate sorption suggested the chemical nature of the given sorption process.
During desorption, the sorption rate parameter was lower than that during the corresponding sorption run, indicating the possibility that the sorted phosphate might have undergone transformations that render it less susceptible to release.
Keywords
Phosphate Sorption/Desorption Kinetics, Modified Freundlich-Type of Kinetic Equation, Elovich Equation, Soil Organic Matter and Hydrous Sesquioxides.- Luerssenia Kuhn - a New Generic Fern Record from the Nicobar Islands, India
Abstract Views :135 |
PDF Views:120
Authors
Affiliations
1 Botanical Survey of India, Howrah, IN
1 Botanical Survey of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 32, No 1-4 (1990), Pagination: 178-180Abstract
No Abstract.Full Text
- Asplenium × Germanicum Auct., a Fern Hybrid, Rare in India
Abstract Views :281 |
PDF Views:134
Authors
A. Datta
1,
R. K. Ghosh
1
Affiliations
1 Botanical Survey of India, Howrah, IN
1 Botanical Survey of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 27, No 1-4 (1985), Pagination: 158-160Abstract
Asplmium × Germanicum auct., a rare and little known taxon in Indian flora, is reported from Kashmir and described as there is no standard description available in the published form.Full Text
- New Records of Seven Ferns from Bastar District, Madhya Pradesh
Abstract Views :143 |
PDF Views:115
Authors
Affiliations
1 Botanical Survey of India, Howrah, IN
1 Botanical Survey of India, Howrah, IN
Source
Nelumbo - The Bulletin of the Botanical Survey of India, Vol 22, No 1-4 (1980), Pagination: 226-227Abstract
No Abstract.Full Text
- Monitoring Efficacy of Constructed Wetland for Treating Domestic Effluent-Microbiological Approach
Abstract Views :258 |
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Authors
Affiliations
1 ICRISAT Development Center, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
1 ICRISAT Development Center, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1710-1715Abstract
Water scarcity and elevated potential in wastewater treatment in the last decades raise attention towards constructed wetlands (CWs). The present study was carried out to evaluate the efficacy of CW for faecal coliform (FC) expulsion and to isolate and characterize the microbial communities. Significant differences were observed between influent and effluent microbial counts of vegetated and control cells (without vegetation) of wetland. FC reduction ranged from 64% to 81%; however, total bacterial, fungal and actinomycetes average poll ranged from 66.67 × 105 cfu/g to 142.67 × 105 cfu/g, 1.67 × 102 cfu/g to 10.33 × 102 cfu/g and 16.00 × 103 cfu/g to 53.33 × 103 cfu/g respectively, isolated from vegetated and control cells. Results further indicated that bacteria were most abundant, followed by actinomycetes, whereas the number of fungi was least among three groups of microbes, which could be attributed to wide tolerance to the properties of CW. Removal of FC was less apparent initially compared to the later stages of operation, which is of concern for long-term efficiency and stability of wetland. Also, diversity of identified bacterial strains is beneficial for growth and yield enhancement of agriculture crops. The results also demonstrate that CWs are the key habitats for bioactive actinomycetes with paramount medical, scientific and economic potential significance globally in general and developing countries like India in particular. Overall, backwash imparts the baseline compilation of CWs for its management for sustainable agriculture.Keywords
Actinomycetes, Bacteria, Constructed Wetland, Faecal Coliform, MPN.Full Text
References
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- Ningthoujam, D. S., Sanasam, S. and Nimaichand, S., Screening of Actinomycete isolates from niche habitats in Manipur for antibiotic activity. Am. J. Biochem. Biotechnol., 2009, 5, 221–225.
- Collins, B., McArthur, J. V. and Sharitz, R. R., Plant effects on microbial assemblages and remediation of acidic coal pile runoff in mesocosm treatment wetlands. Ecol. Eng., 2004, 23, 107–115.
- Weber, K. P., Gehder, M. and Legge, R. L., Assessment of changes in the microbial community of constructed wetlands mesocosms in response to acid mine drainage exposure. Water Res., 2008, 42, 180–188.
- Field Scale Evaluation of Seasonal Wastewater Treatment Efficiencies of Free Surface-Constructed Wetlands in ICRISAT, India
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Authors
Affiliations
1 International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
1 International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1756-1763Abstract
The disparity between volume of wastewater generated and treated has resulted in severe water pollution and eutrophication of the water bodies in most Indian cities. Constructed wetlands (CWs) present a low-cost wastewater treatment option; however, field scale studies with real life wastewater are limited. Eichhornia crassipes (water hyacinth), Typha latifolia (Typha) and Pistia stratiotes (water lettuce) grow abundantly in eutrophicated water bodies, and are known for their nutrient uptake ability. In the present study, the wastewater of a nearby urban residential colony was treated by two-field scale free water surface CWs operating under identical hydraulic loading. The first treatment cells, in each of these two CWs were vegetated with Typha. The second treatment cells were vegetated with water hyacinth (CW-1) in one of the CWs and with water lettuce (CW-2) in the other. Wastewater treatment efficiencies of these free water surface CWs were evaluated, in terms of the removal efficiencies for key parameters, viz. chemical oxygen demand (COD), ammoniacal and nitrate nitrogen, phosphate, sulphate and total suspended solids (TSS). The CW-1 showed greater seasonal variation in performance. A steady removal efficiency of 35-40% was observed for ammoniacal nitrogen in both the free water surface CWs throughout the year, though removal efficiency of nitrate nitrogen reduced significantly during the winter. Plant sample analysis showed that the N, P and K uptake capacities of water lettuce were 1.53, 1.55 and 1.34 times higher than that of water hyacinth, for identical wastewater loading. The dry weight of the harvested biomass for water lettuce, during summer months, was much higher at 5.63 g/m2/d compared to 3.8 g/m2/d for water hyacinth.Keywords
Constructed Wetland, Domestic Wastewater, Field Scale, Free Water Surface, Macrophytes.Full Text
References
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- Evaluating Wastewater Treatment Efficiency of Two Field Scale Subsurface Flow Constructed Wetlands
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PDF Views:105
Authors
Affiliations
1 International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
1 International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, IN
Source
Current Science, Vol 110, No 9 (2016), Pagination: 1764-1772Abstract
Constructed wetlands (CWs) are human-made systems designed to treat a variety of industrial, domestic and agricultural wastewaters. We study here the efficiency of domestic wastewater treatment by two field scale subsurface flow CWs under different hydraulic loading rates (HLRs). Each CW had inlet and outlet chamber for wastewater collection with Pistia stratiotes (water lettuce), two treatment sections consisting of sand and gravel media and four plant species Typha latifolia (Broadleaf cattail) and Cymbopogon citratus (lemon grass - first CW) and (Pennisetum purpureum schum and Pennisetum americanum L (Hybrid napier) and Urochloa mutica (Paragrass - second CW). The wastewater source was from a residential urban colony. The HLRs for the first and second CW for a three-month period averaged 4.45 cm/day and 5.77 cm/day respectively. The CW was monitored for quality of wastewater inflows and outflows and nutrient accumulation in plants and sand media. Results showed that the chemical oxygen demand (COD), total suspended solids (TSS), total nitrogen and total phosphate removals in the first and second CW over a three-month period averaged 42%, 74%, 39% and 41% and 34%, 82%, 14% and 35% respectively. Both the CWs showed similar rates of TSS removal irrespective of the type of wetland plant species. Over the three-month period, average COD, total nitrogen and the phosphate removals were greater in the first CW compared to the second CW. These results confirm the efficacy of field scale subsurface flow CWs to improve the quality of domestic wastewater in rural communities of developing countries like India.Keywords
Constructed Wetlands, Domestic Wastewater, Field Scale, Subsurface Flow.Full Text
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- On Some Aspects of the Computer Aided Analysis of Town Structures used in Wind Mills
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Authors
Affiliations
1 Department of Mechanical Engineering, Jadavpur University, Calcutta-700 032, IN
1 Department of Mechanical Engineering, Jadavpur University, Calcutta-700 032, IN
Source
Journal of the Association of Engineers, India, Vol 56, No 1-4 (1981), Pagination: 75-81Abstract
The computer aided analysis could be used for designing various types of skeletal and continuum structures giving triple benefit to the designers-reduction of design cost, time and accuracy of results. However, such application should be made systematically and carefully- Wild usage of computers without proper evaluation of the users' requirement and without certain inbuilt safety devices in the application packages, may result to the failure and consequent unpopularity of the method. This is particularly important because of the fact that design engineers in our country as a community are not yet fully exposed to the powerful tool of analysis- The authors in this paper have tried to highlight this with a particular example of a tower structure commonly used in wind mills, hereafter called'wind-tower.