A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Tewari, A. K.
- Remote Sensing Delineation of Zones Susceptible to Seismically Induced Liquefaction in the Ganga Plains
Authors
1 Department of Earth Sciences. University of Roorkee, Roorkee-247667, IN
2 Department of Earth Sciences, University of Roorkee, Roorkee-247667, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 1 (1995), Pagination: 75-82Abstract
Liquefaction in saturated sandy soils as a result of earthquake-induced shaking, poses a major threat to men and materials. Many parts of the Indo-Gangetic plains have experienced such catastrophes repeatedly. The border region of southern Nepal-northern Bihar (India) is a typical existing setting prone to soil liquefaction in the Indo-Gangetic Plains. The Bihar-Nepal earthquake of 1934 (Ms>8) and the earthquake of 1988 (Mb = 6.7) induced extensive liquefaction in the terrain in living memory. Characteristics of soil in this area of nothern Bihar have been determined from field samples. Various parameters (e.g. clay content, D50 - and C-values) indicate high susceptibility to liquefaction among soils in the area.
A close study of remote sensing data (Landsat TM and MSS) products reveals that the boundaries of liquefaction zone in the Bihar-Nepal region during the 1934 earthquake are identifiable on the remote sensing images. This is due to a combination of several inter-related factors, such as landform, soil type, soil moisture and vegetation. These clues have been applied as guides on the adjoining remote sensing images for delineating areas on a regional scale, where liquefaction might possibly occur in the Ganga plains, in the event of future Himalayan earthquakes.
Keywords
Earthquakes, Ganga Plains, Remote Sensing, Seismology.- Evaluation of Bioagents for their Compatibility in the Development of Consortium for Enhanced Efficacy
Authors
1 Department Plant Pathology, College of Agriculture, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar - 263145, Uttarakhand, IN
Source
Journal of Biological Control, Vol 34, No 2 (2020), Pagination: 164-167Abstract
The concept of development of microbial consortia for bio-control relies on the fact that bioagents under natural habitats live in communities with some benefits for plants. Application of bioagents in a consortium may improve efficacy, reliability and consistency of the bioagents even under diverse soil and environmental conditions. Diversity in biocontrol mechanisms offered by each bioagent in consortium may help in enhancing disease suppressiveness and may also strengthen the capabilities of the partners in an additive or synergistic manner. Till now no guideline has been published for the evaluation of bioagents to test their compatibility before developing bioagent consortium. In the present studies compatibility among biocontrol potential Trichoderma-Pseudomonas and Trichoderma-Trichoderma isolates was studied by dual culture, mixed formulations and using cell free cultures. In dual culture all the combinations (14 no.) were found compatible with each other as no isolate inhibited the growth of one-another i.e. absence of inhibition zone. All the mixed formulations of potential Trichoderma-Pseudomonas isolates (8 no.) were found compatible with each other as they were growing simultaneously on PDA without antagonizing the growth of other or formation of inhibition zone in their combinations. The cell free cultures of each Trichoderma and Pseudomonas isolates tested with each other using Food Poison Technique showed synergistic effects on their fresh mycelial weight among some combinations while majority showed no significant differences with their checks. Further all the combinations (14 no.) were tested for their effects on seed germination and vigour index of chickpea in glasshouse. All the combinations showed significantly better seed germination while some combinations viz. Th14+Psf173, TCMS36+Psf173,Th17+Th19,Th17+Psf2,Th17+TCMS36 and Th14+Psf2 showed better plant vigour index (43.5 to 44.9% ) as compared to their checks (28.8 to 41.5%).These guidelines could be used before developing bioagent consortium and evaluation in field for crop health management.
Keywords
Chickpea, Microbial Consortia, Trichoderma harzianum, Pseudomonas fluorescens.References
- Arras G, Arru S. 1997. Mechanism of action of some microbial antagonists against fungal pathogens. Ann Microbiol Enzymol. 47: 97-120.
- Dandurand LM, Knudsen GR. 1993. Influence of Pseudomonas flourescens on hyphal growth and biocontrol, activity of Trichoderma harzianum in the spermosphere of pea. Phytopathol. 83: 265-270. https://doi.org/10.1094/Phyto-83-265
- Elad Y, Freeman S. 2002. Biological control of fungal plant pathogens. In: The Mycota XI: Agricultural Applications. Kempken, Springer-Verlag, Berlin, Germany
- Hubbard JP, Harman GE, Hadar Y. 1983. Effect of soil borne. Pseudomonas spp. on the biological control agent, Trichoderma hamatum. on pea seeds. Phytopathology 73: 655-659.https://doi.org/10.1094/Phyto-73-655
- Jhumishree M, Singh SN, Sonkar SS. 2018. Growth promotion of chickpea plant on treatment with native isolates of Trichoderma spp. J Pharmacog Phytochem. 7: 1631-1636
- Kharb RPS, Lather BPS, Deswal DP. 1994. Prediction of field emergence through heritability and genetic advance of vigour parameters. Seed Sci Technol. 82: 461-466.
- Manjula K, Krishna Kishore G, Girish AG, Singh SD. 2004.Combined application of Pseudomonas fluorescens and Trichoderma viride has an improved biocontrol activity against stem rot in groundnut. Plant Pathol J. 20: 75-80. https://doi.org/10.5423/PPJ.2004.20.1.075
- Raupach GS, Kloepper JW. 1998. Mixtures of plant growth-promoting rhizobacteria enhance biological control of multiple cucumber pathogens. Phytopathology 88: 1158-1164. https://doi.org/10.1094/PHYTO.1998.88.11.1158 PMid:18944848
- Rini CR, Sulochana KK. 2007. Usefulness of Trichoderma and Pseudomonas against Rhizoctonia solani and Fusarium oxysporum infecting tomato. J Trop Agric.45:21–28.
- Sharma T, Navin K, Nishant R. 2012. Isolation, screening and characterization of PGPR isolates from rhizosphere of rice plants in Kashipur region (Tarai region). Biotechnol Int. 5: 69–84.
- Sivakumar D, Wijeratnam RSW, Wijesundera RLC, Marikar FMT, Abeyesekere M. 2000. Antagonistic effect of Trichoderma harzianum on post harvest of Rambutan, (Nephelium lappaceum) Phytoparasitica 28: 240247. https://doi.org/10.1007/BF02981802 https://doi.org/10.1007/BF02981802
- Thakkar A, Saraf M. 2015. Development of microbial consortia as a biocontrol agent for effective management of fungal diseases in Glycine max L. Arch Phytopathol Plant Prot. 48: 459-474. https://doi.org/10.1080/03235 408.2014.893638