Browsing by Author "George V. Thomas"
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Item Agro-management Practices for Sustainable Coconut Production(2018) George V. Thomas; Krishnakumar, V.; Dhanapal, R.; Srinivasa Reddy, D.V.Item Allelopathic effects of root and leaf leachates of coconut on selected beneficial microorganisms from coconut rhizosphere(Allelopathic Journal, 2006) Murali Gopal; Alka Gupta; Sunil, E.; George V. ThomasItem Amplification of Plant Beneficial Microbial Communities During Conversion of Coconut Leaf Substrate to Vermicompost by Eudrilus sp.(2009) Murali Gopal; Alka Gupta; Sunil, E.; George V. ThomasThe population densities of 15 microbial communities in the coconut leaves ? cow manure mixture (10:1 ratio, w/w) and pure cow manure, gut contents of the earthworm, Eudrilus sp., reared on the above substrates and vermicompost produced by the worm were studied. The enumeration was done by dilution plate and most probable number method using several selective and semi-selective microbial media. In the vermicompost produced from coconut leaves ? cow manure (CLV) mixture, 9 out of 15 microbial communities, particularly the plant beneficial ones, were amplified whereas five communities were amplified in case of pure cow manure (CMV). The CLV contained significantly high population of fungi, free-living nitrogen fixers, phosphate solubilizers, fluorescent pseudomonads, and silicate solubilizers. The CMV was preponderant with aerobic heterotrophic bacteria, actinomycetes, and Trichoderma spp. Spore formers were present in similar numbers in both the vermicomposts. Presence of Azotobacter was detected only in CMV. The results obtained in this study suggest coconut leaf litter to be a good alternative for cow manure for the production of vermicompost, especially in the areas where coconut is grown in plenty.Item And now, a new biofertilizer(2007-02-08) Ghai, S.K.; George V. ThomasItem Antagonistic activity of coconut rhizospheric and endophytic Bacillus spp. against Ganoderma applanatum and Thielaviopsis paradoxa(2011) Priya George; Alka Gupta; Murali Gopal; Chandra Mohanan, R.; Litty Thomas; George V. ThomasA screening study was carried out to detect the antagonistic potential of Bacillus spp. against Ganoderma applanatum and Thielaviopsis paradoxa, fungal pathogens of coconut. A total of 327 heat resistant, endospore producing bacilli were isolated from the rhizospheric soil and roots of coconut growing in Kerala, Tamil Nadu, Karnataka, Andhra Pradesh and Maharashtra. All the isolates were tested for antifungal activity against G. applanatum and T. paradoxa by dual cultural technique on nutrient agar medium. The zone of inhibition was measured and percentage of inhibition was calculated. More than 90 % of the rhizospheric and root endophytic isolates were found to effectively inhibit the mycelial growth of G. applanatum, with a maximum inhibition zone of 12 mm and percentage inhibition ranging from 44 to 91. About 86 % of the isolates inhibited the mycelial growth of T. paradoxa, with a maximum inhibition zone of 14 mm and percentage inhibition ranging from 42 to 93. Further tests of potent antagonists revealed that more than one mode of mechanisms like production of chitinase, siderophores, HCN, antibiotics, ammonia, β-1,3- glucanase and salicylic acid may be involved in the antagonistic activities. The results of this study revealed 13 Bacillus spp. having potential for use as biocontrol agents against G. applanatum and T. paradoxa, fungal pathogens of coconut.Item Arecanut Based Cropping/Farming Systems(CPCRI, 2011) George V. Thomas; Krishnakumar, V.; Maheswarappa, H.P.; Ravi Bhat; Balasimha, D.Item Assignment of Function and Homology Modelling of Serk and Lec Proteins in Cocoa(2011) Nithya, S.; Rajesh, M.K.; George V. ThomasItem Assosiation of Diaztropic and plant growth promoting rhizobateria with coconut palm (cocos nucefera L)(6th international PGPR workshop, 2003-10) George V. Thomas; Prabhu, S.R.Item Autochthonous nutrient recycling driven by soil microbiota could be sustaining high coconut productivity in Lakshadweep Islands sans external fertilizer application(2022) Murali Gopal; Alka Gupta; Arunachalam, V.; Maheswarappa, H.P.; George V. Thomas; P. M. JacobItem Basic and Applied Aspects of Vermicompost - Production and Use in Agri-Horticulture and Some Experiences in Vermicomposting of Coconut Plantation Wastes(2011) Prabhu, S.R.; George V. Thomas; Subramanian, P.; Biddappa, C.C.; Radha D. KaleItem Basin management using green manure legumes for root (wilt) affected coconut palms(1990-03) George V. Thomas; Mathew GeorgeItem Basin management using green manure legumes for root (wilt) affected coconut palms(2007-02-08) George V. Thomas; Mathew GeorgeItem Beneficial microbes in the nutrition of coconut(2007-02-08) George V. Thomas; Rohini Iyer; Bopaiah, B.M.The association of beneficial micro-organisms such as nitrogen fixing bacteria, vesicular-arbus-cular mycorrhiza) (VAM) fungi and phosphate solubilisers with the roots and rhizosphere of coconut has been well established. The non-symbiotic Beijerinckia and associative symbiotic Azospirillum are the predominant nitrogen fixing bacteria associated with coconut. The green manure/cover leguime-Rhizobium association can also contribute substantial quantities of biologically fixed nitrogen in the basins and interspaces of coconut. The palm forms symbiotic association with VAM fungi belonging to the four genera viz., Glomus, Gigaspora, Sclerocystis and Acaulospora. Bacteria and fungi capable of solubilising insoluble phosphates are also found in large numbers in rhizosphere of coconut. The research work carried out on beneficial microbes associated with coconut is reviewed and the future areas of research outlined.Item Bespoke microbiome therapy to manage plant diseases(2013-12) Murali Gopal; Alka Gupta; George V. ThomasItem Biochars produced from coconut palm biomass residues can aid regenerative agriculture by improving soil properties and plant yield in humid tropics(2021) Murali Gopal; Alka Gupta; K. Shahul Hameed; Neenu, S; T. H. Khadeejath Rajeela; George V. ThomasItem Biodiversity in coconut for rich dividends(2010) George V. Thomas; Niral, V.Item Biological nitrogen fixation by asymbiotic and nonleguminous symbiotic systems(1993) George V. ThomasItem Bioresource management for organic farming in coconut under coastal ecosystem(2004) George V. Thomas; Prabhu, S.R.; Subramaniam, P.Item Central Plantation Crop Research Institute, Kasaragod(2012) George V. Thomas