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2000 - 2009102
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Subject: Agricultural Microbiology × End date: 2009 × Start date: 2000 ×
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Now showing 1 - 9 of 102
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    ThesisItemOpen Access
    EFFECT OF CO-INOCULATION OF BRADYRHIZOBIUM AND PHOSPHATE SOLUBILIZERS ON THE GROWTH AND YIELD OF GREENGRAM (vigna radiata (L.) Wilczek)
    (University of Agricultural Sciences, Dharwad, 2003) GANI, PARASHURAM; EMMIMATH, V S
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    ThesisItemOpen Access
    COMPOSTING OF WOOD WASTE GENERATED IN A PAPER MILL AND ITS NUTRIENT ENRICHMENT
    (University of Agricultural Sciences, Dharwad, 2003) SHARATH S., S; JAGADEESH, K S
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    CHARACTERIZATION OF ENDORHIZOSPHERE DIAZOTROPHIC BACTERIA AND THEIR INFLUENCE ON GROWTH AND YIELD OF MAIZE PLANTS
    (University of Agricultural Sciences, Dharwad, 2003) NAIKAR, R B; ALAGAWADI, A R
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    SCREENING OF WINE YEASTS AND POMEGRANATE (Punica granatum L.) CULTIVARS FOR WINE PRODUCTION
    (University of Agricultural Sciences, Dharwad, 2002) MATAPATHI, SHASHIKANTAYYA S.; PATIL, A. B.
    Experiments were conducted to screen efficient wine yeasts and pomegranate cultivars suitable for quality wine production. Ten yeast strains isolated were compared with reference strain of Saccharomyces ellipsoideus No. 101 and found that strain FWY-4 and FWY-6 were shown to be good with respect to assimilation of different carbon sources and • growth on YEPD broth. However, highest alcohol tolerance (8.3%) was exhibited by reference strain followed by FWY-4 (8.25%) and FWY-6 (7.80%). Saccharomyces ellipsoideus No. 101 produced maximum alcohol content in wine when inoculated to Ganesha variety of pomegranate fruits but it contained least amount of tannins and esters. The wine from Kesar variety recorded maximum, aldehydes and proteins while Arakta wine had highest amount of NPK. The branded wines when produced by blending Ganesha wine and Arakta wine in the ratio of 2:1 showed highest acceptability with better organoleptic characteristics. However the wine from Arakta variety alone had overall better acceptability inoculated with Saccharomyces ellipsoideus No. 101.
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    ThesisItemOpen Access
    EFFECT OF FOLIAR INSECTICIDES ON SOIL MICROORGANISMS AND THEIR BIOCHEMICAL PROCESSES IN SOILS OF GULBARGA
    (University of Agricultural Sciences, Dharwad, 2000) LAKSHMIKANTHA, H C; KULKARNI, J H
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON ETHANOL PRODUCTION FROM AGRO-RESIDUES
    (University of Agricultural Sciences, Dharwad, 2004) GAURAV, MANJUNATH S; SHIRNALLI, GEETA
    Environmental pollution and demand for energy are the major challenges that the world is facing today, this is due to increase in population and the advances in technologies. Therefore, ethanol is being blended with petrol or diesel @ 20% for conserve the natural resource and decrease the pollution. 90 per cent of the ethanol is being currently produced from molasses. However due of its higher cost, it is necessary to search an alternate source that is cost effective. According to the statistical analysis, paddy, wheat and sugarcane are the major crops in India. Hence, the present study was conducted to know the potential of these three crop residues for ethanol production. The crop residues were subjected to microbiological and crude enzyme pretreatment to obtain maximum reducing sugars. Among these pretreatment methods combined inoculation of Phanerochaete chrysosporium and Pleurotus spp in paddy straw (1.27 mg g'1) and bagasse (1.97 mg g"1) and combined inoculation of Trichoderma viride and Phanerochaete chrysosporium (1.47 mg g'1) in wheat straw was found to be effective in releasing the reducing sugar compared to enzymatic pretreatment. Hence, microbiological pretreatment along with respective substrates were subjected for further studies on ethanol production. The substrates were further subjected to fermentation of filtrates and fermentation along with the solid substrates.Among these, filtrate fermentation showed maximum release of ethanol (820.80 mg L"1) and Zymomonas mobilis was efficient in releasing ethanol from all the substrates. Among the substrates, bagasse recorded maximum release of ethanol compared to paddy straw and wheat straw. Thus, it can be concluded that fermentation of microbiologically pretreated filtrate of bagasse using Zymomonas mobilis is the best method for ethanol production.
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    ThesisItemOpen Access
    BENEFICIAL RHIZOSPHERE MICROFLORA OF BLACK PEPPER (Piper nigrum L.) AND THEIR ROLE IN GROWTH OF THE PLANT
    (University of Agricultural Sciences, Dharwad, 2000) Ranjitha, K; Kulkarni, J H
    Investigations were carried out on the native population o f beneficial microrganisms in the rhizosphere o f black pepper and inoculation effect of selected isolates on the rooting and growth of the plant in nursery. The rhizosphere samples were collected from Sirsi and Coorg regions in Kamataka and Kasargod district in Kerala. The study revealed a higher population of free living nitrogen fixers in rhizosphere soil, Azospirillum in endorhizosphere and percent root colonization (PRC) of vesicular arbuscular mycorrhiza (VAM) in samples collected from Coorg and Sirsi regions. But, the average number of phosphate solubilizers maintained the same level in all the major locations. Correlation studies revealed a significant association of soil organic carbon with population of Azospirillum in the endorhizosphere, PRC of VAM and the free living nitrogen fixers in soil. The available nitrogen positively correlated with PRC ofVAM. The significant correlation oiAzospirillum with phosphate solubilizers confirmed the synergism among these microorganisms. Thirty eight isolates of Azospirillum and 31 isolates o f phosphate solubilizers were obtained in this study. The nitrogen fixation efficiency of Azospirillum isolates ranged from 9.4 to 23.7 mg N2/ g malate used and the _ phosphate solubilizing efficiency o f the phosphate solubilizers varied from a Pi release of 8.1 to 19.1 mg/ 100ml Pikovskaya's broth.In vitro screening of the isolates for phytohormone synthesis indicated the varying efficiency among the isolates and a Azospirillum isolates as superior ones. Inoculation of pepper cuttings with Azospirillum cultures prior to planting resulted in an improved rooting percentage and better root growth compared to control. Single and dual inoculation of Azospirillum and phosphate solubilizing bacteria improved the vigour and nutrient status of the black pepper plants. The Azospirillum stiains AZBR 9 and the phosphate solubilizer BRPS 16 was found to be superior in vivo.
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    ThesisItemOpen Access
    INFLUENCE OF DIFFERENT LEVELS OF VA MYCORRHIZAL INOCULUM ON GROWTH AND YIELD OF ONION (Allium cepa L.)
    (University of Agricultural Sciences, Dharwad, 2000) Hulkoti, Iranna, D; Sreenivasa, M N
    A pot experiment was carried out to find out the minimum number of infective propagules (IP) required for initiating VA mycorrhizal colonization and to study the influence of different levels of Acaulospora laevis and Gigaspora margarita inoculated to onion cv. Bellary red and N-53 respectively, ranging from 0 to 100 g / 10 kg unsterile black clay soil on sporulation, per cent root colonization, population of P-solubilizers, free living N2 fixers, growth and yield parameters. The results of this experiment revealed that, the minimum number of I.P. per g inoculum to initiate root colonization was 0.19 I.P per g of G.margarita in onion cv. N-53 and 1.8 I.P. per g of A.laeuis in onion cv. Bellary red. If the number of infective propagules per g was less th an the above figures, no colonization occurred. All microbiological parameters were found better with inoculation of efficient VA mycorrhizal inoculum in both the cultivars, as compared to uninoculated control plants. The spore count, per cent root colonization, population of p-solubilizers and free living N2 fixers increased significantly with the increase in the level of inoculum upto 50 g per 10 kg soil and the age of the host, except spore count which increased significantly beyond 50 g also. But all these parameters increased up to 80 days after transplantation (DAT) in both the onion cultivars and decreased a t 120 DAT. The alkaline phosphatase and dehydrogenase activities, shoot P concentration, plant height, p lan t dry weight, mycorrhizal inoculation effect, quality and yield parameters increased significantly with the increase in the level of inoculum upto 50 g per 10 kg soil and the age of the host, beyond which further increases in these parameters were found to be non significant in both the cultivars.
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    ThesisItemOpen Access
    MINERAL PHOSPHATE SOLUBILIZATION BY FLUORESCENT PSEUDOMONADS
    (University of Agricultural Sciences, Dharwad, 2000) Deepa, R; Alagawadi, A R
    Abstract Not Available