Browsing by Author "Ghai, S.K."

Now showing 1 - 11 of 11
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    And now, a new biofertilizer
    (2007-02-08) Ghai, S.K.; George V. Thomas
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    Individual and interactive effects of VA mycorrhizal fungi and root-knot nematode, Meloidogyne incognita, on cardamom
    (1989-01) George V. Thomas; Sundararaju, P.; Ali, S.S.; Ghai, S.K.
    The effect of inoculation with six species of vcsicular-arbuscular (VA) mycorrhizal fungi individually and in different combinations with the root-knot nematode, Meloidogyne incognita, simultaneously and sequentially, on cardamom was studied at 6 and 12 months after inoculation. Compared with the control, the growth of cardamom plants was significantly improved by inoculation with VA mycorrhizal fungi, whereas nematode inoculation reduced it. The growth response induced by VA mycorrhizal fungi was similar when inoculation was made simultaneously and after nematode inoculation. VA mycorrhizal fungi significantly reduced the nematode population in roots. Colonization of roots by VA mycorrhizal fungi was also obtained when nematodes were inoculated simultaneously and prior to inoculation by VA mycorrhizal fungi. Gigaspora margarita Becker & Hall and Glomus fasciculatum (Thaxter sensu Gerd.) Gerd. & Trappe were the most effective VA mycorrhizal fungi, able to promote maximum growth response in the absence as well as in presence of root-knot nematodes.
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    Influence of Rhizobium Inoculation and Seed Pelleting on Nodulation of Green Manure Legumes in an Acidic Coconut Soil
    (1991) George V. Thomas; Ghai, S.K.
    The effect of rhizobia inoculation and seed pelleting was studied in an acidic soil on nodulation, N. fixation and growth of green manure legumes which were found to be suitable for cultivation in coconut gardens. Three Rhizobium strains (32 HI, EGI, PAU Cowpea) were used as inoculants for CalopogoIlium muculloides and an IARI strain (Lt) and a local isolate (L2) for Leucaella lellcocephala. The effectiveness of pelleting materials such as rock phosphate, Ca CO,. charcoal and dolomite was compared along with different inoculants. Rhizobium inoculation resulted in increased growth and nodulation in both legumes and the extent of response varied when different cultures were used. The response in nodulation behaviour, dry matter yield and nitrogen concentration in tissues was significantly more only when pelleting was done on Rhizobium inoculated seeds. The difference in response due to the use of different pelleting materials was not significant_ The present study indicated the need for pelleting along with rhizobial inoculation to get substantial improvement in nodulation and nitrogen fixation of green manure legumes in acidic coconut soils.
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    Influence of VA - mycorrhizal inoculation on the growth and phosphorus uptake of cashew seedlings
    (2007-02) Bopaiah, B.M.; Ghai, S.K.; George V. Thomas
    A screening experiment using nine cultures of VA-mycorrhizal fungi was carried out on cashew var. VTH-12. Glomus macrocarpum, G. versiforme and a local isolate C- II (Coconut black) inoculated plants recorded higher shoot and root weight as compared to those inoculated with other VA-mycorrhizal cultures. All the VA - mycorrhizal inoculation treatments resulted in greater plant growth as compared to uninoculated control. The phosphorus content was also more in VA-mycorrhizal inoculated plants. Cashew is generally grown in poor soils which are not auitable for the cultivation of other crops. The plant requires considerable amounts of nutrients for the growth and production. Considerable work have been reported on the association VA-mycorrhizal (VAM) which increases the uptake of P, Zn and Cu and plant growth in annual crops, but not much information is available for The perennial crops except in citrus (Kleinshnidt and Gerdemann, 1972; Krishna et si, 1983; Thapar and Khan, 1986). In the present study, nine VAM cultures were screened for their influence on cashew seedlings.
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    Legume-Rhizobium Interaction for Biological Dinitrogen, Fixation: Its Use as Green Manure
    (1987) Ghai, S.K.; George V. Thomas
    Biological dinitrogen fixation by legume-Rhizobium combination is an excellent example of Plant-Microbe interaction. The beneficial effect of this interaction is derived mainly by two ways, die way is, using the dintitrogen fixing ability of the bacteria for direct benefit of the leguminous plants which gives higher yields of the grains (and also biomass). The other use of this plant-microbe interaction is indirect, which is the topic of this paper. Here the dinitrogen fixed by the legume-Rhizobium interaction is, made available to the cereals and other nonlegumes, which otherwise are unable to enter into similar association with the rhizobia as the legumes. This process is called green manuring where a leguminous plant, which has derived enough benefit from its association with appropriate species of Rhizobium, is ploughed into the soil and then a nonlegume is grown and allowed to take the benefit of the already fixed dinitrogen. Research on green manuring in India and abroad is also reviewed here along with future scope of this practice in the agricultuire.
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    Now, Bio Nitrogen for Coconut Too
    (2007-02) George V. Thomas; Ghai, S.K.
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    Occurrence of Azospirillum spp. in coconut-based farming systems
    (2007-02) Ghai, S.K.; George V. Thomas
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