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M. Sc. Dissertations

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2007 - 20082
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Author: Dinesh Kumar × End date: 2009 × Start date: 2004 ×
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    ThesisItemOpen Access
    Development of microbial inoculant for the growth of Ashwagandha (Withania angustifolia)
    (CCSHAU, 2007) Dinesh Kumar; Yadav, K.S.
    A total of 104 isolates of rhizobacteria were obtained from rhizosphere and rhizoplane of Ashwagandha plants collected from three locations of Haryana. Of these 36 were from rhizosphere and 68 were from rhizoplane. All the isolates were screened for their growth promoting activities in terms of biomass production in sandy soil without addition of any organic or inorganic fertilizers. Inoculation with these isolates produced more plant biomass than control to a varying level. Only four isolates (HRP-7, RRP-8, and RRP-26 & YRP-11) produced plant biomass more than 10 g /plant. Highest plant biomass was produced by inoculation of isolate YRP-11 (16.49 g/plant) followed by RRP-26 (15.86 g/plant). Isolate HRP-7 produced least plant biomass. Isolates selected on the basis of higher plant biomass production showed useful traits like nitrogen fixation, and production of growth promoting substances like indole acetic acid. Inoculation with selected isolates increased plant biomass more in presence of farmyard manure than without farmyard manure. Mixture of these isolates produced biomass at par with mixed biofertilizer formulation containing Azotobacter and phosphorus solubilizing bacteria.
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    ThesisItemOpen Access
    Management of mustard aphid, lipaphis erysimi (Kaltenbach) infesting rapeseed-mustard
    (CCSHAU, 2008) Dinesh Kumar; S.P.Singh
    An experiment was conducted during the ‘Rabi’ season 2006-07 at Chaudhary Charan Singh Haryana Agricultural University, Hisar. Sixty five promising Brassica genotypes were grown to find out their relative resistance/susceptibility to mustard aphid, Lipaphis erysimi (Kalt.). The sowing was done in Randomized Block Design on November 24, 2006. Based on pooled average of aphid infestation index of full flowering and full pod formation stages, out of sixty five promising Brassica genotypes, six Brassica genotypes (NDR-05-1, ONK-1, NRCKR-299, Kiran, RW-2-2 and T-27) were found highly resistant having aphid infestation index (AII) less than one. Generally, genotypes having greenish-yellow colour of flowers, semicompactness and loose arrangement of flower buds on inflorescence twig (RK- 9501, RH-7846, Purple Mutant, T-27 and DLSC-2) were found resistant to mustard aphid incidence. The bio-chemical constituents i.e., rich amount of total nitrogen and total sugars in various plant parts based on pooled mean favoured the multiplication of mustard aphid over Brassica genotypes, whereas, rich amount of glucosinolate, phenol and waxes in various plant parts based on pooled mean had deleterious impact on mustard aphid infestation. The genotypes, RH-7846, Purple Mutant, T-27 and DLSC-2 have the high amount of glucosinolate, thus harboured low aphid population as compared to BSH-1, YST-151 and JMM-927. The amount of total nitrogen and total sugars had positive and significant correlation with mustard aphid infestation, whereas, the amount of glucosinolates, phenols and waxes had deleterious impact on mustard aphid infestation and had negative significant correlation to mustard aphid except waxes. Application of oxydemeton-methyl 0.025% and neem oil 3% gave maximum aphid mortality (96 per cent and 56 per cent) and maximum yield (2520 kg/ha and 2350 kg/ha), respectively as well as maximum yield increased over control was 26 and 17.5 per cent, in mustard variety RH-30. The avoidable yield losses due to aphid infestation in three different Brassica genotypes (T-27, RH-8812 and HNS-9605) were determined and varied from 10.9 to 15.3 per cent, it being the lowest (10.9%) in T-27 and highest (15.3%) in RH-8812. Irrespective of the genotypes the crop under protected conditions (Oxydemeton-methyl 0.025%) gave 14.0% higher yield than un-protected conditions.