The effect of combined Azospirillum inoculation and nitrogen fertilizer on plant growth promotion and yield response of the blanket flower Gaillardia pulchella |
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Authors: | Ravi S. Gadagi P. U. Krishnaraj J. H. Kulkarni Tongmin Sa |
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Affiliation: | a Department of Agricultural Microbiology, University of Agricultural Science, Dharwad, Karnataka, India;b Department of Agricultural Chemistry, Chungbuk National University, Cheongju 361-761, South Korea |
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Abstract: | The investigation was carried out to examine the performance of Azospirillum isolates on growth and N uptake of Gaillardia pulchella with two nitrogen levels. Azospirillum strain OAD-2 inoculation significantly increased plant height, number of leaves per plant, branches per plant and total dry mass accumulation in G. pulchella than other inoculations and/or uninoculated control. The application of 150 kg N ha−1 further enhanced the above plant growth parameters significantly over application of 112 kg N ha−1. The N uptake of G. pulchella was enhanced due to Azospirillum strain OAD-2 inoculation, which was further augmented in the presence of nitrogen. The combination of Azospirillum strain OAD-2 and 150 kg N ha−1 showed the highest N uptake at 120 DAT. Plant growth and yield parameters also increased when inoculated with the non-diazotrophic, but efficient IAA producing, Azospirillum strain OAD-57. From this investigation, it can be concluded that Azospirillum strains OAD-2 and OAD-11 can play an important role in the N nutrition of G. pulchella. |
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Keywords: | Author Keywords: Field inoculation IAA Nitrogen fixation PGPB |
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