Evaluation of non symbiotic nitrogen fixation by bradyrhizobium in cowpea
| dc.contributor.advisor | Rajendran Pillai, M V | |
| dc.contributor.author | Asha, S | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2019-05-02T10:18:08Z | |
| dc.date.available | 2019-05-02T10:18:08Z | |
| dc.date.issued | 1997 | |
| dc.description | PG | en_US |
| dc.description.abstract | A study was conducetd at the College of Horticulture, Vellanikkara during the year 1993-95 on the evaluation of non-symbiotic nitrogen fixation by Bradyrhizobium in cowpea. Twelve isolates collected from different agroclimatic regions of Kerala, two exotic isolates and one KA U isolate were used for the study. First, a pot culture experiment was conducted to screen the above 15 isolates for their efficiency in non symbiotic nitrogen fixation. Two media and two methods of application were also tried. A second pot culture experiment was also conducted to find out the most suitable method of application of the best performer in terms of foliar nitrogen fixation. The results of the screening experiment showed that no particular isolate was effective in improving any of the parameters observed. However,out of the ten characters studied, isolate liS (KAU isolate) ranked best in improving five characters namely, plant height, number of leaves, dry weight of nodule, fresh weight of plants and nitrogen content. Thus 115 was selected as the promising isolate for the second experiment. Isolate 114 (CB-7 56), which showed next better performance in improving number of leaves, dry weight of nodules and fresh weight of plants was also selected. Moreover, it was one of the known exotic isolates supporting non-symbiotic nitrogenase activity. The results of the second experiment clearly established the superiority of seed (soil) inoculation (AI) of Bradyrhizobium over different methods of foliar application. However, foliar applications also showed improved performance over control plants in improving the different parameters observed. Spraying the bacteria grown in broth shake culture (A3) was found effective in improving the number of leaves, dry weight of roots, chlorophyll content and nitrogen content of plant. The study show that, eventhough less efficient, the foliar application of Bradyrhizobium can also be resorted to in improving the performance of cowpea plants in situations where seed (soil) inoculation is not possible. | en_US |
| dc.identifier.citation | 171421 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810101686 | |
| dc.keywords | Plant pathology, cowpea, bradyrhizobium, nitrogen fixing bacteria | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Department of Plant Pathology, College of Horticulture, Vellanikkara | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | Evaluation study of nitrogen fixing bacteria bradyrhizobium | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Evaluation of non symbiotic nitrogen fixation by bradyrhizobium in cowpea | en_US |
| dc.type | Thesis | en_US |