Untraditional N2-fixing bacteria as biofertilizers for wheat and barley |
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Authors: | M Fayez |
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Institution: | (1) Department of Microbiology, Faculty of Agriculture, Cairo University, Giza, Egypt |
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Abstract: | The screening of 27 isolates grown on nitrogen-free medium for nitrogen-fixing ability resulted in the isolation of five organisms
belonging toBacillaceae, Enterobacteriaceae andPseudomonadaceae. Estimates of N2-fixation efficiencies of these isolates indicated that they may be responsible for low rates of N2-fixation in soil. The possible association of these isolates as well as ofAzotobacter andAzospirillum with wheat and barley was investigated in a greenhouse experiment. The highest values of nitrogenase activity on plant root
were recorded in treatments inoculated with composite inocula of the isolated N2-fixers, particularly whenAzotobacter and/orAzospirillum were added in combination. Inoculation with single inoculum of each of the N2-fixing isolates had no significant influence on plant growth, except withPseudomonas andBacillus for wheat and barley, respectively. Highly significant increases in growth of both plants were recorded in all cases of multistrain
inoculation. |
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