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- W2010384798 abstract "To assess the variation in symbiotic effectiveness of N 2 -fixing Rhizobium leguminosarum isolates in the presence of NH 4 NO 3 , peas were inoculated with 38 isolates and grown for 4 weeks with weekly additions of 2 mM NH 4 NO 3 . Acetylene reduction was inhibited relative to a N-free control in all isolates but the inhibition varied from 60 to 100%. There were also significant differences (p = 0.05) between isolates with varying inhibition of C 2 H 2 reduction in H 2 uptake, H 2 evolution, and leghemoglobin content. Ten isolates were selected for further study of the importance of NH 4 NO 3 concentration (0, 1,2, and 5 mM) and plant growth stage (3,4, and 5 weeks) to characters associated with N 2 fixation and plant growth. Plant age, NH 4 NO 3 treatment, and isolate were all significant sources of variation (p ≤ 0.01) for each character measured but interactions between these factors were also significant. There were significant differences between isolates in the rate of decrease in C 2 H 2 reduction with increasing NH 4 NO 3 concentration (C 2 H 2 reduction responsiveness to NH 4 NO 3 ) and this responsiveness term was correlated with C 2 H 2 reduction rates at 2 and 5 mM NH 4 NO 3 (p = 0.01). Acetylene reduction rates were correlated with shoot dry weights at 0.1, and 2 mM NH 4 NO 3 (p = 0.001). These results suggest the possibility of enhancing N 2 fixation in peas through selection of rhizobia with maximum effectiveness at low levels of combined nitrogen." @default.
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- W2010384798 date "1983-12-01" @default.
- W2010384798 modified "2023-09-25" @default.
- W2010384798 title "Variation in ability of Rhizobium leguminosarum isolates to fix dinitrogen symbiotically in the presence of ammonium nitrate" @default.
- W2010384798 doi "https://doi.org/10.1139/m83-249" @default.
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