تلخیص
This field experiment on fababean was conducted with three rates of N (20, 100 and 200 kg/ha) as urea (labeled with 5%, 1% and 0.5% l3N a.e. respectively) and barley was grown as reference crop. Results showed that fababeans receiving lower N level were efficient symbiotic fixers, deriving 84% of their shoot N through symbiotic fixation. Although higher level of N fertilizer resulted in less N2 fixation, fababeans receiving 200 kg N ha'1 were still able to fix sufficient N2 indicating that fababean Rhizobia were tolerant of higher soil N. The results also showed that fababeans appeared to preferentially feed from combined inorganic soil and N fertilizer(urea) rather than symbolically fix their needs.
Haq Nawaz . (1995) EFFECT OF NITROGEN FERTILIZER RATES ON DRY-MATTER YIELD AND SYMBIOTIC NITROGEN FIXATION BY FABABEANS , The Journal Soil & Environment , Volume 10, Issue (1-4).
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