Topic
Nitrogen fixation
About: Nitrogen fixation is a research topic. Over the lifetime, 7940 publications have been published within this topic receiving 232921 citations. The topic is also known as: GO:0009399.
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TL;DR: It is concluded that the suppression of N 2 fixation along the deposition gradient was consistent regardless of the measurement technique, and microbial community changes toward methanotrophic or otherwise acetylene-sensitive N 1 fixation could not explain this trend.
84 citations
TL;DR: There is a general trend in published data towards lower P use efficiency for photosynthetic diazotrophic organisms growing under P limitation with N(2) as their nitrogen source, rather than with NH(4)(+), urea or NO(3)(-).
84 citations
TL;DR: It is demonstrated that infection and/or early nodule development were very sensitive to low RZT, such that only a few days at 19°C, instead of 21°C can make important differences in the time to onset of N 2 fixation and, subsequent N accumulation and plant growth.
84 citations
TL;DR: The potential of native rhizobia isolates to enhance delivery of agroecosystem services including nitrogen fixation and bean production is revealed and further characterization and mapping of the native isolate will be imperative in development of effective and affordable commercial inoculants.
Abstract: Climbing bean (Phaseolus vulgaris L.) production in Kenya is greatly undermined by low soil fertility, especially in agriculturally prolific areas. The use of effective native rhizobia inoculants to promote nitrogen fixation could be beneficial in climbing bean production. In this study, we carried out greenhouse and field experiments to evaluate symbiotic efficiency, compare the effect of native rhizobia and commercial inoculant on nodulation, growth and yield parameters of mid-altitude climbing bean (MAC 13 and MAC 64) varieties. The greenhouse experiment included nine native rhizobia isolates, a consortium of native isolates, commercial inoculant Biofix, a mixture of native isolates + Biofix, nitrogen treated control and a non-inoculated control. In the field experiments, the treatments included the best effective native rhizobia isolate ELM3, a consortium of native isolates, a commercial inoculant Biofix, a mixture of native isolates + Biofix, and a non-inoculated control. Remarkably, four native rhizobia isolates ELM3, ELM4, ELM5 and ELM8 showed higher symbiotic efficiencies compared to the Biofix. Interestingly, there was no significant difference in symbiotic efficiency between the two climbing bean varieties. Field results demonstrated a significant improvement in nodule dry weight and seed yields of MAC 13 and MAC 64 climbing bean varieties upon rhizobia inoculation when compared to the non-inoculated controls. Inoculation with ELM3 isolate resulted to the highest seed yield of 4,397.75 kg ha-1, indicating 89 % increase over non-inoculated control (2,334.81 kg ha-1) and 30 % increase over Biofix (3,698.79 kg ha-1). Farm site significantly influenced nodule dry weight and seed yields. This study, therefore, revealed the potential of native rhizobia isolates to enhance delivery of agroecosystem services including nitrogen fixation and bean production. Further characterization and mapping of the native isolates will be imperative in development of effective and affordable commercial inoculants.
84 citations
TL;DR: Nitrogen inputs, outputs and compartamentalization were quantified in a freshwater fish pond stocked with hybrid Oreochromis throughout a production cycle, finding that nitrogen transformation constituted a major pathway for nitrogen transformation, but only 1% of the nitrogen input was lost through denitrification.
Abstract: Nitrogen inputs, outputs and compartamentalization were quantified in a freshwater fish pond stocked with hybrid Oreochromis throughout a production cycle. The budget accounts for 91% of the nitrogen added to the system. Feed addition accounted for 87% of the nitrogen input and an additional 11% was attributable to nitrogen fixation, mainly in the water column. The balance of the nitrogen input was contained in the source water for the pond. Commercial-size fish accumulated 17.5% of the nitrogen added to the system. Most of the nitrogen was eventually deposited in the sediments. Nitrification constituted a major pathway for nitrogen transformation, but only 1% of the nitrogen input was lost through denitrification.
84 citations