Dynamics of free-living nitrogen-fixing bacterial populations in antagonistic conditions

Kavadia, A.; Vayenas, D.V.; Pavlou, Stavros; Aggelis, George

doi:10.1016/j.ecolmodel.2006.07.037

Cited by 12 publications

(14 citation statements)

References 40 publications

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“…However, the dynamics of N 2 -fixing microbial populations are linked to available C:N ratios. For example, when C is abundant, excess ammonium N can be assimilated by other microbial populations allowing N 2 fixation to occur, but with low C, excess ammonium N concentrations inhibit N 2 -fixing populations [97]. In the presence of large amounts of crop residue with wide C:N ratios, decomposition can be slow.…”

Section: Soil and Environmental Factorsmentioning

confidence: 99%

Enhancing Non-symbiotic N2 Fixation in Agriculture

Roper¹,

Gupta²

2016

TOASJ

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Much of the demand for nitrogen (N) in cereal cropping systems is met by using N fertilisers, but the cost of production is increasing and there are also environmental concerns. This has led to a growing interest in exploring other sources of N such as biological N 2 fixation. Non-symbiotic N 2 fixation (by free-living bacteria in soils or associated with the rhizosphere) has the potential to meet some of this need especially in the lower input cropping systems worldwide. There has been considerable research on nonsymbiotic N 2 fixation, but still there is much argument about the amount of N that can potentially be fixed by this process largely due to shortcomings of indirect measurements, however isotope-based direct methods indicate agronomically significant amounts of N 2 fixation both in annual crop and perennial grass systems. New molecular technologies offer opportunities to increase our understanding of N 2 -fixing microbial communities (many of them non-culturable) and the molecular mechanisms of non-symbiotic N 2 fixation. This knowledge should assist the development of new plant-diazotrophic combinations for specific environments and more sustainable exploitation of N 2 -fixing bacteria as inoculants for agriculture. Whilst the ultimate goal might be to introduce nitrogenase genes into significant non-leguminous crop plants, it may be more realistic in the shorter-term to better synchronise plant-microbe interactions to enhance N 2 fixation when the N needs of the plant are greatest. The review explores possibilities to maximise potential N inputs from non-symbiotic N 2 fixation through improved management practices, identification of better performing microbial strains and their successful inoculation in the field, and plant based solutions.

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Section: Soil and Environmental Factorsmentioning

confidence: 99%

Enhancing Non-symbiotic N2 Fixation in Agriculture

Roper¹,

Gupta²

2016

TOASJ

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“…The increases in plant growth obtained when partial replacement of mineral nitrogen by N-fixing bacteria in presence of compost, might be due to the improvement of physical and chemical properties of soil by adding compost (Mamo et al 1998), which improve soil fertility and biological activity in roots rhizosphere (Glala et al 2010 and 2012). As well as, N-fixing bacteria provide the plant with fixed nitrogen, hormones, signal molecules, vitamins, iron, etc which enhance root growth of plants (Kavadia et al 2007;Mikhailouskaya and Bogdevitch, 2009). All that, play an important role in increasing nutrient availability for uptake which reflected in better root distribution and vegetative growth.…”

Section: Methodsmentioning

confidence: 99%

“…These results were similar in both seasons. These findings might be due to the beneficial effects of Nfixing bacteria that help in increasing nitrogen fixation and other nutrients in rhizosphere, also enhance the production of phytohormone (Kavadia et al 2007;Mikhailouskaya and Bogdevitch, 2009). Moreover, compost has a high cation exchange capacity exceeded the capacity of sandy soil to maintain nutrients are absorbed by plants.…”

Section: Methodsmentioning

confidence: 99%

“…Nitrogen fixing bacteria (NFB) that function transform inert atmospheric nitrogen to organic compounds (Bakulin et al 2007). These bacteria provide the plant with fixed nitrogen, hormones, signal molecules, vitamins, iron, etc (Kavadia et al 2007;Mikhailouskaya and Bogdevitch, 2009). Azotobacter and Azospirillum are the two most important non-symbiotic Nfixing bacteria in non-leguminous crops.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Mineral Nitrogen, Compost and Nitrogen Fixing Bacteria on Tomato Plants Grown in Sandy Soil

El-Moula

Abou-El-Hassan

2015

Arab Universities Journal of Agricultural Sciences

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The present study aims to determine the partial replacement of mineral nitrogen fertilization of tomato by nitrogen fixing bacteria with or without adding compost in sandy soil. Tomato seedlings (Lora F1Hybrid) were transplanted during the first week of October into plastic pots (30 cm diameter) filled with 10 kg of sandy soil. Three rates 25, 50 and 75% of the recommended mineral nitrogen in the nutrient solution for tomato with adding compost at 2% and nitrogen fixing bacteria (Azotobacter chroococcum and Azospirillium brasilense) at 20 ml/plant either individually or in combinations were investigated on growth, mineral composition and yield of tomato plants compared to 100% of recommended nitrogen only (control). The plants were irrigated daily by drip irrigation and received 200 ml/plant of nutrient solution twice a weekly. The results showed that using 50 or 75% of Nmineral fertilizer + compost + nitrogen fixing bacteria gave the highest values of growth, mineral composition and yield of tomato. It is recommended that 50% of nitrogen mineral fertilizers for tomato plants could be replaced by nitrogen fixing bacteria in presence of compost, which in earn, reduce environment pollution caused by extensive application of mineral nitrogen fertilizers.

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“…Biological nitrogen fixation by free-living nitrogen fixing microorganisms occurs in soils by several aerobic (Azotobacter, Beijerinickia) or micro-aerobic (Azospirilum) prokaryotes (Kavadia et al, 2007). These bacteria contain nitrogenase enzyme responsible for the fixation of atmospheric nitrogen (N 2 ), improving the soil fertility (Gothwal et al, 2008).…”

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confidence: 99%