Nitrogen Fertilizer Effects on Nitrous Oxide Emission from Southwest Brazilian Amazon Pastures

Mazzetto, André Mancebo; Barneze, Arlete Simões; Feigl, Brigitte Josefine; Cerri, Carlos Eduardo Pellegrino

doi:10.4172/2471-2728.1000167

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…That results in significant environmental pollution issues related to fertilizer residuals, including mineral nitrogen among the largest contaminant of croplands (Luis et al, 2014;Khan et al, 2018), as more than 50% of the total amount of applied nitrogen can be lost from agricultural systems (Vitousek et al, 1997;Tilman, 1998). In addition to the nitrate pollution, nitrogen fertilizers are the main source of N 2 O emissions from agriculture, accounting for 60-80% of emissions globally (Dalal et al, 2003;Signor et al, 2013;Mazzetto et al, 2016;Millar et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Biological Nitrogen Fixation and Denitrification in Rhizosphere of Potato Plants in Response to the Fertilization and Inoculation

Volkogon

Dimova

Volkogon

et al. 2021

Front. Sustain. Food Syst.

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The study aim was to evaluate the potential nitrogen fixation and denitrification in the rhizosphere soil of potato plants, crop yield and output quality in response to the different fertilization systems and the inoculation with Azospirillum brasilense 410. Field stationary experiment was conducted between 2016 and 2019 with potato in a crop rotation system on leached chernozem soil. Farmyard manure, 40 t/ha, applied prior to potatoes planting promotes nitrogen fixation (0.8–2.0 times compared to control). However, it has also affected denitrification (in 1.4–2.2 times higher compared to control). The lowest rate of mineral fertilizers used in the experiment, N40P40K40, was shown as most environmentally feasible. Under its use the increase of soil nitrogenase activity and low denitrification levels were observed. Same trends were also noted for the medium fertilizer rate, N80P80K80. The highest doses of mineral fertilizers, N120P120K120, substantially affected the denitrification process and reduced the nitrogen fixation activity (in 1.9–2.2 times). The combination of manure with the medium fertilizers rate has also resulted in high denitrification levels, while the soil nitrogen fixation activity has restored only at flowering stage. Crop inoculation with A. brasilense combined with the manure application, has not affected studied processes. However, crop inoculation after the green manure intercropping has shown the growth of nitrogenase activity. Used on the mineral fertilizers background inoculation has activated nitrogen fixation and has ensured the decrease of denitrification levels, subject to the fertilization background. High fertilizer rates have hampered the inoculation efficiency. Inoculation has promoted crop yields on unfertilized and mineral backgrounds or following green manure. Crop inoculation following organic and the organo-mineral backgrounds had no significant effect, probably due to the competition for A. brasilense from microorganisms that have created a competitive environment for A. brasilense. Despite its environmental expediency, inoculation combined with the low fertilizer doses underperforms the action of inoculation combined with the medium fertilizer rates showing the latter as the compromise between the environmental requirements and crop productivity. The use of inoculation has promoted the accumulation of starch and ascorbic acid and has contributed to the reduction of nitrate contents in the tubers of inoculated plants.

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Section: Introductionmentioning

confidence: 99%

Biological Nitrogen Fixation and Denitrification in Rhizosphere of Potato Plants in Response to the Fertilization and Inoculation

Volkogon

Dimova

Volkogon

et al. 2021

Front. Sustain. Food Syst.

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“…Generally, forages require high amounts of fertilisers for suitable growth and development. The grasses in pastures require large amounts of nitrogen (N), resulting in hundreds of kilograms of N fertilisers being applied per hectare, leading to high N losses, and the greenhouse-gas emissions (Signor and Cerri 2013;Mazzetto and Barneze 2016). The development and implementation of new, sustainable technologies for pastures in the Brazilian semi-arid region is needed, and to this end, the selection of new, locally adapted plant growth-promoting bacteria (PGPB) is a promising tool (Hungria et al 2016;da Silva et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Associative diazotrophic bacteria from forage grasses in the Brazilian semi-arid region are effective plant growth promoters

et al. 2019

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The study of plant growth-promoting bacteria (PGPB) can identify outstanding bacteria for crops. For forage grasses adapted to drylands, the selection of PGPB can increase the field performance of pastures. The aim of this study was to isolate, and characterise at molecular, biochemical and symbiotic levels, diazotrophic bacteria obtained from buffel grass (Cenchrus ciliaris), sorghum (Sorghum bicolor) and Tifton 85 (Cynodon spp.) from Brazilian semi-arid region fields. Field-grown plants were collected, and the roots were surface-disinfected, crushed and inoculated in a semi-solid medium. After the formation and confirmation of microaerophilic pellicles, the bacteria were isolated and purified. All bacterial isolates were subjected to nifH gene amplification and identified by their partial 16S rRNA gene sequences. The bacteria were evaluated for the production of auxins and siderophores, calcium phosphate solubilisation, and diazotrophic ability as ‘in vitro’ plant growth-promotion traits. A plant inoculation assay was conducted to assess the plant growth-promotion abilities of the bacterial isolates. Twenty-one bacterial isolates harboured the nifH gene (nifH+), among which nine were obtained from sorghum, eight from buffel grass, and four from Tifton 85. The bacterial isolates were classified as Bacillus (8), Stenotrophomonas (7), Agrobacterium (4), Cellulomonas (1) and Paenibacillus (1). All were shown to be auxin producers, with 14 isolates showing diazotrophic capacity ‘in vitro’. Fourteen isolates increased plant N content, but the bacterial strains ESA 392 and ESA 398 (Bacillus), ESA 397 and ESA 407 (Stenotrophomonas), and ESA 401 (Agrobacterium) were shown to promote both plant growth and N nutrition. These strains are candidates for further assays to evaluate their agronomic performance under field conditions, aiming inoculant production for forage grasses in drylands.

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Nitrogen emissions in Latin America: A conceptual framework of drivers, impacts, and policy responses

Cunha-Zeri

Ometto

2021

Environmental Development

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Nitrogen Fertilizer Effects on Nitrous Oxide Emission from Southwest Brazilian Amazon Pastures

Cited by 3 publications

References 20 publications

Biological Nitrogen Fixation and Denitrification in Rhizosphere of Potato Plants in Response to the Fertilization and Inoculation

Biological Nitrogen Fixation and Denitrification in Rhizosphere of Potato Plants in Response to the Fertilization and Inoculation

Associative diazotrophic bacteria from forage grasses in the Brazilian semi-arid region are effective plant growth promoters

Nitrogen emissions in Latin America: A conceptual framework of drivers, impacts, and policy responses

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