Dinâmica da emissão de metano em solos sob cultivo de arroz irrigado no sul do Brasil

Silva, Leandro Souza da; Griebeler, Gustavo; Moterle, Diovane Freire; Bayer, Cimélio; Zschornack, Tiago; Pocojeski, Elisandra

doi:10.1590/s0100-06832011000200016

Cited by 20 publications

(10 citation statements)

References 13 publications

(9 reference statements)

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“…In Brazil, CH 4 emission from rice cultivation was estimated to be 0.46 Tg CH 4 in 2010 of a total of 12.42 Tg from the agricultural sector (BrazIl, 2016). local CH 4 measurement studies in flooded rice plantations have been carried out in different climatic regions, soils, and water and crop managements in the country (SIlva et al, 2011;zSCHOrNaCK et al, 2011;MOterle et al, 2013;BaYer et al, 2014;lIMa et al, 2014;BaYer et al, 2015;zSCHOrNaCK et al, 2016). However, few studies have been reported on rice production under pre-germinated system (lIMa et al, 2007;eBerHardt et al, 2009), which is used in some regions of the country.…”

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confidence: 99%

Methane emission from a flooded rice field under pre-germinated system

et al. 2019

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Local greenhouse gas flow measurement studies have been encouraged at a global level as a subsidy for national and state inventories. This study aimed to evaluate the seasonal methane emission during the 2008/2009 harvest, from an irrigated rice plantation, under pre-germinated system, in the municipality of Tremembé, State of São Paulo, using the static chamber technique and gas chromatography. The study showed high seasonal emission of methane (CH4) for the studied area, probably due to the long flooding period. It was estimated the CH4 emission factor (6.2 kg CH4 ha-1 dia-1), the partial global warming potential (pGWP, 26.2 Mg CO2eq growing season-1 ha-1) and the yield-scaled pGWP (YpGWP, 3.9 kg CO2eq kg grain).

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confidence: 99%

Methane emission from a flooded rice field under pre-germinated system

et al. 2019

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“…Continuous flooding promotes the anaerobic soil environment with lower redox potential leading to increase CH 4 emission density [9][10][11] . Application of vermicompost provided substrates for methanogenesis as organic carbon compounds resulted in maximum CH 4 production.…”

Section: Resultsmentioning

confidence: 99%

Methane and Nitrous Oxide Emission from <i>Kharif</i> Rice Field as Influenced by Nutrients and Moisture Regimes in New Alluvial Agroclimatic Region of West Bengal

Saha¹,

Kar²,

Karmakar³

2017

Current Science

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INCREASING population and demand for food are placing unprecedented pressure on agriculture and natural resources 1,2 . Agriculture is estimated to account for 10-12% of anthropogenic emissions of greenhouse gases (GHGs) worldwide, including 60% of global nitrous oxide (N 2 O) emissions and 50% of methane (CH 4 ) emissions 3 . Rice paddies are considered one of the most important sources of atmospheric CH 4 , but they also emit N 2 O and the intensity of emissions is related to the nitrogen (N) fertilizer application rate 4,5 . The increasing demand for rice in the future has raised tremendous concerns about increasing GHG emissions 6,7 . Rice paddies could contribute to more than 80% of CH 4 and N 2 O emissions driven by microbial activities. The application of N fertilizer is one of the primary methods for enhancing rice production. Field measurements have reported that N fertilization significantly stimulated CH 4 and N 2 O emissions 4 , but some studies found reduction in CH 4 emissions with N fertilizer application 8 . Based on these existing data, it is difficult to determine an optimal rate of N fertilization for high productivity while reducing GHG emissions. Thus information regarding factors influencing rice yield and tendency to reduce GHG emissions is urgently needed to aid cropping technique innovation. Furthermore, it is important to explore the relationship between CH 4 and N 2 O emitted from rice fields. Thus the present study is aimed (i) to assess the actual relation between CH 4 and N 2 O emitted from rice and (ii) to scale rice productivity under varied CH 4 and N 2 O emission potentiality.

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“…Para calcular a quantidade de CH4, produzida em cada intervalo de leitura, foi utilizada a seguinte equação: Px i V = n i RT; onde P = pressão do sistema (atmosférica); x i = fração molar do gás; V = volume de gás produzido; ni = número de mols do gás (metano); R = constante dos gases ideais; T = temperatura [13]. Os resultados de volume de gás produzido e da concentração de CH 4 por cromatografia gasosa foram adicionados a equação, sendo assim, foi possível estimar a quantidade de CH 4 produzido nos intervalos de tempo da incubação.…”

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The Effect of Mycotoxins Adsorbents Beta Glucans or Montmorillonite on Bovine Ruminal Fermentation In Vitro

Pozzo

Viégas

Kozloski

et al. 2016

Acta Scientiae. Vet.

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Background: The addition of adsorbents in foods has been the strategy used by nutritionists to reduce the toxic effects of mycotoxins in animals. Mycotoxins are found in a range of foods and commonly they present variations in the chemical structure therefore, it has been appropriate to include adsorbents from different sources in the diet of ruminants. However, few researches were conducted in order to better understand the interaction of adsorbents on ruminal fermentation. Our objective in this study was to investigate the possible effects of two adsorbent products on bovine ruminal fermentation. One consists of 65% of β-glucan (β-glu), originating cell wall of Saccharomyces cerevisiae and used at a concentration of 1% and natural sodium montmorillonite (MMT) at a concentration of 5%. Materials, Methods & Results:The effects of β-glu adsorbents (1%) and MMC (5%) in culture medium that simulated ruminal fermentation were evaluated. Bottles, with a capacity of 120 mL, were used to be filled with substrate such as maize and ryegrass hay ground, nutrient solution (medium of Menke), liquid extracted rumen fistulated bovine and the two adsorbents evaluated, totaling 50 mL. The experiment was conducted with three treatments, named after: control (Cont), β-glu and MMT. In the control treatment adsorbents were not added. Six replicates were used for each treatment and two trials were conducted. One of the tests aimed to determine the fermentation kinetics by means of the gas production after 72 h' incubation and quantifying the production of methane (CH4) at 48h. While another test aimed to quantify the production of short chain fatty acids (SCFA) -acetic, propionic and butyric acid -and the production of ammonia (NH3) in 24 h incubation. All assays were measured by gas chromatography. The highest total SCFA concentration was observed in β-glu treatment (67.71 mM) significantly superior to CONT (57.7 mM) treatment and MMT (53.28 mM), which was significantly lower than the β-glu treatment, but similar to CONT. The average representation (%) of acetic acid for the treatment MMT (62.9%) was significantly higher than the β-glu treatment (61.0%). The average proportions of propionic acid were similar between treatments, while the average representation (%) of butyric acid production was significantly higher for the β-glu treatment (13.1%) compared to CONT treatments (11.3%) and MMT (11.4%). The amount of NH3 was significantly reduced in MMT (9.6 mM) treatment compared to β-glu treatments (12.2 mM) and CONT (11.3 mM). In another test, the greater volume of gas (mL) was produced by β-glu treatment (103.4 mL), which was significantly greater than the treatments CONT (89.0 mL) and MMT (91.6 mL). The lag time, i.e. the time taken by the bacteria inoculum to develop lead-through in the substrate, in the MMT treatment took 6.2 h, slowing significantly compared to CONT treatments (4.8 h) and β Glu (4.33 h). The concentration of CH4 was significantly lower in MMT treatment (33.0%) compared to the CONT treatments (36.3%) and ...

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Dinâmica da emissão de metano em solos sob cultivo de arroz irrigado no sul do Brasil

Cited by 20 publications

References 13 publications

Methane emission from a flooded rice field under pre-germinated system

Methane emission from a flooded rice field under pre-germinated system

Methane and Nitrous Oxide Emission from <i>Kharif</i> Rice Field as Influenced by Nutrients and Moisture Regimes in New Alluvial Agroclimatic Region of West Bengal

The Effect of Mycotoxins Adsorbents Beta Glucans or Montmorillonite on Bovine Ruminal Fermentation In Vitro

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