Soil Texture Effects on Methane Emissions From Direct-Seeded, Delayed-Flood Rice Production in Arkansas

Brye, Kristofor R.; Rogers, Christopher W.; Smartt, Alden D.; Norman, Richard

doi:10.1097/ss.0000000000000020

Cited by 43 publications

(35 citation statements)

References 7 publications

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“…Similar studies that examined the effect of sampling location, however, did not observe a significant difference in aboveground dry matter [30,32,48,53]. The difference observed in this study may simply be a factor of chamber placement, where greater plant densities were inadvertently included within the chambers.…”

Section: Aboveground Dry Matter and Grain Yieldmentioning

confidence: 38%

“…Fluxes incrementally decreased again at 6 and 7 DAFR (2.65 and 0.56 mg CH 4 -C m -2 h -1 , respectively). The post-flood-release pulse of CH 4 that occurred in this study has been observed in previous studies [30,32,48,49,53,54,55,56], usually occurring from 3 to 6 DAFR, and is generally attributed to the release of CH 4 from soil pores as they drain and allow transport of previously entrapped gases.…”

Section: Methane Fluxes Following Flood Releasementioning

confidence: 67%

“…Gas sampling throughout the study occurred between 0800 and 1000 hours, similar to previous studies [30,32,48,49,51,52,53], in order to prevent excessive heating within the chambers during sampling. Gas samples for flux measurements occurred on approximately weekly intervals at 7,14,21,28,35,43,49,56,63,71, and 77 days after flooding (DAF) for the flooded duration of the study.…”

Section: Gas Sampling and Analysismentioning

confidence: 87%

“…Gas samples for flux measurements occurred on approximately weekly intervals at 7,14,21,28,35,43,49,56,63,71, and 77 days after flooding (DAF) for the flooded duration of the study. Sampling intensity was increased after flood release to 80, 82, 83, 84, and 85 DAF [i.e., 2, 4, 5, 6, and 7 days after flood release (DAFR)] in an attempt to adequately quantify a post-flood-release pulse of CH4 that has commonly been observed in previous studies [32,48,49,51,54,55,56].…”

Section: Gas Sampling and Analysismentioning

confidence: 99%

“…Enclosed headspace chambers, as detailed by Livingston and Hutchinson [47] and similar to those used in previous studies [30,32,48,49], were used for collection of gas samples. This methodology is commonly used for measuring trace gas fluxes [50] and involves the use of 30-cm inner diameter (ID) polyvinyl chloride to create a permanent base collar, several sizes of chamber extensions to accommodate increasing plant growth over time, and a vented sampling cap to sample a portion of each plot.…”

Section: Gas Sampling and Analysismentioning

confidence: 99%

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Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

A.D.¹,

K.R.²,

R.J.³

2018

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Abstract. Rice (Oryza sativa L.) production systems have a greater global warming potential than upland row crops due to methane (CH4) emissions resulting from anaerobic conditions associated with flood-irrigated soils. Based on recent research indicating the potential for hybrid cultivars to mitigate CH4 emissions from rice, the objective of this study was to determine the influence of several commonly grown hybrid rice cultivars on CH4 fluxes and emissions from a silt-loam soil. Four cultivars were evaluated: the three hybrids CLXL729, CLXL745, and XL753 and the pure-line cultivar Roy J. Methane fluxes were determined by measuring changes in headspace CH4 concentrations over a period of 1 hour using 30-cm-inner-diameter polyvinyl chloride chambers. Only minor differences in CH4 fluxes occurred among the three hybrid cultivars, while the pure-line cultivar (Roy J) generally had greater (P < 0.05) fluxes. Peak CH4 fluxes occurred just after heading and were greater (P < 0.05) from Roy J (7.9 mg CH4-C m -2 h -1) than from the three hybrid cultivars, which did not differ and averaged 5.1 mg CH4-C m -2 h -1. Seasonal CH4 emissions were greater (P < 0.05) from Roy J (74.8 kg CH4-C ha -1 season -1 ) than from CLXL729, XL753, and CLXL745, which did not differ, and averaged 55.3, 53.0, and 48.9 kg CH4-C ha -1 season -1, respectively. Results of this study indicate the use of common hybrid cultivars may have potential for mitigation of CH4 emissions from rice production on silt-loam soils in the mid-southern United States.Keywords: Methane emissions, rice cultivar, hybrid rice, methane mitigation IntroductionRice (Oryza sativa L.) is the world's only major row crop that substantially contributes to global methane (CH 4 ) emissions. While most crops are grown under aerated soil conditions and act as net sinks for atmospheric CH 4 , the majority of rice throughout the globe is produced in flooded fields [1] and acts as a net source of CH 4 into the atmosphere. The anoxic conditions resulting from flooded soils lead to the production and release of CH 4 , a greenhouse gas with a global warming potential (GWP) 25 times stronger than carbon dioxide (CO 2 ) [2]. Due to the production of CH 4 , rice cultivation has been estimated to have a GWP 2.7 and 5.7 times stronger than the production of maize (Zea mays L.) and wheat (Triticum aestivum L.), respectively, with 90% of the GWP of rice systems attributed to CH 4 [3,4]. It has been estimated, on a global scale, that approximately half of all anthropogenic CH 4 emissions to the atmosphere are a direct result of agricultural activities [5,6] and that 22% of those agricultural CH 4 emissions occur due to rice cultivation [7]. Arkansas is the leading rice-producing state in the US, representing over 49% of harvested area in 2014 and resulting in an estimated 39% of total CH 4 emissions from rice cultivation in the US in 2014 [8].Methane emissions from a rice cultivation system are governed by the magnitude and balance between the two microbial processes of methanogenesis, the prod...

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Section: Aboveground Dry Matter and Grain Yieldmentioning

confidence: 38%

Section: Methane Fluxes Following Flood Releasementioning

confidence: 67%

Section: Gas Sampling and Analysismentioning

confidence: 87%

Section: Gas Sampling and Analysismentioning

confidence: 99%

Section: Gas Sampling and Analysismentioning

confidence: 99%

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Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

A.D.¹,

K.R.²,

R.J.³

2018

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Water regime and fertilizer‐phosphorus source effects on greenhouse gas emissions from rice

Della Lunga,

Brye,

Roberts

et al. 2024

Agrosystems Geosci & Env

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Greenhouse gas (GHG) emissions from rice (Oryza sativa) systems have been correlated to water management practice, but to date, no study has directly evaluated three main GHGs (i.e., methane [CH4], nitrous oxide [N2O], and carbon dioxide [CO2]) under flood‐ and furrow‐irrigated conditions at the same time as affected by various fertilizer‐phosphorus (P) sources, in particular the reportedly slow‐release struvite‐P source. Therefore, the objective of this study was to evaluate the effect of water regime (flooded and furrow‐irrigated) and fertilizer‐P source (diammonium phosphate, chemically precipitated struvite, electrochemically precipitated struvite [ECST], triple superphosphate, and an unamended control) on GHG emissions and two‐ and three‐gas global warming potentials (GWP* and GWP, respectively) in the greenhouse. Methane emissions were 10 times greater (p < 0.05) under flooded (29.4 kg CH4 ha−1 season−1) than under furrow‐irrigated conditions (2.9 kg CH4 ha−1 season−1), and four times lower (p < 0.05) with ECST (3.4 kg CH4 ha−1 season−1) than other fertilizer‐P sources, while CO2 emissions were three times greater (p < 0.05) under furrow‐irrigated (23,428 kg CO2 ha−1 season−1) than under flooded (8290 kg CO2 ha−1 season−1) conditions. The GWP* under furrow‐irrigated conditions was almost 40% lower (p < 0.05) than under flooded conditions. Although N2O emissions were unaffected by fertilizer‐P source, the N2O contribution to GWP* was more than 80% under furrow‐irrigated conditions. Flood‐ and furrow‐irrigated water regimes require diversified approaches in GHG mitigation, where the best management for ECST needs to be more fully evaluated.

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Soil greenhouse gas emissions under enhanced efficiency and urea nitrogen fertilizer from Australian irrigated aerobic rice production

Webb,

Champness,

Hornbuckle

et al. 2024

Agrosystems Geosci & Env

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Aerobic rice production offers a promising solution to improve water use efficiency and reduce methane (CH4) emissions by minimizing water inundation. However, alternate water‐saving methods for rice cultivation can lead to “trade‐off” emissions of nitrous oxide (N2O). A field experiment was conducted over one season measuring soil‐derived greenhouse gas emissions in irrigated aerobic rice (Oryza sativa L.) under different N fertilizer management at a rate of 220 kg N ha−1, including a nil treatment (“control”); slow release (180 days) polymer‐coated urea (“N180”); banded urea applied upfront (“urea”); and three applications of broadcast urea (“urea‐split”). The N180 treatment reduced soil N2O emissions compared with urea (p < 0.001), with mean cumulative N2O emissions of 4.36 ± 1.07 kg N ha−1 and 27.9 ± 5.70 kg N ha−1, respectively. Soil N2O fluxes were high, reaching up to 1916 and 2900 µg N m2 h−1 after urea application and irrigation/rain events, and were similar to other irrigated crops grown on heavy textured soils. Fertilizer N management had no effect on soil CH4 emissions, which were negligible across all treatments ranging from 1.28 to 2.75 kg C ha−1 over the growing season. Cumulative soil carbon dioxide emissions ranged from 1936 to 3071 kg C ha−1 and were greatest in N180. This case study provides the first evidence in Australia that enhanced efficiency nitrogen fertilizer can substantially reduce N2O emissions from soils in an aerobic rice system. Our findings reinforce the CH4 mitigation potential of water saving rice approaches and demonstrate the need to consider N fertilizer management to control N2O emissions.

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Soil Texture Effects on Methane Emissions From Direct-Seeded, Delayed-Flood Rice Production in Arkansas

Cited by 43 publications

References 7 publications

Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

Methane Emissions among Hybrid Rice Cultivars in the MidSouthern United States

Water regime and fertilizer‐phosphorus source effects on greenhouse gas emissions from rice

Soil greenhouse gas emissions under enhanced efficiency and urea nitrogen fertilizer from Australian irrigated aerobic rice production

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